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• Logic error for Gauss elimination

  - by iwanttoprogram

  Logic error problem with the Gaussian Elimination code...This code was from my Numerical Methods text in 1990's. The code is typed in from the book- not producing correct output... Sample Run: SOLUTION OF SIMULTANEOUS LINEAR EQUATIONS USING GAUSSIAN ELIMINATION This program uses Gaussian Elimination to solve the system Ax = B, where A is the matrix of known coefficients, B is the vector of known constants and x is the column matrix of the unknowns. Number of equations: 3 Enter elements of matrix [A] A(1,1) = 0 A(1,2) = -6 A(1,3) = 9 A(2,1) = 7 A(2,2) = 0 A(2,3) = -5 A(3,1) = 5 A(3,2) = -8 A(3,3) = 6 Enter elements of [b] vector B(1) = -3 B(2) = 3 B(3) = -4 SOLUTION OF SIMULTANEOUS LINEAR EQUATIONS The solution is x(1) = 0.000000 x(2) = -1.#IND00 x(3) = -1.#IND00 Determinant = -1.#IND00 Press any key to continue . . . The code as copied from the text... //Modified Code from C Numerical Methods Text- June 2009 #include <stdio.h> #include <math.h> #define MAXSIZE 20 //function prototype int gauss (double a[][MAXSIZE], double b[], int n, double *det); int main(void) { double a[MAXSIZE][MAXSIZE], b[MAXSIZE], det; int i, j, n, retval; printf("\n \t SOLUTION OF SIMULTANEOUS LINEAR EQUATIONS"); printf("\n \t USING GAUSSIAN ELIMINATION \n"); printf("\n This program uses Gaussian Elimination to solve the"); printf("\n system Ax = B, where A is the matrix of known"); printf("\n coefficients, B is the vector of known constants"); printf("\n and x is the column matrix of the unknowns."); //get number of equations n = 0; while(n <= 0 || n > MAXSIZE) { printf("\n Number of equations: "); scanf ("%d", &n); } //read matrix A printf("\n Enter elements of matrix [A]\n"); for (i = 0; i < n; i++) for (j = 0; j < n; j++) { printf(" A(%d,%d) = ", i + 1, j + 1); scanf("%lf", &a[i][j]); } //read {B} vector printf("\n Enter elements of [b] vector\n"); for (i = 0; i < n; i++) { printf(" B(%d) = ", i + 1); scanf("%lf", &b[i]); } //call Gauss elimination function retval = gauss(a, b, n, &det); //print results if (retval == 0) { printf("\n\t SOLUTION OF SIMULTANEOUS LINEAR EQUATIONS\n"); printf("\n\t The solution is"); for (i = 0; i < n; i++) printf("\n \t x(%d) = %lf", i + 1, b[i]); printf("\n \t Determinant = %lf \n", det); } else printf("\n \t SINGULAR MATRIX \n"); return 0; } /* Solves the system of equations [A]{x} = {B} using */ /* the Gaussian elimination method with partial pivoting. */ /* Parameters: */ /* n - number of equations */ /* a[n][n] - coefficient matrix */ /* b[n] - right-hand side vector */ /* *det - determinant of [A] */ int gauss (double a[][MAXSIZE], double b[], int n, double *det) { double tol, temp, mult; int npivot, i, j, l, k, flag; //initialization *det = 1.0; tol = 1e-30; //initial tolerance value npivot = 0; //mult = 0; //forward elimination for (k = 0; k < n; k++) { //search for max coefficient in pivot row- a[k][k] pivot element for (i = k + 1; i < n; i++) { if (fabs(a[i][k]) > fabs(a[k][k])) { //interchange row with maxium element with pivot row npivot++; for (l = 0; l < n; l++) { temp = a[i][l]; a[i][l] = a[k][l]; a[k][l] = temp; } temp = b[i]; b[i] = b[k]; b[k] = temp; } } //test for singularity if (fabs(a[k][k]) < tol) { //matrix is singular- terminate flag = 1; return flag; } //compute determinant- the product of the pivot elements *det = *det * a[k][k]; //eliminate the coefficients of X(I) for (i = k; i < n; i++) { mult = a[i][k] / a[k][k]; b[i] = b[i] - b[k] * mult; //compute constants for (j = k; j < n; j++) //compute coefficients a[i][j] = a[i][j] - a[k][j] * mult; } } //adjust the sign of the determinant if(npivot % 2 == 1) *det = *det * (-1.0); //backsubstitution b[n] = b[n] / a[n][n]; for(i = n - 1; i > 1; i--) { for(j = n; j > i + 1; j--) b[i] = b[i] - a[i][j] * b[j]; b[i] = b[i] / a[i - 1][i]; } flag = 0; return flag; } The solution should be: 1.058824, 1.823529, 0.882353 with det as -102.000000 Any insight is appreciated...

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• Linux Virtualization Options on EC2

  - by recampbell

  I need to subdivide EC2 (or perhaps other cloud provider) instances. I know you cannot run a full virtualization stack on another. For instance a Xen guest cannot host a VirtualBox guest. So this means I am left with operating system-level virtualization. EC2 kernels are only publishable by select vendors, so you cannot upload the custom kernels required for OpenVZ or Vserver. For Linux, I think this leaves me with lxc (on Ubuntu 9.10), User Mode Linux, or qemu. I'm having a hard time finding comparisons between them. Performance is a concern, as is the ability to provide SMP to the guests. I would also like to use COW/sparse roots to reduce guest provisioning. My question is, what are the trade-offs between these options?

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• OSX 10.6 Cisco IPSEC strange behavior

