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• OS X: What does the '@' attribute on a file mean?

  - by claytontstanley

  On a Snow Leopard machine, at the Terminal: la ~/src/rmcl/ | grep RMCL -rw-r--r--@ 1 claytonstanley staff 6766167 Nov 13 2009 RMCL What is that '@' attribute? This file is part of an older OS X program that runs under Rosetta. I'm having issues where some older programs running under Rosetta require the @ attribute when opening files. But I'm not sure what that attribute is, so I have no way to know how to add/remove it. I did try a thorough Google search on this, but I wasn't able to find the answer. I would have thought this would be an easy one to find. Maybe the Google query isn't acting properly because of the single @ special character. Any info. is much appreciated. Thanks!

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• How computers display raw, low-level text and graphics

  - by panic

  My ever-growing interest in computers is making me ask deeper questions, that we don't seem to have to ask anymore. Our computers, at boot, as far as I understand it, are in text mode, in which a character can be displayed using the software interrupt 0x10 when AH=0x0e. We've all seen the famous booting font that always looks the same, regardless of what computer is booting. So, how on earth do computers output graphics at the lowest level, say, below the OS? And also, surely graphics aren't outputted a pixel at a time using software interrupts, as that sounds very slow? Is there a standard that defines basic outputting of vertices, polygons, fonts, etc. (below OpenGL for example, which OpenGL might use)? What makes me ask is why OS' can often be fine without official drivers installed; how do they do that? Apologies if my assumptions are incorrect. I would be very grateful for elaboration on these topics!

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• Why is "chmod -R 777 /" destructive?

  - by samwise

  This is a Canonical Question about File Permission and Why 777 is "destructive". I'm not asking how to fix this problem, as there are a ton of references of that already on Server Fault (reinstall OS). Why does it do anything destructive at all? If you've ever ran this command you pretty much immediately destroy your operating system. I'm not clear why removing restrictions has any impact on existing processes. For example, if I don't have read access to something and after a quick mistype in the terminal suddenly I now have access well... why does that cause Linux to break?

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• Create and Share a File (Also a mysterious error)

  - by Kirk

  My goal is to create a XML file and then send it through the share Intent. I'm able to create a XML file using this code FileOutputStream outputStream = context.openFileOutput(fileName, Context.MODE_WORLD_READABLE); PrintStream printStream = new PrintStream(outputStream); String xml = this.writeXml(); // get XML here printStream.println(xml); printStream.close(); I'm stuck trying to retrieve a Uri to the output file in order to share it. I first tried to access the file by converting the file to a Uri File outFile = context.getFileStreamPath(fileName); return Uri.fromFile(outFile); This returns file:///data/data/com.my.package/files/myfile.xml but I cannot appear to attach this to an email, upload, etc. If I manually check the file length, it's proper and shows there is a reasonable file size. Next I created a content provider and tried to reference the file and it isn't a valid handle to the file. The ContentProvider doesn't ever seem to be called a any point. Uri uri = Uri.parse("content://" + CachedFileProvider.AUTHORITY + "/" + fileName); return uri; This returns content://com.my.package.provider/myfile.xml but I check the file and it's zero length. How do I access files properly? Do I need to create the file with the content provider? If so, how? Update Here is the code I'm using to share. If I select Gmail, it does show as an attachment but when I send it gives an error Couldn't show attachment and the email that arrives has no attachment. public void onClick(View view) { Log.d(TAG, "onClick " + view.getId()); switch (view.getId()) { case R.id.share_cancel: setResult(RESULT_CANCELED, getIntent()); finish(); break; case R.id.share_share: MyXml xml = new MyXml(); Uri uri; try { uri = xml.writeXmlToFile(getApplicationContext(), "myfile.xml"); //uri is "file:///data/data/com.my.package/files/myfile.xml" Log.d(TAG, "Share URI: " + uri.toString() + " path: " + uri.getPath()); File f = new File(uri.getPath()); Log.d(TAG, "File length: " + f.length()); // shows a valid file size Intent shareIntent = new Intent(); shareIntent.setAction(Intent.ACTION_SEND); shareIntent.putExtra(Intent.EXTRA_STREAM, uri); shareIntent.setType("text/plain"); startActivity(Intent.createChooser(shareIntent, "Share")); } catch (FileNotFoundException e) { e.printStackTrace(); } break; } } I noticed that there is an Exception thrown here from inside createChooser(...), but I can't figure out why it's thrown. E/ActivityThread(572): Activity com.android.internal.app.ChooserActivity has leaked IntentReceiver com.android.internal.app.ResolverActivity$1@4148d658 that was originally registered here. Are you missing a call to unregisterReceiver()? I've researched this error and can't find anything obvious. Both of these links suggest that I need to unregister a receiver. Chooser Activity Leak - Android Why does Intent.createChooser() need a BroadcastReceiver and how to implement? I have a receiver setup, but it's for an AlarmManager that is set elsewhere and doesn't require the app to register / unregister. Code for openFile(...) In case it's needed, here is the content provider I've created. public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException { String fileLocation = getContext().getCacheDir() + "/" + uri.getLastPathSegment(); ParcelFileDescriptor pfd = ParcelFileDescriptor.open(new File(fileLocation), ParcelFileDescriptor.MODE_READ_ONLY); return pfd; }

