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  • Slope requires a real as parameter 2?

    - by Dave Jarvis
    Question How do you pass the correct value to udf_slope's second parameter type? Attempts CAST(Y.YEAR AS FLOAT), but that failed (SQL error). Y.YEAR + 0.0, but that failed, too (see error message). slope(D.AMOUNT, 1.0), failed as well Error Message Using udf_slope fails due to: Can't initialize function 'slope'; slope() requires a real as parameter 2 Code SELECT D.AMOUNT, Y.YEAR, slope(D.AMOUNT, Y.YEAR + 0.0) as SLOPE, intercept(D.AMOUNT, Y.YEAR + 0.0) as INTERCEPT FROM YEAR_REF Y, DAILY D Here, D.AMOUNT is a FLOAT and Y.YEAR is an INTEGER. Create Function The slope function was created as follows: CREATE AGGREGATE FUNCTION slope RETURNS REAL SONAME 'udf_slope.so'; Function Signature From udf_slope.cc: double slope( UDF_INIT* initid, UDF_ARGS* args, char* is_null, char* is_error ) Example Usages Reading the fine manual reveals: UDF intercept() Calculates the intercept of the linear regression of two sets of variables. Function name intercept Input parameter(s) 2 (dependent variable: REAL, independent variable: REAL) Examples SELECT intercept(income,age) FROM customers UDF slope() Calculates the slope of the linear regression of two sets of variables. Function name slope Input parameter(s) 2 (dependent variable: REAL, independent variable: REAL) Examples SELECT slope(income,age) FROM customers Thoughts? Thank you!

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  • Don&rsquo;t Miss &ldquo;Transform Field Service Delivery with Oracle Real-Time Scheduler&rdquo;

    - by ruth.donohue
    Field resources are an expensive element in the service equation. Maximizing the scheduling and routing of these resources is critical in reducing costs, increasing profitability, and improving the customer experience. Oracle Real-Time Scheduler creates cost-optimized plans and schedules for service technicians that increase operational efficiencies and improve margins. It enhances Oracle’s Siebel Field Service with real-time scheduling and dispatch capabilities that ensure service requests are allocated efficiently and service levels are honored. Join our live Webcast to learn how your organization can leverage Oracle Real-Time Scheduler to: Increase operational efficiency with real-time scheduling that enables field service technicians to handle more calls per day and reduce travel mileage Resolve issues faster with dynamic work flows that ensure you have the right technician with the right skill set for the right job Improve the customer experience with real-time planning that optimizes field technician routing, reduces customer wait times, and minimizes missed SLAs Date: Thursday, March 10, 2011 Time: 8:30 am PT / 11:30 am ET / 4:30 pm UK / 5:30 pm CET Click here to register now.   Technorati Tags: Siebel Field Service,Oracle Real-Time Scheduler

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  • Handle complexity in large software projects

    - by Oliver Vogel
    I am a lead developer in a larger software projects. From time to time its getting hard to handle the complexity within this project. E. g. Have the whole big picture in mind all the time Keeping track of the teammates work results Doing Code Reviews Supply management with information etc. Are there best practices/ time management techniques to handle these tasks? Are there any tools to support you having an overview?

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  • To Obtain EPOCH Time Value from a Packed BIT Structure in C [migrated]

    - by xde0037
    This is not a home assignment! We have a binary data file which has following data structure: (It is a 12 byte structure): I need to find out Epoch time value(total time value is packed in 42 bits as described below): Field-1 : Byte 1, Byte 2, + 6 Bits from Byte 3 Time-1 : 2 Bits from Byte 3 + Byte 4 Time-2 : Byte 5, Byte 6, Byte 7, Byte 8 Field-2 : Byte 9, Byte 10, Byte 11, Byte 12 For Field-1 and Field-2 I do not have issue as they can be taken out easily. I need time value in Epoch Time (long) as it has been packed in Bytes 5,6,7,8 and 3 and 4 as follows: (the bit structure for the time value is as follows): Bytes 5 to 8 (32 bit word) Packs time value bits from 0 thru 31 (byte 5 has 0 to 7 bits, byte 6 has 8 to 15, byte 7 has 16 to 23, byte 8 has 24 to 31). the remaining 10 bits of time value are packed in Bytes 3 and byte 4 as follows: byte 3 has 2 bits:32 and 33, and Byte 4 has remaining bits : 34 to 41. So total bits for time value is 42 bits, packed as above. I need to compute epoch value coming out of these 42 bits. How do I do it? I have done something like this but not sure it gives me correct value: typedef struct P_HEADER { unsigned int tmuNumber : 21; unsigned int time1 : 10; // Bits 6,7 from Byte-3 + 8 bits from Byte-4 unsigned int time2 : 32; // 32 bits: Bytes 5,6,7,8 unsigned int traceKey : 32; } __attribute__((__packed__)) P_HEADER; Then in the code : P_HEADER *header1; //get input string in hexa,etc..etc.. //parse the input with the header as : header1 = (P_HEADER *)inputBuf; // then print the header1->time1, header1->time2 .... long ttime = header1->time1|header1->time2; //?? is this the way to get values out? Any hint tip will be appreciated. Environment is : gcc 4.1, Linux Thanks in advance.