  - by tair

  I'm trying to connect to Cisco IPSEC VPN of my company over DSL Internet. I managed to successfully connect using Cisco VPN Client, now I'm trying to switch to OSX 10.6 native client, because of licensing issues. The problems is that the connection fails with a dialog box containing the message: The negotiation with the VPN server failed. Verify the server address and try reconnecting. I checked logs: Jun 29 13:10:39 racoon[4551]: Connecting. Jun 29 13:10:39 racoon[4551]: IKE Packet: transmit success. (Initiator, Aggressive-Mode message 1). Jun 29 13:10:39 racoon[4551]: IKEv1 Phase1 AUTH: success. (Initiator, Aggressive-Mode Message 2). Jun 29 13:10:39 racoon[4551]: IKE Packet: receive success. (Initiator, Aggressive-Mode message 2). Jun 29 13:10:39 racoon[4551]: IKEv1 Phase1 Initiator: success. (Initiator, Aggressive-Mode). Jun 29 13:10:39 racoon[4551]: IKE Packet: transmit success. (Initiator, Aggressive-Mode message 3). Jun 29 13:10:42 racoon[4551]: IKE Packet: transmit success. (Mode-Config message). Jun 29 13:10:42 racoon[4551]: IKEv1 XAUTH: success. (XAUTH Status is OK). Jun 29 13:10:42 racoon[4551]: IKE Packet: transmit success. (Mode-Config message). Jun 29 13:10:42 racoon[4551]: IKEv1 Config: retransmited. (Mode-Config retransmit). Jun 29 13:10:42 racoon[4551]: IKE Packet: receive success. (MODE-Config). Jun 29 13:10:42 configd[19]: event_callback: Address added. previous interface setting (name: en1, address: 192.168.1.107), current interface setting (name: u92.168.54.147, subnet: 255.255.255.0, destination: 192.168.54.147). Jun 29 13:10:42 configd[19]: network configuration changed. Jun 29 13:10:42 vmnet-bridge[111]: Dynamic store changed Jun 29 13:10:42 named[62]: not listening on any interfaces Jun 29 13:10:58: --- last message repeated 1 time --- Jun 29 13:10:58 configd[19]: SCNCController: Disconnecting. (Connection tried to negotiate for, 16 seconds). Jun 29 13:10:58 racoon[4551]: IKE Packet: transmit success. (Information message). Jun 29 13:10:58 racoon[4551]: IKEv1 Information-Notice: transmit success. (Delete ISAKMP-SA). Jun 29 13:10:58 racoon[4551]: Disconnecting. (Connection tried to negotiate for, 19.113382 seconds). Jun 29 13:10:58 named[62]: not listening on any interfaces Jun 29 13:10:58 vmnet-bridge[111]: Dynamic store changed Jun 29 13:10:58 named[62]: not listening on any interfaces Jun 29 13:10:58 configd[19]: network configuration changed. Then I opened Terminal, started pinging a server behind VPN, and tried to connect again. Now connection is OK! Logs this time: Jun 29 13:46:53 racoon[8136]: Connecting. Jun 29 13:46:53 racoon[8136]: IKE Packet: transmit success. (Initiator, Aggressive-Mode message 1). Jun 29 13:46:53 racoon[8136]: IKEv1 Phase1 AUTH: success. (Initiator, Aggressive-Mode Message 2). Jun 29 13:46:53 racoon[8136]: IKE Packet: receive success. (Initiator, Aggressive-Mode message 2). Jun 29 13:46:53 racoon[8136]: IKEv1 Phase1 Initiator: success. (Initiator, Aggressive-Mode). Jun 29 13:46:53 racoon[8136]: IKE Packet: transmit success. (Initiator, Aggressive-Mode message 3). Jun 29 13:46:56 racoon[8136]: IKE Packet: transmit success. (Mode-Config message). Jun 29 13:46:56 racoon[8136]: IKEv1 XAUTH: success. (XAUTH Status is OK). Jun 29 13:46:56 racoon[8136]: IKE Packet: transmit success. (Mode-Config message). Jun 29 13:46:56 racoon[8136]: IKEv1 Config: retransmited. (Mode-Config retransmit). Jun 29 13:46:56 racoon[8136]: IKE Packet: receive success. (MODE-Config). Jun 29 13:46:56 configd[19]: event_callback: Address added. previous interface setting (name: en1, address: 192.168.1.107), current interface settinaddress: 192.168.54.149, subnet: 255.255.255.0, destination: 192.168.54.149). Jun 29 13:46:56 vmnet-bridge[111]: Dynamic store changed Jun 29 13:46:56 named[62]: not listening on any interfaces Jun 29 13:46:56 configd[19]: network configuration changed. Jun 29 13:46:56 named[62]: not listening on any interfaces Jun 29 13:46:56 racoon[8136]: IKE Packet: transmit success. (Initiator, Quick-Mode message 1). Jun 29 13:46:56 racoon[8136]: IKE Packet: receive success. (Initiator, Quick-Mode message 2). Jun 29 13:46:56 racoon[8136]: IKE Packet: transmit success. (Initiator, Quick-Mode message 3). Jun 29 13:46:56 racoon[8136]: IKEv1 Phase2 Initiator: success. (Initiator, Quick-Mode). Jun 29 13:46:56 racoon[8136]: Connected. Jun 29 13:46:56 configd[19]: SCNCController: Connected. I tested it several times and it consistently behaves the same. What is the magic?

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• OSX 10.6 Cisco IPSEC strange behavior

  - by tair

  I'm trying to connect to Cisco IPSEC VPN of my company over DSL Internet. I managed to successfully connect using Cisco VPN Client, now I'm trying to switch to OSX 10.6 native client, because of licensing issues. The problems is that the connection fails with a dialog box containing the message: The negotiation with the VPN server failed. Verify the server address and try reconnecting. I checked logs: Jun 29 13:10:39 racoon[4551]: Connecting. Jun 29 13:10:39 racoon[4551]: IKE Packet: transmit success. (Initiator, Aggressive-Mode message 1). Jun 29 13:10:39 racoon[4551]: IKEv1 Phase1 AUTH: success. (Initiator, Aggressive-Mode Message 2). Jun 29 13:10:39 racoon[4551]: IKE Packet: receive success. (Initiator, Aggressive-Mode message 2). Jun 29 13:10:39 racoon[4551]: IKEv1 Phase1 Initiator: success. (Initiator, Aggressive-Mode). Jun 29 13:10:39 racoon[4551]: IKE Packet: transmit success. (Initiator, Aggressive-Mode message 3). Jun 29 13:10:42 racoon[4551]: IKE Packet: transmit success. (Mode-Config message). Jun 29 13:10:42 racoon[4551]: IKEv1 XAUTH: success. (XAUTH Status is OK). Jun 29 13:10:42 racoon[4551]: IKE Packet: transmit success. (Mode-Config message). Jun 29 13:10:42 racoon[4551]: IKEv1 Config: retransmited. (Mode-Config retransmit). Jun 29 13:10:42 racoon[4551]: IKE Packet: receive success. (MODE-Config). Jun 29 13:10:42 configd[19]: event_callback: Address added. previous interface setting (name: en1, address: 192.168.1.107), current interface setting (name: u92.168.54.147, subnet: 255.255.255.0, destination: 192.168.54.147). Jun 29 13:10:42 configd[19]: network configuration changed. Jun 29 13:10:42 vmnet-bridge[111]: Dynamic store changed Jun 29 13:10:42 named[62]: not listening on any interfaces Jun 29 13:10:58: --- last message repeated 1 time --- Jun 29 13:10:58 configd[19]: SCNCController: Disconnecting. (Connection tried to negotiate for, 16 seconds). Jun 29 13:10:58 racoon[4551]: IKE Packet: transmit success. (Information message). Jun 29 13:10:58 racoon[4551]: IKEv1 Information-Notice: transmit success. (Delete ISAKMP-SA). Jun 29 13:10:58 racoon[4551]: Disconnecting. (Connection tried to negotiate for, 19.113382 seconds). Jun 29 13:10:58 named[62]: not listening on any interfaces Jun 29 13:10:58 vmnet-bridge[111]: Dynamic store changed Jun 29 13:10:58 named[62]: not listening on any interfaces Jun 29 13:10:58 configd[19]: network configuration changed. Then I opened Terminal, started pinging a server behind VPN, and tried to connect again. Now connection is OK! Logs this time: Jun 29 13:46:53 racoon[8136]: Connecting. Jun 29 13:46:53 racoon[8136]: IKE Packet: transmit success. (Initiator, Aggressive-Mode message 1). Jun 29 13:46:53 racoon[8136]: IKEv1 Phase1 AUTH: success. (Initiator, Aggressive-Mode Message 2). Jun 29 13:46:53 racoon[8136]: IKE Packet: receive success. (Initiator, Aggressive-Mode message 2). Jun 29 13:46:53 racoon[8136]: IKEv1 Phase1 Initiator: success. (Initiator, Aggressive-Mode). Jun 29 13:46:53 racoon[8136]: IKE Packet: transmit success. (Initiator, Aggressive-Mode message 3). Jun 29 13:46:56 racoon[8136]: IKE Packet: transmit success. (Mode-Config message). Jun 29 13:46:56 racoon[8136]: IKEv1 XAUTH: success. (XAUTH Status is OK). Jun 29 13:46:56 racoon[8136]: IKE Packet: transmit success. (Mode-Config message). Jun 29 13:46:56 racoon[8136]: IKEv1 Config: retransmited. (Mode-Config retransmit). Jun 29 13:46:56 racoon[8136]: IKE Packet: receive success. (MODE-Config). Jun 29 13:46:56 configd[19]: event_callback: Address added. previous interface setting (name: en1, address: 192.168.1.107), current interface settinaddress: 192.168.54.149, subnet: 255.255.255.0, destination: 192.168.54.149). Jun 29 13:46:56 vmnet-bridge[111]: Dynamic store changed Jun 29 13:46:56 named[62]: not listening on any interfaces Jun 29 13:46:56 configd[19]: network configuration changed. Jun 29 13:46:56 named[62]: not listening on any interfaces Jun 29 13:46:56 racoon[8136]: IKE Packet: transmit success. (Initiator, Quick-Mode message 1). Jun 29 13:46:56 racoon[8136]: IKE Packet: receive success. (Initiator, Quick-Mode message 2). Jun 29 13:46:56 racoon[8136]: IKE Packet: transmit success. (Initiator, Quick-Mode message 3). Jun 29 13:46:56 racoon[8136]: IKEv1 Phase2 Initiator: success. (Initiator, Quick-Mode). Jun 29 13:46:56 racoon[8136]: Connected. Jun 29 13:46:56 configd[19]: SCNCController: Connected. I tested it several times and it consistently behaves the same. What is the magic?