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• Adjust parameters of serial port reading

  - by clinisbut

  Hello. I'm facing a particular issue that regards serial communication under win32. I'm communicating with a device can only accept frames when it is not already communicating. So I must find a valid frame and then inmediatelly send my request. I developed a class named Serial that handles basic operations on serial port (open, close, read, write) and then a Thread calls inside a loop read and write functions. Thread loop //Device is an object of class Serial while( device->isOpen() && !terminate ) { unsigned int readed = 0; unsigned long error = ERROR_SUCCESS; unsigned char* data = device->read( &readed, &error ); if( error==ERROR_SUCCESS ) { //If data received, deliver to upper level if( readed>0 ) { QByteArray output( (const char*)data, (signed int)readed ); emit dataArrived( output, readed ); } } else { //unrelated stuff } //Here I manage the writting issue //Only when nothing is received, and Upper layer wants to send a frame //(Upper layer only will mark as something to send when it detects a valid frame) if( readed==0 ) { out_lock.lock(); //If something to send... if( something_to_send > 0 ) { if( device->write( output_buffer, output_size, &error ) ) { //things... } } } } The Thread basically keeps reading, and when nothing is received, sees if somebody has signaled to send a frame (this means that a valid frame is just received). When this happens, it writes the frame through serial port. Here comes my problem. Inside the Serial::read() function: I use the overlapped way of reading: ::ClearCommError( handle, &dwErrors, &stat); if( stat.cbInQue ) { //If there's something to read, read it, please note the bytes to read parameter, here 1. bool ok = ::ReadFile( handle, buffer_in, 1, &bytes_read, &ov_reader ); if( !ok ) { DWORD _error = ::GetLastError(); if( _error == ERROR_IO_PENDING ) { DWORD result = ::WaitForMultipleObjects( 2, waiters, FALSE,INFINITE ); switch( result ) { //Eventshutdown case WAIT_OBJECT_0: /*code omitted*/break; case WAIT_OBJECT_0+1: ok = ::GetOverlappedResult( handle, &ov_reader, &bytes_read, true ); //check ok value omitted break; } } } } if( bytes_read>0 ) { *size = bytes_read; } Here starts my problem. When device sends me small frames (around 30 bytes) everything works fine, but when larger frames are sent, the code is not able to find any free time between frames causing the thread to never be able send any frame because readed is never 0. If I increase the number of bytes to read inside the read() function, lose the ability to detect when the device "listens": bool ok = ::ReadFile(handle, buffer_in, 50, &bytes_read, &ov_reader ); This happens because my app can receive the end of a frame together with the start of the next one. This behaviour is very common. In the other hand, if I change the INFINITE argument by a valid timeout in the WaitForMultipleObjects function, I lose data. So my question basically is... what I'm doing wrong? Why when reading 1 byte each time I don't find any free time to send my own frames? Thank you