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  • Summer daylight time not changing on some active directory domain clients.

    - by Nick Gorbikoff
    We just had a summer daylight change in US. and pc's on my network are behaving strange, some of them change time and some didn't. My network: 2 locations both in Midwest, same time zone. Location 1: 120 pcs (windows xp & windows 200) , with 1 Active Direcotry Domain Controller on Windows 2003 Standard. A couple of windows 2000 servers (they up to date) the rest of the servers are Xen or Debian machines (all up to date) , Second location connected through OpenVPN link all pc's are running fine - but they are all connecting to our AD domain controller. Locaiton 2: 10 pcs, and a shared LAN NAS. Both of the routers/firewalls in both locations are pFsense boxes with ntp service running - but it's up to date. Tried all the usual suspects: I have all the latest updates installed restarted them domain controller is running fine most computers are running fine I have only one domain controller on my network also my firewall serves as ntp server (pfsense) but it's up to date. all of the linux machines are fine since they are querying firewall / router for the time. about 1/3 of my pcs are 1 hour behind. If I change them manually they just change back ( the way domain pc's are supposed to). I've tried everything but I can't think of anything else to try.

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  • "date_part('epoch', now() at time zone 'UTC')" not the same time as "now() at time zone 'UTC'" in po

    - by sirlark
    I'm writing a web based front end to a database (PHP/Postgresql) in which I need to store various dates/times. The times are meant to be always be entered on the client side in the local time, and displayed in the local time too. For storage purposes, I store all dates/times as integers (UNIX timestamps) and normalised to UTC. One particular field has a restriction that the timestamp filled in is not allowed to be in the future, so I tried this with a database constraint... CONSTRAINT not_future CHECK (timestamp-300 <= date_part('epoch', now() at time zone 'UTC')) The -300 is to give 5 minutes leeway in case of slightly desynchronised times between browser and server. The problem is, this constraint always fails when submitting the current time. I've done testing, and found the following. In PostgreSQL client: SELECT now() -- returns correct local time SELECT date_part('epoch', now()) -- returns a unix timestamp at UTC (tested by feeding the value into the date function in PHP correcting for its compensation to my time zone) SELECT date_part('epoch', now() at time zone 'UTC') -- returns a unix timestamp at two time zone offsets west, e.g. I am at GMT+2, I get a GMT-2 timestamp. I've figured out obviously that dropping the "at time zone 'UTC'" will solve my problem, but my question is if 'epoch' is meant to return a unix timestamp which AFAIK is always meant to be in UTC, why would the 'epoch' of a time already in UTC be corrected? Is this a bug, or I am I missing something about the defined/normal behaviour here.

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  • Floating point undesireable in highly critical code?

    - by Kirt Undercoffer
    Question 11 in the Software Quality section of "IEEE Computer Society Real-World Software Engineering Problems", Naveda, Seidman, lists fp computation as undesirable because "the accuracy of the computations cannot be guaranteed". This is in the context of computing acceleration for an emergency braking system for a high speed train. This thinking seems to be invoking possible errors in small differences between measurements of a moving object but small differences at slow speeds aren't a problem (or shouldn't be), small differences between two measurements at high speed are irrelevant - can there be a problem with small roundoff errors during deceleration for an emergency braking system? This problem has been observed with airplane braking systems resulting in hydroplaning but could this actually happen in the context of a high speed train? The concern about fp errors seems to not be well-founded in this context. Any insight? The fp is used for acceleration so perhaps the concern is inching over a speed limit? But fp should be just fine if they use a double in whatever implementation language. The actual problem in the text states: During the inspection of the code for the emergency braking system of a new high speed train (a highly critical, real-time application), the review team identifies several characteristics of the code. Which of these characteristics are generally viewed as undesirable? The code contains three recursive functions (well that one is obvious). The computation of acceleration uses floating point arithmetic. All other computations use integer arithmetic. The code contains one linked list that uses dynamic memory allocation (second obvious problem). All inputs are checked to determine that they are within expected bounds before they are used.