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• Unpredictable MBP wake from sleep in Windows 7 Boot Camp

  - by qntmfred

  I have a Macbook Pro with Windows 7 installed in Boot Camp. I have serious problems with waking from sleep and not sure why. I have the default Balanced power plan selected. Many times when I close the laptop and leave it for more than just a few minutes, when I open it back up, it does not awake immediately. I often end up having to press the power button just to get it to wake up. Sometimes this causes it to wake up in Windows mode, sometimes it reboots completely, sometimes the battery has been drained and Windows has to restart (and gives me the Windows did not shut down properly message). Is this a common problem with Boot Camp? Can I fix it?

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• How to install on Windows Server 2008, an application that is not natively supported, but not use co

  - by t3

  I have an application to install on Windows Server 2008, which is not natively supported by the installer. The application installer permits installation on Windows Vista(or XP, or 7). I do not want to use compatibility mode; even if I did it doesn't work. So, how can I spoof the installer to believe it is Windows Vista(or XP, or 7) so that it can proceed with the installation? Notes: This is an experimental machine, so I am not concerned about stability of the host or the application.

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• Removing a malware that sets up as a system driver

  - by ereOn

  Hello, I recently tried to fix up my mother's computer which has some serious malwares. One of them apparently registered itself as system driver (tjbijkoq.sys if that can help) and after running a malware suppression tool, the computer won't boot anymore, complaining about a "critical driver that is missing". I think deleting the matching entry in the registry would just solve the problem, but obviously I can't boot up the computer (even in safe mode) to fix it. Do you guys have any experience with such an issue and how to solve this ? Thank you very much. The operating system is Windows Vista 32 bits Professional

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• Is there a way to pin a virtual PC VHD to the Windows 7 taskbar?

  - by Corey

  I have a virtual HD for Windows XP mode, and wanted to pin it to the task bar. However, trying to pin the shortcut to the VHD file actually pins the "virtual machines" folder instead. Clicking on it opens the explorer window and I have to click on the VHD to actually open Windows XP. It does know I'm trying to pin the file, and if I right-click the taskbar icon, has the file under "pinned," but the default action is what's under "Task" (which is to open the virtual machines folder in explorer). Is there a way to pin the actual VHD to the taskbar, so it's just one click to restore the virtual machine?

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• BBDB/OrgMode Workflow to store additional information

  - by Matth

  What is the best strategy to establish links and reverse links to my contacts stored in BBDB? My Outline is similar to this: * Projects ** a ** b -> link to contact? ** c * Notes ** 2014-04-02 Meeting with Contact A -> link to contact? How can I create a workflow so that all references to this contact are shown, once I open this contact in BBDB? Currently I use a "hack" where I manually enter links to the entries in the "Notes" field of that entry. But as it is not possible to inclide org-mode outlines in the "Notes" filed, it is an appalling list unusable links.

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• no namenode error in pseudo-mode

  - by Anshu Basia

  I'm new to hadoop and is in learning phase. As per Hadoop Definitve guide, i have set up my hadoop in pseudo distributed mode and everything was working fine. I was even able to execute all the examples from chapter 3 yesterday. Today, when i rebooted my unix and tried to run start-dfs.sh and then tried http://localhost/50070....it is showing error and when i try to stop dfs (stop-dfs.sh) it says no namenode to stop. I have been googling the issue but no result. Also, when i format my namenode again...everything starts working fine and i'm able to connect to the localhost/50070 and even replicate files and directories in hdfs but as soon as i restart my linux and try to connect to hdfs the same problem comes up. Below is the error log: ************************************************************/ 2011-06-22 15:45:55,249 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: STARTUP_MSG: /************************************************************ STARTUP_MSG: Starting NameNode STARTUP_MSG: host = ubuntu/127.0.1.1 STARTUP_MSG: args = [] STARTUP_MSG: version = 0.20.203.0 STARTUP_MSG: build = http://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20-security-203 -r 1099333; compiled by 'oom' on Wed May 4 07:57:50 PDT 2011 ************************************************************/ 2011-06-22 15:45:56,383 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties 2011-06-22 15:45:56,455 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered. 2011-06-22 15:45:56,494 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s). 2011-06-22 15:45:56,494 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system started 2011-06-22 15:45:57,007 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi registered. 2011-06-22 15:45:57,031 WARN org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Source name ugi already exists! 2011-06-22 15:45:57,059 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source jvm registered. 2011-06-22 15:45:57,070 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source NameNode registered. 2011-06-22 15:45:57,374 INFO org.apache.hadoop.hdfs.util.GSet: VM type = 32-bit 2011-06-22 15:45:57,374 INFO org.apache.hadoop.hdfs.util.GSet: 2% max memory = 19.33375 MB 2011-06-22 15:45:57,374 INFO org.apache.hadoop.hdfs.util.GSet: capacity = 2^22 = 4194304 entries 2011-06-22 15:45:57,374 INFO org.apache.hadoop.hdfs.util.GSet: recommended=4194304, actual=4194304 2011-06-22 15:45:57,854 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: fsOwner=anshu 2011-06-22 15:45:57,854 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: supergroup=supergroup 2011-06-22 15:45:57,854 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: isPermissionEnabled=true 2011-06-22 15:45:57,868 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: dfs.block.invalidate.limit=100 2011-06-22 15:45:57,869 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s) 2011-06-22 15:45:58,769 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Registered FSNamesystemStateMBean and NameNodeMXBean 2011-06-22 15:45:58,809 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: Caching file names occuring more than 10 times **2011-06-22 15:45:58,825 INFO org.apache.hadoop.hdfs.server.common.Storage: Storage directory /tmp/hadoop-anshu/dfs/name does not exist. 2011-06-22 15:45:58,827 ERROR org.apache.hadoop.hdfs.server.namenode.FSNamesystem: FSNamesystem initialization failed. org.apache.hadoop.hdfs.server.common.InconsistentFSStateException: Directory /tmp/hadoop-anshu/dfs/name is in an inconsistent state: storage directory does not exist or is not accessible. at org.apache.h**adoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:291) at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:97) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:379) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:353) at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:254) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:434) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1153) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1162) 2011-06-22 15:45:58,828 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: org.apache.hadoop.hdfs.server.common.InconsistentFSStateException: Directory /tmp/hadoop-anshu/dfs/name is in an inconsistent state: storage directory does not exist or is not accessible. at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:291) at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:97) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:379) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:353) at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:254) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:434) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1153) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1162) 2011-06-22 15:45:58,829 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG: /************************************************************ SHUTDOWN_MSG: Shutting down NameNode at ubuntu/127.0.1.1 ************************************************************/ Any help is appreciated Thank-you

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• Thinking Sphinx not working in test mode