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• Apple Wireless (aluminium) Keyboard on Windows

  - by Dave Arkell

  I have an apple wireless keyboard which I am using with my windows pc and it works excellently, and looks superb. It all connects fine (particularly with a flashed dbt-120). However, I haven't had great success with getting all those useful keys to work with the 'fn' key. I've been using uawks as a way to get it working, but it doesn't always work. Has anyone had success with any other tools to get the fn key working (and therefore creating shortcuts to 'End', 'Home', 'Break', 'Pgup', etc? I should point out that this is not a mac computer, it is a plain old pc.

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• How can I make the Outlook "To" field allow auto completion for all my contacts?

  - by Space Cracker

  When we make a new mail message in Outlook 2007 and try to write any letter in To field it shows an auto complete list with all available contacts that contain written letters. This list is displaying all emails that you have send to them before and over time this list grows as you send to more and more new contacts... My Issues: When we reinstall Windows, install new copy of Outlook, create a new mail message, try to write any character in To field it will not show any contacts and this leads to write it or choose from contacts. Is it in any way possible to make Outlook's contacts, or specific contacts I determine to be cached, appear in TO when I write any letter without need to write them again?

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• How to copy text out of a PDF without losing formatting?

  - by Colen

  When I copy text out of a PDF file and into a text editor, it ends up mangled in a variety of ways. Formatting like bold and italics are lost; soft line breaks within a paragraph of text are converted to hard line breaks; dashes to break a word over two lines are preserved even when they shouldn't be; and single and double quotes are replaced with ? signs. Ideally, I'd like to be able to copy text from a PDF and have formatting converted to HTML codes, "smart quotes" converted to " and ', and line breaks done properly. Is there any way to do this?

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• How i can make Outlook To field to allow auto complete for all my contacts ?

  - by Space Cracker

  When we make new mail message in outlook 2007 and try to write any letter in To field it show auto complete list with all available contacts that contain written letters. This list is appear with all emails that u send to them before and over time this list be more and more with new contacts you send to ... My Issues : When we reinstall windows ,install new copy of outlook,create new mail message ,try yo write any character in To field it will not show any contacts and this lead to write it or choose from contacts ... Is it any way to make outlook add my contacts or specific contacts I determined to be cached and appear in TOwhen i write any letter without need to write them again ?

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• outlook iptables configuration [update]