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  • Design pattern for an automated mechanical test bench

    - by JJS
    Background I have a test fixture with a number of communication/data acquisition devices on it that is used as an end of line test for a product. Because of all the various sensors used in the bench and the need to run the test procedure in near real-time, I'm having a hard time structuring the program to be more friendly to modify later on. For example, a National Instruments USB data acquisition device is used to control an analog output (load) and monitor an analog input (current), a digital scale with a serial data interface measures position, an air pressure gauge with a different serial data interface, and the product is interfaced through a proprietary DLL that handles its own serial communication. The hard part The "real-time" aspect of the program is my biggest tripping point. For example, I need to time how long the product needs to go from position 0 to position 10,000 to the tenth of a second. While it's traveling, I need to ramp up an output of the NI DAQ when it reaches position 6,000 and ramp it down when it reaches position 8,000. This sort of control looks easy from browsing NI's LabVIEW docs but I'm stuck with C# for now. All external communication is done by polling which makes for lots of annoying loops. I've slapped together a loose Producer Consumer model where the Producer thread loops through reading the sensors and sets the outputs. The Consumer thread executes functions containing timed loops that poll the Producer for current data and execute movement commands as required. The UI thread polls both threads for updating some gauges indicating current test progress. Unsure where to start Is there a more appropriate pattern for this type of application? Are there any good resources for writing control loops in software (non-LabVIEW) that interface with external sensors and whatnot?

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  • Floating point undesirable in highly critical code?

    - by Kirt Undercoffer
    Question 11 in the Software Quality section of "IEEE Computer Society Real-World Software Engineering Problems", Naveda, Seidman, lists fp computation as undesirable because "the accuracy of the computations cannot be guaranteed". This is in the context of computing acceleration for an emergency braking system for a high speed train. This thinking seems to be invoking possible errors in small differences between measurements of a moving object but small differences at slow speeds aren't a problem (or shouldn't be), small differences between two measurements at high speed are irrelevant - can there be a problem with small roundoff errors during deceleration for an emergency braking system? This problem has been observed with airplane braking systems resulting in hydroplaning but could this actually happen in the context of a high speed train? The concern about fp errors seems to not be well-founded in this context. Any insight? The fp is used for acceleration so perhaps the concern is inching over a speed limit? But fp should be just fine if they use a double in whatever implementation language. The actual problem in the text states: During the inspection of the code for the emergency braking system of a new high speed train (a highly critical, real-time application), the review team identifies several characteristics of the code. Which of these characteristics are generally viewed as undesirable? The code contains three recursive functions (well that one is obvious). The computation of acceleration uses floating point arithmetic. All other computations use integer arithmetic. The code contains one linked list that uses dynamic memory allocation (second obvious problem). All inputs are checked to determine that they are within expected bounds before they are used.

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  • Forward real IP through Haproxy => Nginx => Unicorn

    - by Hendrik
    How do I forward the real visitors ip adress to Unicorn? The current setup is: Haproxy => Nginx => Unicorn How can I forward the real IP address from Haproxy, to Nginx, to Unicorn? Currently it is always only 127.0.0.1 I read that the X headers are going to be depreceated. http://tools.ietf.org/html/rfc6648 - how will this impact us? Haproxy Config: # haproxy config defaults log global mode http option httplog option dontlognull option httpclose retries 3 option redispatch maxconn 2000 contimeout 5000 clitimeout 50000 srvtimeout 50000 # Rails Backend backend deployer-production reqrep ^([^\ ]*)\ /api/(.*) \1\ /\2 balance roundrobin server deployer-production localhost:9000 check Nginx Config: upstream unicorn-production { server unix:/tmp/unicorn.ordify-backend-production.sock fail_timeout=0; } server { listen 9000 default; server_name manager.ordify.localhost; root /home/deployer/apps/ordify-backend-production/current/public; access_log /var/log/nginx/ordify-backend-production_access.log; rewrite_log on; try_files $uri/index.html $uri @unicorn; location @unicorn { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_redirect off; proxy_pass http://unicorn-production; proxy_connect_timeout 90; proxy_send_timeout 90; proxy_read_timeout 90; } error_page 500 502 503 504 /500.html; client_max_body_size 4G; keepalive_timeout 10; }

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  • Windows 7 Change internet time settings tells me I have no permissions.