  - by J. Pablo Fernández

  I'm trying to get Thinking Sphinx to work in test mode in Rails. Basically this: ThinkingSphinx::Test.init ThinkingSphinx::Test.start freezes and never comes back. My test and devel configuration is the same for test and devel: dry_setting: &dry_setting adapter: mysql host: localhost encoding: utf8 username: rails password: blahblah development: <<: *dry_setting database: proj_devel socket: /tmp/mysql.sock # sphinx requires it test: <<: *dry_setting database: proj_test socket: /tmp/mysql.sock # sphinx requires it and sphinx.yml development: enable_star: 1 min_infix_len: 2 bin_path: /opt/local/bin test: enable_star: 1 min_infix_len: 2 bin_path: /opt/local/bin production: enable_star: 1 min_infix_len: 2 The generated config files, config/development.sphinx.conf and config/test.sphinx.conf only differ in database names, directories and similar things; nothing functional. Generating the index for devel goes without an issue $ rake ts:in (in /Users/pupeno/proj) default config Generating Configuration to /Users/pupeno/proj/config/development.sphinx.conf Sphinx 0.9.8.1-release (r1533) Copyright (c) 2001-2008, Andrew Aksyonoff using config file '/Users/pupeno/proj/config/development.sphinx.conf'... indexing index 'user_core'... collected 7 docs, 0.0 MB collected 0 attr values sorted 0.0 Mvalues, 100.0% done sorted 0.0 Mhits, 99.8% done total 7 docs, 422 bytes total 0.098 sec, 4320.80 bytes/sec, 71.67 docs/sec indexing index 'user_delta'... collected 0 docs, 0.0 MB collected 0 attr values sorted 0.0 Mvalues, nan% done total 0 docs, 0 bytes total 0.010 sec, 0.00 bytes/sec, 0.00 docs/sec distributed index 'user' can not be directly indexed; skipping. but when I try to do it for test it freezes: $ RAILS_ENV=test rake ts:in (in /Users/pupeno/proj) DEPRECATION WARNING: require "activeresource" is deprecated and will be removed in Rails 3. Use require "active_resource" instead.. (called from /Users/pupeno/.rvm/gems/ruby-1.8.7-p249/gems/activeresource-2.3.5/lib/activeresource.rb:2) default config Generating Configuration to /Users/pupeno/proj/config/test.sphinx.conf Sphinx 0.9.8.1-release (r1533) Copyright (c) 2001-2008, Andrew Aksyonoff using config file '/Users/pupeno/proj/config/test.sphinx.conf'... indexing index 'user_core'... It's been there for more than 10 minutes, the user table has 4 records. The database directory look quite diferently, but I don't know what to make of it: $ ls -l db/sphinx/development/ total 96 -rw-r--r-- 1 pupeno staff 196 Mar 11 18:10 user_core.spa -rw-r--r-- 1 pupeno staff 4982 Mar 11 18:10 user_core.spd -rw-r--r-- 1 pupeno staff 417 Mar 11 18:10 user_core.sph -rw-r--r-- 1 pupeno staff 3067 Mar 11 18:10 user_core.spi -rw-r--r-- 1 pupeno staff 84 Mar 11 18:10 user_core.spm -rw-r--r-- 1 pupeno staff 6832 Mar 11 18:10 user_core.spp -rw-r--r-- 1 pupeno staff 0 Mar 11 18:10 user_delta.spa -rw-r--r-- 1 pupeno staff 1 Mar 11 18:10 user_delta.spd -rw-r--r-- 1 pupeno staff 417 Mar 11 18:10 user_delta.sph -rw-r--r-- 1 pupeno staff 1 Mar 11 18:10 user_delta.spi -rw-r--r-- 1 pupeno staff 0 Mar 11 18:10 user_delta.spm -rw-r--r-- 1 pupeno staff 1 Mar 11 18:10 user_delta.spp $ ls -l db/sphinx/test/ total 0 -rw-r--r-- 1 pupeno staff 0 Mar 11 18:11 user_core.spl -rw-r--r-- 1 pupeno staff 0 Mar 11 18:11 user_core.tmp0 -rw-r--r-- 1 pupeno staff 0 Mar 11 18:11 user_core.tmp1 -rw-r--r-- 1 pupeno staff 0 Mar 11 18:11 user_core.tmp2 -rw-r--r-- 1 pupeno staff 0 Mar 11 18:11 user_core.tmp7 Nothing gets added to a log when this happens. Any ideas where to go from here? I can run the command line manually: /opt/local/bin/indexer --config config/test.sphinx.conf --all which generates the output as the rake ts:in, so no help there.

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• What statistics can be maintained for a set of numerical data without iterating?

  - by Dan Tao

  Update Just for future reference, I'm going to list all of the statistics that I'm aware of that can be maintained in a rolling collection, recalculated as an O(1) operation on every addition/removal (this is really how I should've worded the question from the beginning): Obvious Count Sum Mean Max* Min* Median** Less Obvious Variance Standard Deviation Skewness Kurtosis Mode*** Weighted Average Weighted Moving Average**** OK, so to put it more accurately: these are not "all" of the statistics I'm aware of. They're just the ones that I can remember off the top of my head right now. *Can be recalculated in O(1) for additions only, or for additions and removals if the collection is sorted (but in this case, insertion is not O(1)). Removals potentially incur an O(n) recalculation for non-sorted collections. **Recalculated in O(1) for a sorted, indexed collection only. ***Requires a fairly complex data structure to recalculate in O(1). ****This can certainly be achieved in O(1) for additions and removals when the weights are assigned in a linearly descending fashion. In other scenarios, I'm not sure. Original Question Say I maintain a collection of numerical data -- let's say, just a bunch of numbers. For this data, there are loads of calculated values that might be of interest; one example would be the sum. To get the sum of all this data, I could... Option 1: Iterate through the collection, adding all the values: double sum = 0.0; for (int i = 0; i < values.Count; i++) sum += values[i]; Option 2: Maintain the sum, eliminating the need to ever iterate over the collection just to find the sum: void Add(double value) { values.Add(value); sum += value; } void Remove(double value) { values.Remove(value); sum -= value; } EDIT: To put this question in more relatable terms, let's compare the two options above to a (sort of) real-world situation: Suppose I start listing numbers out loud and ask you to keep them in your head. I start by saying, "11, 16, 13, 12." If you've just been remembering the numbers themselves and nothing more, and then I say, "What's the sum?", you'd have to think to yourself, "OK, what's 11 + 16 + 13 + 12?" before responding, "52." If, on the other hand, you had been keeping track of the sum yourself while I was listing the numbers (i.e., when I said, "11" you thought "11", when I said "16", you thought, "27," and so on), you could answer "52" right away. Then if I say, "OK, now forget the number 16," if you've been keeping track of the sum inside your head you can simply take 16 away from 52 and know that the new sum is 36, rather than taking 16 off the list and them summing up 11 + 13 + 12. So my question is, what other calculations, other than the obvious ones like sum and average, are like this? SECOND EDIT: As an arbitrary example of a statistic that (I'm almost certain) does require iteration -- and therefore cannot be maintained as simply as a sum or average -- consider if I asked you, "how many numbers in this collection are divisible by the min?" Let's say the numbers are 5, 15, 19, 20, 21, 25, and 30. The min of this set is 5, which divides into 5, 15, 20, 25, and 30 (but not 19 or 21), so the answer is 5. Now if I remove 5 from the collection and ask the same question, the answer is now 2, since only 15 and 30 are divisible by the new min of 15; but, as far as I can tell, you cannot know this without going through the collection again. So I think this gets to the heart of my question: if we can divide kinds of statistics into these categories, those that are maintainable (my own term, maybe there's a more official one somewhere) versus those that require iteration to compute any time a collection is changed, what are all the maintainable ones? What I am asking about is not strictly the same as an online algorithm (though I sincerely thank those of you who introduced me to that concept). An online algorithm can begin its work without having even seen all of the input data; the maintainable statistics I am seeking will certainly have seen all the data, they just don't need to reiterate through it over and over again whenever it changes.