  - by mediaexpert

  I've a Debian mail server, but only the outlook users can't be able to download the emails. I've seen a lot of post about some kind of forwarding port configuration, I've tried some commands, but I don't be able to solve this problem, please help me. [LAST UPDATE] I find a lot of TIME WAIT on ipv6 netstat tcp6 0 0 my.mailserver.it:imap2 200-62-245-188.ip2:17060 TIME_WAIT - below some config files: pop3d I think the problem was here ##NAME: POP3AUTH:1 # # To advertise the SASL capability, per RFC 2449, uncomment the POP3AUTH # variable: # # POP3AUTH="LOGIN" # # If you have configured the CRAM-MD5, CRAM-SHA1 or CRAM-SHA256, set POP3AUTH # to something like this: # # POP3AUTH="LOGIN CRAM-MD5 CRAM-SHA1" POP3AUTH="" ##NAME: POP3AUTH_ORIG:1 # # For use by webadmin POP3AUTH_ORIG="PLAIN LOGIN CRAM-MD5 CRAM-SHA1 CRAM-SHA256" ##NAME: POP3AUTH_TLS:1 # # To also advertise SASL PLAIN if SSL is enabled, uncomment the # POP3AUTH_TLS environment variable: # # POP3AUTH_TLS="LOGIN PLAIN" POP3_TLS_REQUIRED = 0 POP3AUTH_TLS="" ##NAME: POP3AUTH_TLS_ORIG:0 # # For use by webadmin POP3AUTH_TLS_ORIG="LOGIN PLAIN" ##NAME: POP3_PROXY:0 # # Enable proxying. See README.proxy # # For use by webadmin POP3AUTH_TLS_ORIG="LOGIN PLAIN" ##NAME: POP3_PROXY:0 # # Enable proxying. See README.proxy POP3_PROXY=0 ##NAME: PROXY_HOSTNAME:0 # # Override value from gethostname() when checking if a proxy connection is # required. # PROXY_HOSTNAME= ##NAME: PORT:1 ##NAME: PROXY_HOSTNAME:0 # # Override value from gethostname() when checking if a proxy connection is # required. # PROXY_HOSTNAME= ##NAME: PORT:1 # # Port to listen on for connections. The default is port 110. # # Multiple port numbers can be separated by commas. When multiple port # numbers are used it is possibly to select a specific IP address for a # given port as "ip.port". For example, "127.0.0.1.900,192.68.0.1.900" # accepts connections on port 900 on IP addresses 127.0.0.1 and 192.68.0.1 # The ADDRESS setting is a default for ports that do not have a specified # IP address. # Port to listen on for connections. The default is port 110. # # Multiple port numbers can be separated by commas. When multiple port # numbers are used it is possibly to select a specific IP address for a # given port as "ip.port". For example, "127.0.0.1.900,192.68.0.1.900" # accepts connections on port 900 on IP addresses 127.0.0.1 and 192.68.0.1 # The ADDRESS setting is a default for ports that do not have a specified # IP address. PORT=110 ##NAME: ADDRESS:0 # # IP address to listen on. 0 means all IP addresses. ADDRESS=0 ##NAME: TCPDOPTS:0 # ##NAME: ADDRESS:0 # # IP address to listen on. 0 means all IP addresses. ADDRESS=0 ##NAME: TCPDOPTS:0 # # Other couriertcpd(1) options. The following defaults should be fine. # TCPDOPTS="-nodnslookup -noidentlookup" ##NAME: LOGGEROPTS:0 # # courierlogger(1) options. # LOGGEROPTS="-name=pop3d" ##NAME: DEFDOMAIN:0 # # Optional default domain. If the username does not contain the # first character of DEFDOMAIN, then it is appended to the username. # If DEFDOMAIN and DOMAINSEP are both set, then DEFDOMAIN is appended # only if the username does not contain any character from DOMAINSEP. # You can set different default domains based on the the interface IP # address using the -access and -accesslocal options of couriertcpd(1). DEFDOMAIN="@interzone.it" ##NAME: POP3DSTART:0 # # POP3DSTART is not referenced anywhere in the standard Courier programs # or scripts. Rather, this is a convenient flag to be read by your system # startup script in /etc/rc.d, like this: # # . /etc/courier/pop3d DEFDOMAIN="@mydomain.com" ##NAME: POP3DSTART:0 # # POP3DSTART is not referenced anywhere in the standard Courier programs # or scripts. Rather, this is a convenient flag to be read by your system # startup script in /etc/rc.d, like this: # # . /etc/courier/pop3d # case x$POP3DSTART in # x[yY]*) # /usr/lib/courier/pop3d.rc start # ;; # esac # # The default setting is going to be NO, until Courier is shipped by default # with enough platforms so that people get annoyed with having to flip it to # YES every time. # x[yY]*) # /usr/lib/courier/pop3d.rc start # ;; # esac # # The default setting is going to be NO, until Courier is shipped by default # with enough platforms so that people get annoyed with having to flip it to # YES every time. POP3DSTART=YES ##NAME: MAILDIRPATH:0 # # MAILDIRPATH - directory name of the maildir directory. # MAILDIRPATH=.maildir iptables Chain INPUT (policy DROP 20 packets, 1016 bytes) pkts bytes target prot opt in out source destination 60833 16M ACCEPT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:143 state NEW,ESTABLISHED 18970 971K ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp spts:1024:65535 dpt:110 state NEW,ESTABLISHED Chain FORWARD (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT tcp -- * * 192.168.0.0/24 0.0.0.0/0 tcp dpt:110 0 0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 0 0 ACCEPT tcp -- * * 192.168.1.0/24 0.0.0.0/0 tcp dpt:110 0 0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:25 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:110 pop3d.cnf RANDFILE = /usr/lib...pop3d.rand [req] default_bits = 1024 encrypt_key = yes distinguidhed_name = req_dn x509_extensions = cert_type prompt = no [req_dn] C=US ST=NY L= New York O=Courier Mail Server OU=Automatically-generated POP3 SSL key CN=localhost [email protected] [cert_type] nsCertType = server