    - by Matthias Vance
    LS, While trying to solve my computer clock always running ahead (even when on, not just on every boot), I apparently broke some security settings. All I did (as far as I can remember) was stop and start the w32time service. Now, whenever I go to the "Internet time" tab, and click "Change settings..." Windows tells me I don't have permissions to do so. Facts I am a member of the Administrators group. In gpedit.msc, I checked that the Administrators group is allowed to change the system time. Kind regards, Matthias Vance

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  • Deleted the .AppleDouble files inside my Time Machine backups - are they still OK?

    - by Jon M
    My Ubuntu server is set up to emulate a TimeCapsule (after a very long weekend following the instructions here, here and here). My macbook pro has been backing up happily to it for a month or so now, and all seems well. The other day I was tidying up the extraneous files from my music collection on the server, got a bit loose with the find command... and ended up deleting all the .AppleDouble files underneath '/', which included the Time Machine folder. Now, Time Machine still appears to work fine, it backs up regularly, I can look through all the previous versions of my files, and they seem to restore without trouble. My question is: by deleting the .AppleDouble files, have I actually broken anything? Is the TM data still good, or should I trash it and start fresh (i.e. with a new 'day 0' full backup)?

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  • tradeoffs of iSCSI vs. AFP when using Time Machine with a NAS?

    - by Ajit George
    I'm setting up a home NAS device (Synology DS409) that I'm planning to use for Time Machine backups (amongst other things). What are the tradeoffs between using iSCSI or AFP to mount the backup volume? The Synology wiki suggests that iSCSI is better if the Mac will be frequently disconnected from the network or sleeping, from the point of view of the volume automatically remounting. What about filesystem consistency? Given that unplugging a USB drive without properly unmounting it often requires the Time Machine volume to be repaired, would iSCSI have the same issues?

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  • tradeoffs of iSCSI vs. AFP when using Time Machine with a NAS?

    - by ajit.george
    I'm setting up a home NAS device (Synology DS409) that I'm planning to use for Time Machine backups (amongst other things). What are the tradeoffs between using iSCSI or AFP to mount the backup volume? The Synology wiki suggests that iSCSI is better if the Mac will be frequently disconnected from the network or sleeping, from the point of view of the volume automatically remounting. What about filesystem consistency? Given that unplugging a USB drive without properly unmounting it often requires the Time Machine volume to be repaired, would iSCSI have the same issues? Thanks in advance.

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  • Why is ntpd not updating the time on my server?

    - by John
    I have ntpd running on my server. It's all the default settings, except I commented out its ability to be a server to other machines: # restrict -4 default kod notrap nomodify nopeer noquery # restrict -6 default kod notrap nomodify nopeer noquery restrict default ignore If I run ntpdate -q ntp.ubuntu.com, I'm told that my machine's clock is off by 7 seconds. What's going on? How can I diagnose what's happening, is there a log I can turn on? more info #1 # ntpq -np remote refid st t when poll reach delay offset jitter ============================================================================== 91.189.94.4 193.79.237.14 2 u 30 64 7 108.518 -0.136 0.361 more info #2 Here's what this looked like when I asked the question: # ntpdate -q ntp.ubuntu.com server 91.189.94.4, stratum 2, offset 7.191308, delay 0.13310 10 Jan 20:38:09 ntpdate[31055]: step time server 91.189.94.4 offset 7.191308 sec And here's what it looks like now, after restarting ntpd a couple times (I'm assuming that's what fixed it): # ntpdate -q ntp.ubuntu.com server 91.189.94.4, stratum 2, offset 0.000112, delay 0.13164 10 Jan 20:47:03 ntpdate[31419]: adjust time server 91.189.94.4 offset 0.000112 sec

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  • How does Windows handle Time? Updating RTC, etc. (Active Directory and Novell E-Directory)

    - by bshacklett
    I'm troubleshooting some time issues in my domain and before making any big changes I want to have a thorough understanding of what's going on. I've got a few lingering questions at the moment: What sources (rtc, ntp, etc.) are queried by Windows to keep time? How does this differ in a mixed Active Directory / Novell environment? What is the order that each source is queried in? How does Windows decide whether to act as an NTP client, peer or server? In what situations will Windows update the RTC, if ever?

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  • Can one use Airport (Time Capsule) with an external DHCP server?

    - by DNS
    I currently share my DSL connection using a wireless router with DHCP disabled, and dnsmasq running on a Mac Mini serving DHCP & DNS. This setup is important because I have clients doing PXE boot, and I need the control over DHCP that dnsmasq provides. There is also a Time Capsule on the network that's used purely as a backup device; its wireless functions are disabled. The wireless router is starting to get a little flaky, and since it doesn't support 802.11n I'd like to replace it. Rather than buying a new router, I'd like to just use the Time Capsule. But I see no way to disable its DHCP server; when I set the connection type to PPPoE, it insists on serving DHCP. Is there any way to use Airport PPPoE with a DHCP server elsewhere on the network?