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• StackOverflowException throws often when .net application built with Debug mode

  - by user1487950

  I have an application which access an external webservice often, when i are trying to debug it, means debuging in vistual studio. it often throws out StackOverflowException at the webserverice call point. when building in Release mode , the exception thrown out only occasionally. I checked the call stack, looks like there is no recursive call. can you please suggest? thank you very much. call statck attached. [In a sleep, wait, or join] mscorlib.dll!System.Threading.WaitHandle.InternalWaitOne(System.Runtime.InteropServices.SafeHandle waitableSafeHandle, long millisecondsTimeout, bool hasThreadAffinity, bool exitContext) + 0x2b bytes mscorlib.dll!System.Threading.WaitHandle.WaitOne(int millisecondsTimeout, bool exitContext) + 0x2d bytes System.dll!System.Net.NetworkAddressChangePolled.CheckAndReset() + 0x9d bytes System.dll!System.Net.NclUtilities.LocalAddresses.get() + 0x49 bytes System.dll!System.Net.WebProxyScriptHelper.myIpAddress() + 0x27 bytes [Native to Managed Transition] System.dll!System.Net.WebProxyScriptHelper.MyMethodInfo.Invoke(object target, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, object[] args, System.Globalization.CultureInfo culture) + 0x6b bytes MTOqoHCT.dll!JScript 0.myIpAddress(object this, Microsoft.JScript.Vsa.VsaEngine vsa Engine, object arguments) + 0x91 bytes MTOqoHCT.dll!JScript 0.FindProxyForURL(object this, Microsoft.JScript.Vsa.VsaEngine vsa Engine, object arguments, object url, object host) + 0x3c6e bytes MTOqoHCT.dll!__WebProxyScript.__WebProxyScript.ExecuteFindProxyForURL(object url, object host) + 0x11d bytes [Native to Managed Transition] Microsoft.JScript.dll!System.Net.VsaWebProxyScript.CallMethod(object targetObject, string name, object[] args) + 0x11a bytes Microsoft.JScript.dll!System.Net.VsaWebProxyScript.Run(string url, string host) + 0x74 bytes [Native to Managed Transition] [Managed to Native Transition] mscorlib.dll!System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(System.Runtime.Remoting.Messaging.IMessage msg, int methodPtr, bool fExecuteInContext) + 0x1ef bytes mscorlib.dll!System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(System.Runtime.Remoting.Messaging.IMessage msg) + 0xf bytes mscorlib.dll!System.Runtime.Remoting.Messaging.ServerObjectTerminatorSink.SyncProcessMessage(System.Runtime.Remoting.Messaging.IMessage reqMsg) + 0x66 bytes mscorlib.dll!System.Runtime.Remoting.Messaging.ServerContextTerminatorSink.SyncProcessMessage(System.Runtime.Remoting.Messaging.IMessage reqMsg) + 0x8a bytes mscorlib.dll!System.Runtime.Remoting.Channels.CrossContextChannel.SyncProcessMessageCallback(object[] args) + 0x94 bytes mscorlib.dll!System.Threading.Thread.CompleteCrossContextCallback(System.Threading.InternalCrossContextDelegate ftnToCall, object[] args) + 0x8 bytes [Native to Managed Transition] [Managed to Native Transition] mscorlib.dll!System.Runtime.Remoting.Channels.CrossContextChannel.SyncProcessMessage(System.Runtime.Remoting.Messaging.IMessage reqMsg) + 0xa7 bytes mscorlib.dll!System.Runtime.Remoting.Channels.ChannelServices.SyncDispatchMessage(System.Runtime.Remoting.Messaging.IMessage msg) + 0x92 bytes mscorlib.dll!System.Runtime.Remoting.Channels.CrossAppDomainSink.DoDispatch(byte[] reqStmBuff, System.Runtime.Remoting.Messaging.SmuggledMethodCallMessage smuggledMcm, out System.Runtime.Remoting.Messaging.SmuggledMethodReturnMessage smuggledMrm) + 0xed bytes mscorlib.dll!System.Runtime.Remoting.Channels.CrossAppDomainSink.DoTransitionDispatchCallback(object[] args) + 0x8a bytes mscorlib.dll!System.Threading.Thread.CompleteCrossContextCallback(System.Threading.InternalCrossContextDelegate ftnToCall, object[] args) + 0x8 bytes [Appdomain Transition] mscorlib.dll!System.Runtime.Remoting.Channels.CrossAppDomainSink.DoTransitionDispatch(byte[] reqStmBuff, System.Runtime.Remoting.Messaging.SmuggledMethodCallMessage smuggledMcm, out System.Runtime.Remoting.Messaging.SmuggledMethodReturnMessage smuggledMrm) + 0x74 bytes mscorlib.dll!System.Runtime.Remoting.Channels.CrossAppDomainSink.SyncProcessMessage(System.Runtime.Remoting.Messaging.IMessage reqMsg) + 0xa3 bytes mscorlib.dll!System.Runtime.Remoting.Proxies.RemotingProxy.CallProcessMessage(System.Runtime.Remoting.Messaging.IMessageSink ms, System.Runtime.Remoting.Messaging.IMessage reqMsg, System.Runtime.Remoting.Contexts.ArrayWithSize proxySinks, System.Threading.Thread currentThread, System.Runtime.Remoting.Contexts.Context currentContext, bool bSkippingContextChain) + 0x50 bytes mscorlib.dll!System.Runtime.Remoting.Proxies.RemotingProxy.InternalInvoke(System.Runtime.Remoting.Messaging.IMethodCallMessage reqMcmMsg, bool useDispatchMessage, int callType) + 0x1d5 bytes mscorlib.dll!System.Runtime.Remoting.Proxies.RemotingProxy.Invoke(System.Runtime.Remoting.Messaging.IMessage reqMsg) + 0x66 bytes mscorlib.dll!System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(ref System.Runtime.Remoting.Proxies.MessageData msgData, int type) + 0xee bytes System.dll!System.Net.NetWebProxyFinder.GetProxies(System.Uri destination, out System.Collections.Generic.IList<string> proxyList) + 0x83 bytes System.dll!System.Net.AutoWebProxyScriptEngine.GetProxies(System.Uri destination, out System.Collections.Generic.IList<string> proxyList, ref int syncStatus) + 0x84 bytes System.dll!System.Net.WebProxy.GetProxiesAuto(System.Uri destination, ref int syncStatus) + 0x2e bytes System.dll!System.Net.ProxyScriptChain.GetNextProxy(out System.Uri proxy) + 0x2e bytes System.dll!System.Net.ProxyChain.ProxyEnumerator.MoveNext() + 0x98 bytes System.dll!System.Net.ServicePointManager.FindServicePoint(System.Uri address, System.Net.IWebProxy proxy, out System.Net.ProxyChain chain, ref System.Net.HttpAbortDelegate abortDelegate, ref int abortState) + 0x120 bytes System.dll!System.Net.HttpWebRequest.FindServicePoint(bool forceFind) + 0xb1 bytes System.dll!System.Net.HttpWebRequest.GetRequestStream(out System.Net.TransportContext context) + 0x247 bytes System.dll!System.Net.HttpWebRequest.GetRequestStream() + 0xe bytes System.Web.Services.dll!System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(string methodName, object[] parameters) + 0xc0 bytes Gfinet.Config.dll!Gfinet.Config.Service.cfg_webservice.addOrUpdateProperties(string string, int intVal, Gfinet.Config.Service.PropertiesDataM[] propertiesDataMs) + 0xa3 bytes Gfinet.Config.dll!Gfinet.Config.Service.WSServiceImpl.AddOrUpdateProperties(int setId, Gfinet.Config.Service.PropertiesDataM[] properties) + 0x46 bytes [Native to Managed Transition] Gfinet.Config.dll!Gfinet.Config.Service.ServiceAspect.InvocationHandler(object target, System.Reflection.MethodBase method, object[] parameters) + 0x49e bytes Gfinet.Config.dll!Gfinet.Config.DynamicProxy.DynamicProxyImpl.Invoke(System.Runtime.Remoting.Messaging.IMessage message) + 0x110 bytes mscorlib.dll!System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(ref System.Runtime.Remoting.Proxies.MessageData msgData, int type) + 0xee bytes Tici.Kraps.Services.dll!Tici.Kraps.Services.Configuration.GFINetConfiguration.StoreElement(string application, string category, string id, string elementValue, bool save) Line 303 + 0x55 bytes C# Tici.Kraps.Services.dll!Tici.Kraps.Services.Configuration.GFINetConfiguration.SaveAllInternal() Line 582 + 0x6e bytes C# Tici.Kraps.Services.dll!Tici.Kraps.Services.Configuration.GFINetConfiguration.SaveAll(bool async) Line 434 + 0x8 bytes C# Tici.Kraps.Services.dll!Tici.Kraps.Services.Configuration.GFINetConfiguration.SaveAll() Line 406 + 0xa bytes C# Tici.Kraps.Services.dll!Tici.Kraps.Services.Container.Persistor.Save() Line 59 + 0xc bytes C# Spark.exe!Tici.Kraps.RibbonShell.OnBtnSaveWorkspaceItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e) Line 642 + 0xf bytes C# DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.BarItem.OnClick(DevExpress.XtraBars.BarItemLink link) + 0x108 bytes DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.BarBaseButtonItem.OnClick(DevExpress.XtraBars.BarItemLink link) + 0x47 bytes DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.BarItemLink.OnLinkClick() + 0x245 bytes DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.BarItemLink.OnLinkAction(DevExpress.XtraBars.BarLinkAction action, object actionArgs) + 0xb3 bytes DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.BarButtonItemLink.OnLinkAction(DevExpress.XtraBars.BarLinkAction action, object actionArgs) + 0x47e bytes DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.BarItemLink.OnLinkActionCore(DevExpress.XtraBars.BarLinkAction action, object actionArgs) + 0x82 bytes DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.ViewInfo.BarSelectionInfo.ClickLink(DevExpress.XtraBars.BarItemLink link) + 0x85 bytes DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.ViewInfo.BarSelectionInfo.UnPressLink(DevExpress.XtraBars.BarItemLink link) + 0x1e5 bytes DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.Ribbon.Handler.BaseRibbonHandler.OnUnPressItem(DevExpress.Utils.DXMouseEventArgs e, DevExpress.XtraBars.Ribbon.ViewInfo.RibbonHitInfo hitInfo) + 0xa7 bytes DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.Ribbon.Handler.BaseRibbonHandler.OnUnPress(DevExpress.Utils.DXMouseEventArgs e, DevExpress.XtraBars.Ribbon.ViewInfo.RibbonHitInfo hitInfo) + 0x5f bytes DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.Ribbon.Handler.BaseRibbonHandler.OnMouseUp(DevExpress.Utils.DXMouseEventArgs e) + 0x19a bytes DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.Ribbon.Handler.RibbonHandler.OnMouseUp(DevExpress.Utils.DXMouseEventArgs e) + 0x47 bytes DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.Ribbon.RibbonControl.OnMouseUp(System.Windows.Forms.MouseEventArgs e) + 0x95 bytes System.Windows.Forms.dll!System.Windows.Forms.Control.WmMouseUp(ref System.Windows.Forms.Message m, System.Windows.Forms.MouseButtons button, int clicks) + 0x2d1 bytes System.Windows.Forms.dll!System.Windows.Forms.Control.WndProc(ref System.Windows.Forms.Message m) + 0x93a bytes DevExpress.Utils.v11.2.dll!DevExpress.Utils.Controls.ControlBase.WndProc(ref System.Windows.Forms.Message m) + 0x81 bytes DevExpress.XtraBars.v11.2.dll!DevExpress.XtraBars.Ribbon.RibbonControl.WndProc(ref System.Windows.Forms.Message m) + 0x85 bytes System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.OnMessage(ref System.Windows.Forms.Message m) + 0x13 bytes System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.WndProc(ref System.Windows.Forms.Message m) + 0x31 bytes System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.Callback(System.IntPtr hWnd, int msg, System.IntPtr wparam, System.IntPtr lparam) + 0x96 bytes [Native to Managed Transition] [Managed to Native Transition] DevExpress.Utils.v11.2.dll!DevExpress.Utils.Win.Hook.ControlWndHook.WindowProc(System.IntPtr hWnd, int message, System.IntPtr wParam, System.IntPtr lParam) + 0x159 bytes [Native to Managed Transition] [Managed to Native Transition] System.Windows.Forms.dll!System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(System.IntPtr dwComponentID, int reason, int pvLoopData) + 0x287 bytes System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(int reason, System.Windows.Forms.ApplicationContext context) + 0x16c bytes System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoop(int reason, System.Windows.Forms.ApplicationContext context) + 0x61 bytes System.Windows.Forms.dll!System.Windows.Forms.Application.Run(System.Windows.Forms.Form mainForm) + 0x31 bytes Tici.Kraps.Services.dll!Tici.Kraps.Services.Container.DefaultApplicationRunner.Run() Line 41 + 0x17 bytes C# Kraps.exe!Tici.Kraps.Program.Main() Line 105 + 0x9 bytes C# [Native to Managed Transition] [Managed to Native Transition] mscorlib.dll!System.AppDomain.ExecuteAssembly(string assemblyFile, System.Security.Policy.Evidence assemblySecurity, string[] args) + 0x6d bytes Microsoft.VisualStudio.HostingProcess.Utilities.dll!Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() + 0x2a bytes mscorlib.dll!System.Threading.ThreadHelper.ThreadStart_Context(object state) + 0x63 bytes mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool ignoreSyncCtx) + 0xb0 bytes mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) + 0x2c bytes mscorlib.dll!System.Threading.ThreadHelper.ThreadStart() + 0x44 bytes [Native to Managed Transition]