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• Video has become blurred and smoothed out?!

  - by benwebdev

  Hi, Since yesterday video and graphics on my Windows 7 desktop seem to have become smoothed out and blurred slightly and I'm not sure why. The last thing I did on the machine was play Fallout New Vegas for the first time. An example can be seen in the picture here screenshot - note how smoothed out the character on the right seems, lots of definition looks lost. It's really annoying and happening regardless of what I watch. My system is below: Windows7 Ultimate 64 bit 6GB RAM Sapphire HD 5770 Vapor-X 1GB Gigabyte X58A-UD3R Motherboard Coolermaster Silent Pro M series 700W power supply All help greatly appreciated thanks

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• Remove Duplicate Messages from Maildir

  - by Joseph Holsten

  I've got a bunch of duplicate messages in my IMAP server's Maildir. What's the best way to remove them? Some relevant points: Shared Message-ID is usually a good enough definition of duplicate. A tiny script that removes all but one of the duplicate messages would work. Sometimes it's necessary to find duplicates based on shared message bodies. What's a reasonable definition of shared here? Bitwise equivalent? What about weird differences in line wrapping, escaping, character encoding? Sometimes there's some meaningful difference between 'duplicate' messages. What's the best way to review the differences in sets of 'duplicate' messages? Diffs?

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• How to disable ^C from being echoed on Linux on Ctrl-C

  - by pts

  When I press Ctrl-C in any pseudoterminal (xterm, gnome-terminal, rxvt, text console and SSH) in Karmic Koala, the string ^C gets echoed to the terminal in Ubuntu Karmic Koala. This hasn't happened in Ubuntu Jaunty Jackalope. I'd like to get rid of the extra ^C. Example: $ cat foo foo ^C $ _ I got the above by typing C, A, T, Enter, F, O, O, Enter, Ctrl-C. I want to get rid of the ^C, and get this for the same keypresses: $ cat foo foo $ _ I tried setting stty -echoctl, which created a single-character HT (or a box with Unicode 0003 in it) instead of the ^C. I want to see absolutely nothing when I press Ctrl-C. I'm using Linux linux 2.6.31-20-generic-pae #57-Ubuntu SMP Mon Feb 8 10:23:59 UTC 2010 i686 GNU/Linux

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• iterm2 emacsclient keybindings

  - by Zach

  I have just switched from using Emacs.app to emacsserver and emacsclient in terminal mode using iterm2 as my terminal emulator. I am having some trouble with some keybindings though. Particularly M-left arrow prints the character D, M-right arrow prints C, M-up arrow prints A, and M-down arrow prints B. I am using the xterm defaults for keys in iterm2 and have the left and right option keys bound to +Esc. This is particularly annoying in org-mode. Am I going to have to just rebind the keys in my .emacs? How would I go about doing that?