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  • What's a standard productive vs total office hours ratio? [migrated]

    - by marianov
    So it goes like this: we are keeping track of tasks using Redmine. We log time spent doing tasks, but at the end of the week if we add up all the time spent at those tasks there is no way a person has spent 40hs working. I think that's correct because offices have overhead (reading emails, politics, coffee, distractions). What would be a normal productive time vs total time spent ratio? Other areas in the organization just measure time spent in the office (with the rfid badges that open the door) but we don't like that approach and we are trying to convince Auditing to measure us using redmine instead.

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  • Improve speed of "start menu" in Linux Mint 10 - Ubuntu 10.10 derivative [closed]

    - by Gabriel L. Oliveira
    I have a global menu (including application, administration and system tabs) that is taking too much time (for me) to load (about 2.5 seconds). Of course, this time is taken only during first start. After it have loaded, next times are better ( less than 0.2 miliseconds) The menu was taking more time before (about 5 seconds), and I found that was because of the 'Other' part of the menu, that included many applications installed with Wine, so I removed all of them (I didn't need them at all). I have a "normal" knowledge of programming, and I think that the process of starting the menu for the first time has some kind of "cache function", that tries to find which apps are present that need to be placed under menu to be shown to user. But didn't found this function so that I could analyze in details what he is doing (if searching for files under "~/.local/share/applications" or anything else). Also, I found that hitting "Alt-F2" also fires this "cache function", because after waiting it to load, the process of opening the menu took less than 0.2 miliseconds. So, could anyone help me in order to reduce this time? I found on internet that some user could reduce the time by resizing the icons of applications. But found here that most of my icons are already at 25x25 size. Any other idead? Maybe a multiprocess to load it, or include it under startup... don't know. Ps: Sorry if this is an awkward question, but I just do not like waiting for things to happen, and think that this process should be smoother than it's now. Also, thanks in advance!

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  • Should the number of developers be considered when estimating a task?

    - by Ludwig Magnusson
    I am pretty inexperienced with working in agile projects but I have tried it a few times and I always run into this problem when estimating a task. Do we bring into the estimate the number of developers that will work on the task? Let me explain: Task A is estimated to one time unit and developer 1 will work on it. Task B is also estimated to one time unit and developer 2 and 3 will work on it together. I.e. if developer 1 begins to work on task A at the same time developer 2 and 3 begins to work on task B they will all finish at the same time according to the estimate. Should the estimate for task B be twice of that for task A or the same? The problem as I see it is that when a task is received and estimated, it is not always possible to know how many people will work on it. And if you assumed that two developers would work on the task for one time unit but it turns out that only one developer will actually do it, this will not automatically mean that that developer will work on it for two time units. Is there any standard practice for this?

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  • How should I fix problems with file permissions while restoring from Time Machine?

    - by Andrew Grimm
    While restoring files from a Time Machine backup, I got the error message "The operation can’t be completed because you don’t have permission to access some of the items." because of problems with files in one folder. What's the safest way to deal with this? The folder in question has permissions like: Andrew-Grimms-MacBook-Pro:kmer agrimm$ pwd /Volumes/Time Machine Backups/Backups.backupdb/Andrew Grimm’s MacBook Pro/2010-12-09-224309/Macintosh HD/Users/agrimm/ruby/kmer Andrew-Grimms-MacBook-Pro:kmer agrimm$ ls -ltra total 6156896 drwxrwxrwx@ 19 agrimm staff 680 18 Jan 2008 Saccharomyces_cerevisiae -r--------@ 1 agrimm staff 60221852 4 Aug 2009 hs_ref_GRCh37_chrY.fa -r--------@ 1 agrimm staff 157488804 4 Aug 2009 hs_ref_GRCh37_chrX.fa (snip a few files) -r--------@ 1 agrimm staff 676063 27 Oct 2009 NC_001143.fna -rw-r--r--@ 1 agrimm staff 6148 23 Mar 2010 .DS_Store drwxr-xr-x@ 3 agrimm staff 1530 23 Mar 2010 . drwxr-xr-x@ 30 agrimm staff 1054 20 Nov 14:43 .. Is it ok to do sudo chmod, or is there a safer approach? Background: Files within the original folder on my computer also had weird permissions - I suspect I may have used sudo to copy some files from a thumbdrive onto my computer.

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