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• datalist edit mode.

  - by Ranjana

  i have a datalist control <ItemTemplate> <tr> <td height="31px"> <asp:Label ID="lblStudentName" runat="server" Text="StudentName :" Font-Bold="true"></asp:Label> <%# DataBinder.Eval(Container.DataItem, "StudentName") %> </td> <td height="31px"> <asp:LinkButton ID="lnkEdit" runat="server" CommandName="edit">Edit</asp:LinkButton> </td> </tr> <tr> <td> <asp:Label ID="lblAdmissionNo" runat="server" Text="AdmissionNo :" Font-Bold="true"></asp:Label> <%# DataBinder.Eval(Container.DataItem, "AdmissionNo")%> </td> </tr> <tr> <td height="31px"> <asp:Label ID="lblStudentRollNo" runat="server" Text="StdentRollNo :" Font-Bold="true"></asp:Label> <%# DataBinder.Eval(Container.DataItem, "StdentRollNo") %> </td> <td height="31px"> <asp:LinkButton ID="lnkEditroll" runat="server" CommandName="edit">Edit</asp:LinkButton> </td> </tr> </ItemTemplate> <EditItemTemplate> <tr> <td height="31px"> <asp:Label ID="lblStudentName" runat="server" Text="StudentName :" Font-Bold="true"></asp:Label> <asp:TextBox ID="txtProductName" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "StudentName") %>'></asp:TextBox> </td> <td> <asp:LinkButton ID="lnkUpdate" runat="server" CommandName="update">Update</asp:LinkButton> <asp:LinkButton ID="lnkCancel" runat="server" CommandName="cancel">Cancel</asp:LinkButton> </td> </tr> <tr> <td height="31px"> <asp:Label ID="lblAdmissionNo" runat="server" Text="AdmissionNo :" Font-Bold="true"></asp:Label> <%# DataBinder.Eval(Container.DataItem, "AdmissionNo")%> </td> </tr> <tr> <td height="31px"> <asp:Label ID="lblStudentRollNo" runat="server" Text="StudentRollNo :" Font-Bold="true"></asp:Label> <asp:TextBox ID="txtStudentRollNo" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "StdentRollNo") %>'></asp:TextBox> </td> <td> <asp:LinkButton ID="LinkButton1" runat="server" CommandName="update">Update</asp:LinkButton> <asp:LinkButton ID="LinkButton2" runat="server" CommandName="cancel">Cancel</asp:LinkButton> </td> </tr> </EditItemTemplate> <FooterTemplate> </table> </FooterTemplate> </asp:DataList> code behind: protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { DataTable dt = new DataTable(); dt = obj.GetSamples(); DataList1.DataSource = dt; DataList1.DataBind(); } } public void DataBind() { DataTable dt = new DataTable(); dt = obj.GetSamples(); DataList1.DataSource = dt; DataList1.DataBind(); } protected void DataList1_EditCommand1(object source, DataListCommandEventArgs e) { DataList1.EditItemIndex = e.Item.ItemIndex; DataBind(); } protected void DataList1_CancelCommand1(object source, DataListCommandEventArgs e) { DataList1.EditItemIndex = -1; DataBind(); } protected void DataList1_UpdateCommand1(object source, DataListCommandEventArgs e) { // Get the DataKey value associated with current Item Index. // int AdmissionNo = Convert.ToInt32(DataList1.DataKeys[e.Item.ItemIndex]); string AdmissionNo = DataList1.DataKeys[e.Item.ItemIndex].ToString(); // Get updated value entered by user in textbox control for // ProductName field. TextBox txtProductName; txtProductName = (TextBox)e.Item.FindControl("txtProductName"); TextBox txtStudentRollNo; txtStudentRollNo = (TextBox)e.Item.FindControl("txtStudentRollNo"); // string variable to store the connection string // retrieved from the connectionStrings section of web.config string connectionString = ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString; // sql connection object SqlConnection mySqlConnection = new SqlConnection(connectionString); // sql command object initialized with update command text SqlCommand mySqlCommand = new SqlCommand("update SchoolAdmissionForm set StudentName=@studentname ,StdentRollNo=@studentroll where AdmissionNo=@admissionno", mySqlConnection); mySqlCommand.Parameters.Add("@studentname", SqlDbType.VarChar).Value = txtProductName.Text; mySqlCommand.Parameters.Add("@admissionno", SqlDbType.VarChar).Value = AdmissionNo; mySqlCommand.Parameters.Add("@studentroll", SqlDbType.VarChar).Value = txtStudentRollNo.Text; // check the connection state and open it accordingly. if (mySqlConnection.State == ConnectionState.Closed) mySqlConnection.Open(); // execute sql update query mySqlCommand.ExecuteNonQuery(); // check the connection state and close it accordingly. if (mySqlConnection.State == ConnectionState.Open) mySqlConnection.Close(); // reset the DataList mode back to its initial state DataList1.EditItemIndex = -1; DataBind(); // BindDataList(); } But it works fine.... but when i click edit command both the Fields 1.StudentName 2.StudentRollNo im getting textboxes to all the fields where i placed textbox when i click 'edit' command and not the particular field alone . but i should get oly the textbox visible to the field to which i clik as 'edit' , and the rest remain same without showing textboxes even though it is in editmode