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• Ubuntu 12.10 sources.list empty after install

  - by Martin Nielsen

  I recently installed the Ubuntu 12.10 server version from a USB stick. The step "Install additional software" or whatever keeps failing, so i though screw it and continued. Everything else worked like a charm. I thought. Turns out, the only two entries in my sources.list are the install CD. This means that i have no way of getting a.. well.. anything installed. Can someone give me a short list of repositories that i need so i can put them in the file? And on a similar note: What is the comment character for the sources list? #?

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• Sqlite3 : "Database is locked" error

  - by Miraaj

  Hi all, In my cocoa application I am maintaining a SQLite db within resources folder and trying to do some select, delete operations in it but after some time it starts giving me 'Database is locked' error. The methods which I am using for select delete operations are as follows: // method to retrieve data if (sqlite3_open([databasePath UTF8String], &database) != SQLITE_OK) { sqlite3_close(database); NSAssert(0, @"Failed to open database"); } NSLog(@"mailBodyFor:%d andFlag:%d andFlag:%@",UId,x,Ffolder); NSMutableArray *recordsToReturn = [[NSMutableArray alloc] initWithCapacity:2]; NSString *tempMsg; const char *sqlStatementNew; NSLog(@"before switch"); switch (x) { case 9: // tempMsg=[NSString stringWithFormat:@"SELECT * FROM users_messages"]; tempMsg=[NSString stringWithFormat:@"SELECT message,AttachFileOriName as oriFileName,AttachmentFileName as fileName FROM users_messages WHERE id = (select message_id from users_messages_status where id= '%d')",UId]; NSLog(@"mail body query - %@",tempMsg); break; default: break; } sqlStatementNew = [tempMsg cStringUsingEncoding:NSUTF8StringEncoding]; sqlite3_stmt *compiledStatementNew; NSLog(@"before if statement"); if(sqlite3_prepare_v2(database, sqlStatementNew, -1, &compiledStatementNew, NULL) == SQLITE_OK) { NSLog(@"the sql is finalized"); while(sqlite3_step(compiledStatementNew) == SQLITE_ROW) { NSMutableDictionary *recordDict = [[NSMutableDictionary alloc] initWithCapacity:3]; NSString *message; if((char *)sqlite3_column_text(compiledStatementNew, 0)){ message = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatementNew, 0)]; } else{ message = @""; } NSLog(@"message - %@",message); NSString *oriFileName; if((char *)sqlite3_column_text(compiledStatementNew, 1)){ oriFileName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatementNew, 1)]; } else{ oriFileName = @""; } NSLog(@"oriFileName - %@",oriFileName); NSString *fileName; if((char *)sqlite3_column_text(compiledStatementNew, 2)){ fileName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatementNew, 2)]; } else{ fileName = @""; } NSLog(@"fileName - %@",fileName); [recordDict setObject:message forKey:@"message"]; [recordDict setObject:oriFileName forKey:@"oriFileName"]; [recordDict setObject:fileName forKey:@"fileName"]; [recordsToReturn addObject:recordDict]; [recordDict release]; } sqlite3_finalize(compiledStatementNew); sqlite3_close(database); NSLog(@"user messages return -%@",recordsToReturn); return recordsToReturn; } else{ NSLog(@"Error while creating retrieving mailBodyFor in messaging '%s'", sqlite3_errmsg(database)); sqlite3_close(database); } // method to delete data if (sqlite3_open([databasePath UTF8String], &database) != SQLITE_OK) { sqlite3_close(database); NSAssert(0, @"Failed to open database"); } NSString *deleteQuery = [[NSString alloc] initWithFormat:@"delete from users_messages_status where id IN(%@)",ids]; NSLog(@"users_messages_status msg deleteQuery - %@",deleteQuery); sqlite3_stmt *deleteStmnt; const char *sql = [deleteQuery cStringUsingEncoding:NSUTF8StringEncoding]; if(sqlite3_prepare_v2(database, sql, -1, &deleteStmnt, NULL) != SQLITE_OK){ NSLog(@"Error while creating delete statement. '%s'", sqlite3_errmsg(database)); } else{ NSLog(@"successful deletion from users_messages"); } if(SQLITE_DONE != sqlite3_step(deleteStmnt)){ NSLog(@"Error while deleting. '%s'", sqlite3_errmsg(database)); } sqlite3_close(database); Things are going wrong in this sequence Data is retrieved 'Database is locked' error arises on performing delete operation. When I retry to perform 1st step.. it now gives same error. Can anyone suggest me: If I am doing anything wrong or missing some check? Is there any way to unlock it when it gives locked error? Thanks, Miraaj

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• Objective-C(iPhone SDK) - Code for Chemical Equation Balancer help

  - by Evan

  -(IBAction) balancer: (id) sender{ double M[4][4]; M[0][0] = 6.0; M[0][1] = 0.0; M[0][2] = -1.0; M[0][3] = 0.0; M[1][0] = 12.0; M[1][1] = 0.0; M[1][2] = 0.0; M[1][3] = 2.0; M[2][0] = 6.0; M[2][1] = 2.0; M[2][2] = -2.0; M[2][3] = 1.0; M[3][0] = 0.0; M[3][1] = 0.0; M[3][2] = 0.0; M[3][3] = 0.0; int rowCount = 4; int columnCount = 4; int lead = 0; for (int r = 0; r < rowCount; r++) { if (lead = columnCount) break; int i = r; while (M[i][lead] == 0) { i++; if (i == rowCount) { i = r; lead++; if (lead == columnCount){ break; } } } double temp[4] ; temp[0] = M[r][0]; temp[1] = M[r][1]; temp[2] = M[r][2]; temp[3] = M[r][3]; M[r][0] = M[i][0]; M[r][1] = M[i][1]; M[r][2] = M[i][2]; M[r][3] = M[i][3]; M[i][0] = temp[0]; M[i][1] = temp[1]; M[i][2] = temp[2]; M[i][3] = temp[3]; double lv = M[r][lead]; for (int j = 0; j < columnCount; j++) M[r][j] = M[r][j] / lv; for (int f = 0; f < rowCount; f++) { if (f != r) { double l = M[f][lead]; for (int j = 0; j < columnCount; j++) M[f][j] = M[f][j] - l * M[r][j]; } } lead++; } NSString* myNewString = [NSString stringWithFormat:@"%g",M[0][3]]; label1.text = myNewString; } This is returning NaN, while it should be returning .16666667 for M[0][3]. Any suggestions on how to fix this?

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• Empty mails received from Plesk-driven server

  - by goreSplatter

  From my Plesk managed server I keep receiving emails addressed to the configured administrator (me). Nothing special there. These mails are sent from an empty sender with no body, no subject nor any other relevant headers. I have changed the server administrator's e-mail address to an alternate one which is then the recipient. The mails are sent at irregular intervals. With variations in the timestamp I get an email every 30 minutes. Then there's a break and two and a half hours later I get the same email. I already have turned of crond for more than a day to see if this is the source of the problem. On that server there is no "foreign" software running which would cause that behavior. I have no more guesses as to why this is happening. Any suggestions?

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• How to map command in vim that maintains mode when invoked?

  - by Phoenix

  I'm configuring vim in Mac OS X's Terminal app to do useful things with my arrow keys (among others). For example, I want option-left to move the cursor back one word, similarly to how it works in other Mac applications. In normal mode, this is easy enough; I can simply map the sequence to b. But when I'm in insert mode, I want to stay in insert mode (i.e., map the sequence to <c-o>b. In my .vimrc` file, I have these lines: nmap ^[[xol~ b imap ^[[xol~ <c-o>b Where ^[[xol~ is the character sequence that I've configured Terminal to send when I press option-left. This works, but it gets pretty tedious, especially when I've got nearly two dozen commands that I want to map. Is there a better way to do this?