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• How to make efficient code emerge through unit testing

  - by Jean

  Hi, I participate in a TDD Coding Dojo, where we try to practice pure TDD on simple problems. It occured to me however that the code which emerges from the unit tests isn't the most efficient. Now this is fine most of the time, but what if the code usage grows so that efficiency becomes a problem. I love the way the code emerges from unit testing, but is it possible to make the efficiency property emerge through further tests ? Here is a trivial example in ruby: prime factorization. I followed a pure TDD approach making the tests pass one after the other validating my original acceptance test (commented at the bottom). What further steps could I take, if I wanted to make one of the generic prime factorization algorithms emerge ? To reduce the problem domain, let's say I want to get a quadratic sieve implementation ... Now in this precise case I know the "optimal algorithm, but in most cases, the client will simply add a requirement that the feature runs in less than "x" time for a given environment. require 'shoulda' require 'lib/prime' class MathTest < Test::Unit::TestCase context "The math module" do should "have a method to get primes" do assert Math.respond_to? 'primes' end end context "The primes method of Math" do should "return [] for 0" do assert_equal [], Math.primes(0) end should "return [1] for 1 " do assert_equal [1], Math.primes(1) end should "return [1,2] for 2" do assert_equal [1,2], Math.primes(2) end should "return [1,3] for 3" do assert_equal [1,3], Math.primes(3) end should "return [1,2] for 4" do assert_equal [1,2,2], Math.primes(4) end should "return [1,5] for 5" do assert_equal [1,5], Math.primes(5) end should "return [1,2,3] for 6" do assert_equal [1,2,3], Math.primes(6) end should "return [1,3] for 9" do assert_equal [1,3,3], Math.primes(9) end should "return [1,2,5] for 10" do assert_equal [1,2,5], Math.primes(10) end end # context "Functionnal Acceptance test 1" do # context "the prime factors of 14101980 are 1,2,2,3,5,61,3853"do # should "return [1,2,3,5,61,3853] for ${14101980*14101980}" do # assert_equal [1,2,2,3,5,61,3853], Math.primes(14101980*14101980) # end # end # end end and the naive algorithm I created by this approach module Math def self.primes(n) if n==0 return [] else primes=[1] for i in 2..n do if n%i==0 while(n%i==0) primes<<i n=n/i end end end primes end end end

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• Print a HTML page in landscape mode?

  - by yoz1k

  Is it possible to print a simple page in landscape mode? (without the need for the user to go to printer settings?) <!DOCTYPE html> <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> <style type="text/css" media="print"/> @page { size: landscape; margin: 2cm; } body { color: red; } </style> <style type="text/css" media="all" > body { font-size: 10pt; font-family: Arial; } table td { padding: 2em; } </style> </head> <body> <table> <tr> <td>a</td><td>b</td><td>c</td><td>d</td><td>e</td><td>f</td><td>g</td><td>h</td><td>i</td><td>j</td><td>k</td><td>l</td><td>m</td><td>n</td><td>o</td><td>p</td><td>q</td><td>r</td><td>s</td><td>t</td><td>u</td><td>v</td><td>w</td><td>x</td><td>y</td><td>z</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td><td>e</td><td>f</td><td>g</td><td>h</td><td>i</td><td>j</td><td>k</td><td>l</td><td>m</td><td>n</td><td>o</td><td>p</td><td>q</td><td>r</td><td>s</td><td>t</td><td>u</td><td>v</td><td>w</td><td>x</td><td>y</td><td>z</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td><td>e</td><td>f</td><td>g</td><td>h</td><td>i</td><td>j</td><td>k</td><td>l</td><td>m</td><td>n</td><td>o</td><td>p</td><td>q</td><td>r</td><td>s</td><td>t</td><td>u</td><td>v</td><td>w</td><td>x</td><td>y</td><td>z</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td><td>e</td><td>f</td><td>g</td><td>h</td><td>i</td><td>j</td><td>k</td><td>l</td><td>m</td><td>n</td><td>o</td><td>p</td><td>q</td><td>r</td><td>s</td><td>t</td><td>u</td><td>v</td><td>w</td><td>x</td><td>y</td><td>z</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td><td>e</td><td>f</td><td>g</td><td>h</td><td>i</td><td>j</td><td>k</td><td>l</td><td>m</td><td>n</td><td>o</td><td>p</td><td>q</td><td>r</td><td>s</td><td>t</td><td>u</td><td>v</td><td>w</td><td>x</td><td>y</td><td>z</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td><td>e</td><td>f</td><td>g</td><td>h</td><td>i</td><td>j</td><td>k</td><td>l</td><td>m</td><td>n</td><td>o</td><td>p</td><td>q</td><td>r</td><td>s</td><td>t</td><td>u</td><td>v</td><td>w</td><td>x</td><td>y</td><td>z</td> </tr> </table> </body> </html> the solution @page size: landscape didn't help. any ideas?

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• How do I fix “Ubuntu is running in low-graphics mode?” for NVIDIA GeForce GT555M

  - by David Chen

  As title, I'm using Ubuntu 10.04, and my ubuntu kept showing the sign “Ubuntu is running in low-graphics mode”. I've read another question with same topic (http://askubuntu.com/questions/10664/how-do-i-fix-ubuntu-is-running-in-low-graphics-mode ), but the other one is using ATI Radeon X1200. How can I fix the problem? I'm running Ubuntu on a 200GB partition, and the rest of my computer is Windows7. My graphic card is NVIDIA GeForce GT 555M, and my computer is ACER ASPIRE 5951G.

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• what's best language to mate with Adobe Flex-based GUI for math crunching?