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• External Hard Disk's secter could not be read ?

  - by mgpyone

  I've an 500 GB Seagate External Hard Disk (NTFS) . Currently, I can't open it at Windows. Thus, I've tired with chkdsk command .. but still it stopped and can't continue checking disk.. Also I've tired with fsck on Mac . Then, it shows me the Error .. /Volumes/<HD Name>/ is not a character device CONTINUE? yes /Volumes/<HD Name>/ (NO WRITE) CANNOT READ: BLK 16 CONTINUE? yes THE FOLLOWING DISK SECTORS COULD NOT BE READ: 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, ioctl (GCINFO): Inappropriate ioctl for device fsck: /Volumes/<HD Name>/: can't read disk label The volume I've used is around 300 GB , Thus, it's hard to back up and format again . Thus, any helpful suggestions and solutions will be appreciated pretty well.

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• Are there any program for showing tooltip via OCR

  - by Casper

  Edited for clarification based on comments: At work we have an old developed program where I need to navigate on a very long dropdown list only with numbered codes. To select the correct code, I manually look at an excel list that shows the code and the name each codes corresponds with. To make matters worse, it is not possible to type in the dropdown box (only first character is recognized when typing) So my question is: Are there any program which can show the text from a predefined list, when i mouseover the various possibilities in the dropdown list? The purpose would be to be able to identify the name which corresponds to each code, without having to look at the excel list. Thanks in advance!

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• Is it possible to edit a PDF file directly?

  - by rossmcm

  I have a PDF file that is produced as part of a help file compilation. There is always late breaking stuff which goes into a text file (e.g. "What's new in this version" type of stuff) and while Help and Manual allows you to include stuff from a text file it only works for the CHM output and not for the PDF. I'm wondering if I can do it by generating a unique placeholder string instead and then using some tool (I may need to write one) to do a search and replace of that unique string with the contents of the late breaking info text file. Is this feasible? Or will it break some sort of internal structure?

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• In windows 7, how do I disable "Ease of Access" pop ups on the logon screen as I am typing my password?

  - by Silfheed

  So the question is pretty much in the title. Things to note: 'Use On-Screen Keyboard' is un-checked I have disabled Ease of Access by replacing utilman.exe But my problem now is that when I'm typing my password, It'll stop all together on the 'u' or the 'p' character and I have to click on the ease of access button then move focus back to the password to continue. Yes, one obvious solution is to not use a password that has 'u' or 'p' in it (which I've done), but that's obviously not a completely satisfying answer. Thanks! I feel a tumbleweed badge...

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• How to reformat reStructuredText?

  - by wal-o-mat

  I'm writing reST in vim, which handles line breaks for me (after 80 chars). However, since I frequently go back and edit the text before, lines get ugly again. For example, in tables, it's sometimes annoying to re-format a complete table just because you need a line break in some place. So I wish I had a program that reads my ugly-but-correct reStructuredText and outputs it nicely formatted and wrapped. I found that pandoc in.rst -w rst mostly works, but it has some drawbacks. For example :author: John Doe becomes author John Doe and title formatting is changed as well. Sadly, there seems to be no rst2rst or something similar. Does anyone have some advice?

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• Why is my Windows XP not allowing me to turn on sounds?

  - by Rookie

  This started to happen few weeks ago: Every time I start up Windows, the global sound volume is set to muted. I was able to just click the muted button to un-muted and that was fine, until now: Now I cant even click that unmute button! Every time I click the unmute button, I hear a split of a second the music I play, then it stops immediately. It is maybe 10 milliseconds until it mutes it again. In theory I could write a program to click that button continuously, but is there another solution to fix this? Or is this a broken hardware problem and Windows knows it and therefore doesn't allow me to enable sounds or my computer would break apart? Any ideas what could be causing this? A weird virus that's purpose is to piss me off? That weird this whole issue is, really, doesn't make any sense at all.

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