  - by gkdsp

  Hi, I'm not a software expert but need to outsource a web-based scientific GUI application, and I'm considering Adobe Flex. My math routines are currently in Javascript and C/C+. Having no experience with Flex, was hoping someone could help me understand what options are available for performing (preferably fast and efficient) CLIENT-side calculations. That is, can Flex interact with Javascript and/or C easily? If not, is actionscript or other language preferred? Downsides/tradeoffs? Need functions like LOG10, LN, SQRT, and would be nice to also have the error function (ERF) and complementary error function (ERFC), although I may be able to derive these last two from more basic functions if necessary. Thanks!

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• WebP se dote d'un mode de compression d'images sans perte, le format open source de Google veut aussi concurrencer le PNG

  WebP se dote d'un mode de compression d'images sans perte Le format open source de Google veut aussi concurrencer le PNG Mise à jour du 21 novembre 2011 Google voit grand pour son format d'image WebP et veut manifestement en faire un format à tout faire. Positionné au départ (lire ci-devant) comme un concurrent plus optimisé que le JPEG, avec en prime une couche alpha progressive (de transparence), il se dote aujourd'hui de capacités d'optimisation non destructives des images, à l'instar du PNG. Le nouveau mode lossless (sans perte) allierait densité de compression et facilité de décodage d'après un billet...

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• Windows 8 : Microsoft dépose un nouveau brevet, qui rends encore plus plausible l'existence d'un mode "Direct Experience"

  Windows 8 : Microsoft dépose un nouveau brevet, qui rends encore plus plausible l'existence d'un mode "Direct Experience" Mise à jour du 06.02.2011 par Katleen En août 2010, nous vous parlions de l'hypothétique mode "Direct Experience", qui pourrait être disponible dans la prochaine version de Windows (voir news précédentes) et dont la but serait d'accélérer l'exécution de contenus multimédias. En gros, il permettrait à l'OS de démarrer sous différents modes suivant les besoins spécifiques détectés (par exemple, si un DVD est inséré dans...

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• File upload fails when user is authenticated. Using IIS7 Integrated mode.

  - by Nikkelmann

  These are the user identities my website tells me that it uses: Logged on: NT AUTHORITY\NETWORK SERVICE (Can not write any files at all) and Not logged on: WSW32\IUSR_77 (Can write files to any folder) I have a ASP.NET 4.0 website on a shared hosting IIS7 web server running in Integrated mode with 32-bit applications support enabled and MSSQL 2008. Using classic mode is not an option since I need to secure some static files and I use Routing. In my web.config file I have set the following: <system.webServer> <modules runAllManagedModulesForAllRequests="true" /> </system.webServer> My hosting company says that Impersonation is enabled by default on machine level, so this is not something I can change. I asked their support and they referred me to this article: http://www.codinghub.net/2010/08/differences-between-integrated-mode-and.html Citing this part: Different windows identity in Forms authentication When Forms Authentication is used by an application and anonymous access is allowed, the Integrated mode identity differs from the Classic mode identity in the following ways: * ServerVariables["LOGON_USER"] is filled. * Request.LogognUserIdentity uses the credentials of the [NT AUTHORITY\NETWORK SERVICE] account instead of the [NT AUTHORITY\INTERNET USER] account. This behavior occurs because authentication is performed in a single stage in Integrated mode. Conversely, in Classic mode, authentication occurs first with IIS 7.0 using anonymous access, and then with ASP.NET using Forms authentication. Thus, the result of the authentication is always a single user-- the Forms authentication user. AUTH_USER/LOGON_USER returns this same user because the Forms authentication user credentials are synchronized between IIS 7.0 and ASP.NET. A side effect is that LOGON_USER, HttpRequest.LogonUserIdentity, and impersonation no longer can access the Anonymous user credentials that IIS 7.0 would have authenticated by using Classic mode. How do I set up my website so that it can use the proper identity with the proper permissions? I've looked high and low for any answers regarding this specific problem, but found nil so far... I hope you can help!

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• Why is the link between my switch and my router always negotiating half-duplex mode?

  - by Massimo

  I have a Cisco 2950 switch which has one of its ports connected to an Internet router provided by my ISP; I have no access to the router configuration, but I manage the switch. If I leave all switch ports with their default setup (auto-negotiation of speed and duplex mode), this link always connects at 100 MBit/s, but in half-duplex mode. I've tried replacing the cable, and also moving the link to another switch port: the result is always the same. A different device connected to the same port (or to any switch port, really) shows no problem at all. It could be guesed that someone configured the router to only connect in half-duplex mode... BUT, here's the catch: if I manually force the switch port to full-duplex mode (duplex full in the interface configuration), the link goes up, stays up and is completely stable. So: The connection is not forced to half-duplex mode by the router, otherwise it would not connect at all if I force the switch end to full-duplex. There is no actual link problem, otherwise the full-duplex connection would not go up or would at least show some errors. But if I leave the port free to auto-negotiate, it always connects in half-duplex mode. Why?

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• Safemode Startup Issues on Vista 64 Bit

  - by GnrlBzik

  Before i ask the question, let me point out that this is not a hardware issue. I have a clean install of vista on another hd that runs on same hardware, i am pretty sure its a corruption of a drive or a file, i presume it might be video driver. When windows wont start via normal boot i just get black screen after initial load up of os, so i boot into savemode, I end up having black screen with a mouse pointer visible, after initial load of os. The shut down button is responsive. Of course, I can install clean copy of os, and prior to that can retrieve all other files that i need by accessing hd itself, i can restore my pc from my external back up as well. Although i have all these options, i was wondering if there anything else i can do that can help me fix this issue. In save mode, it looks like I am capable of logging in after initial load of os, even though i cant see the process it self, i do see the mouse pointer. By visual memory i navigated to password field, and entered my password, hit enter, I get the loading mouse pointer, nothing really changes, same black screen and mouse pointer, but when i tried to access task manager for a second i got a safemode watermark at all four corners. Any help would be appriciated. Thank you in advance.

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• How can I generate filesystem images that are usable on many different virtualization systems?

  - by Mark Longair

  I have written a script that generates a root filesystem image (based on Debian lenny) suitable for User-Mode Linux. (Essentially this script creates a filesystem image, mounts it with a loop device, uses debootstrap to create a lenny install, sets up a static IP for TUN/TAP networking, adds public keys for login by SSH and installs a web application.) These filesystem images work pretty well with UML, but it would be nice to be able to generate similar images that people can use on alternative virtualization software, and I'm not familiar with these options at all. In particular, since the idea is to use this image as a standalone server for testing the web application, it's important that the networking works. I wonder if anyone can suggest what would be involved in customizing such root filesystem images such that they could be used with other virtualization software, such as VMware, Xen or as an Amazon EC2 instance? Two particular concerns are: If such systems don't use a raw filesystem image (e.g. they need headers with metadata or are compressed in some particular way) do there exist tools to convert between the different formats? I assume that in the filesystem, at least /etc/network/interfaces will have to be customized, but are more involved changes likely to be necessary? Many thanks for any suggestions...

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• Windows 7 VM log on lockout

  - by AKa

  My Windows 7 XP Mode virtual machine has just locked me out of password log on. Two years of use and it never required I use a password on wake up, I never asked for that. Suddenly yesterday, password required! I located password and used it successfully a couple of times, but now even that is not good enough! Perhaps (unfairly) because I tried to get to the bottom of the new phenomenon and removed the password from the user accounts? Permissions are still set to ok for all users. I have been all the way through the settings I can access with the VM file hibernated, and have deleted the previously saved log on info, which always previously worked automatically as charged. Now when I attempt to log on it asks me for credentials, seems like progress, but when I offer them, and check the "remember my credentials" box, I still get the splash screen "The system could not log you on. [reminder about caps...]" !! Round and round. Back up and restore point versions of the VM toss me back into the same log on loop. There are no other machines on any network, I am the administrator and sole user. It must be specifically about the log on, a speck of dust corruption ... is there a way around this? I tried creating a new VM but the black inner box gets stuck at one point requesting I insert a boot disc. Thanks for input, AKa

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