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  • JAVA. Writing a matrix in a file using column information.

    - by Dmitry
    Hello, everybody! I have a file in which a matrix is stored. This file has a RandomAccessFile type. This matrix is stored by columns. I mean that in an i-th row of this matrix an i-th column (of a real matrix) is stored. There is an example: i-th row: 1 2 3 4 (in the file). That means that the real matrix has an i-th column: (1 2 3 4)(transpose). I need to save this matrix in natural way (by rows) in a new file, which I will then open with FileReader and display with TestArea. DO you know, how to do that? If so, please help =)

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  • How would I implement separate databases for reading and writing operations?

    - by Matt
    I am interested in implementing an architecture that has two databases one for read operations and the other for writes. I have never implemented something like this and have always built single database, highly normalised systems so I am not quite sure where to begin. I have a few parts to this question. 1. What would be a good resource to find out more about this achitecture? 2. Is it just a question of replicating between two identical schemas, or would your schemas differ depending on the operations, would normalisation vary too? 3. How do you insure that data written to one database is immediately available for reading from the second? Any further help, tips, resources would be appreciated. Thanks.

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  • Is there a method / system / program to keep track of diffirent stages and changes in writing the co

    - by Luay
    forgive me, but I don't know the technical term to know what to search for. I am trying to find a way to keep track of changes in my code during the development of my program. something that would allow me to go back to a section of code that I deleted. I am not talking about "undo". But rather a way that would let me keep track or be able to retrieve a section of my code that I deleted but now want it back. Is there such a way. If there is, then what is this whole system/procedure called? Is there something that integrates with visual studio 2010? Many thanks for your help.

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  • Are there any good books on writing commercial quality software?

    - by Andy
    Hey, My background has been generally new technology demonstrators, which, well... demonstrate the latest technology and how it can be of use to a clients company. They use it for internal demos etc. Now my career has shiffed course a bit more into actual products, in particular software which runs in locations like museums as interactive pieces. Clearly, although the technology demonstrators had to be well coded etc, there wasn't as much emphasis as there is on my current work, which has to work, be highly configurable, probably multi-ligual and run constantly, without restarts. So my question is, now that I'm trying to up my coding quality and write more commercial applications, are there any books which discuss issues surrounding high quality commercial software? I currently have a copy of Code Complete 2nd Edition, which is excellent, but just wondering if there's any better, possibly more focused titles out there? Thanks a lot! Andy.

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  • Why do I need to close fds when reading and writing to the pipe?

    - by valentimsousa
    However, what if one of my processes needs to continuously write to the pipe while the other pipe needs to read? This example seems to work only for one write and one read. I need multi read and write void executarComandoURJTAG(int newSock) { int input[2], output[2], estado, d; pid_t pid; char buffer[256]; char linha[1024]; pipe(input); pipe(output); pid = fork(); if (pid == 0) {// child close(0); close(1); close(2); dup2(input[0], 0); dup2(output[1], 1); dup2(output[1], 2); close(input[1]); close(output[0]); execlp("jtag", "jtag", NULL); } else { // parent close(input[0]); close(output[1]); do { read(newSock, linha, 1024); /* Escreve o buffer no pipe */ write(input[1], linha, strlen(linha)); close(input[1]); while ((d = read(output[0], buffer, 255))) { //buffer[d] = '\0'; write(newSock, buffer, strlen(buffer)); puts(buffer); } write(newSock, "END", 4); } while (strcmp(linha, "quit") != 0); } }

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  • How does one go about writing a virtual MIDI interface?

    - by Alex
    I want to do some funky things with controlling MIDI streams, and I'd like to be able to pipe MIDI input into an application like Ableton or Reason. Presumably this involves some sort of driver level work? Ultimately I'd like to write my application in Python, so if there is some Python-based solution, I'd consider it. I'm perfectly fine with using C/C++, though, so that's not a problem.

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  • Saving core data in a thread, how to ensure its done writing before quitting?

    - by Shizam
    So I'm saving small images to core data which take a really short amount of time to save, like .2 seconds but I'm doing it while the user is flipping through a scroll view so in order to improve responsiveness I'm moving the saving to a thread. This works great, everything gets saved and the app is responsive. However, there is one thing in the core-data + multithreading doco that worries me: "In Cocoa, only the main thread is not-detached. If you need to save on other threads, you must write additional code such that the main thread prevents the application from quitting until all the save operation is complete." Ok, how do you do that? It only needs to last ~ .2 seconds and its rarely going to happen since the chance of the app quitting as something is saving is very low. How do I run something on the main thread that'll prevent the app from quitting AND not block the gui? Thanks

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  • im writing this code so the user would enter his/her name and followed by his/her marks to get the a

    - by WM
    What if the user wanted to enter his/her grades in the following way: Will 23, 34, 45, 45 how would i get rid of the commas public class StudentAverage { public static void main(String[] args) { int markSum = 0; double average = 0; Scanner input1 = new Scanner(System.in); System.out.print("Enter student record : "); String name = input1.next(); Scanner input2 = new Scanner(input1.nextLine()); int countTotal = 0; while (input2.hasNextInt()) { countTotal++; markSum += input2.nextInt(); } average = markSum / countTotal; // to calculate the total average System.out.print( name + " " + average ); } }

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  • Programming in Python; writing a Caesar Cipher using a zip() method

    - by user1068153
    I'm working on a python program for homework and the problem asks me to develop a program that encrypts a message using a caesar cipher. I need to be able to have the user input a number to shift the encryption by, such as 4: e.g. 'A' to 'E'. The user also needs to input the string to be translated. The book says to use a zip() to do the problem. I am confused on how I would do this though. I have this but it doesn't do anything >>>def ceasarCipher(string, shift): strings = ['abc', 'def'] shifts = [2,3] for string, shift in zip(strings, shifts): print ceasarCipher(string,shift) >>>string = 'hello world' >>>shift = 1

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  • Java. Writing a matrix in a file using column information. ( matrix transposition )

    - by Dmitry
    Hello, everybody! I have a file in which a matrix is stored. This file has a RandomAccessFile type. This matrix is stored by columns. I mean that in an i-th row of this matrix an i-th column (of a real matrix) is stored. There is an example: i-th row: 1 2 3 4 (in the file). That means that the real matrix has an i-th column: (1 2 3 4)(is transposed). I need to save this matrix in a natural way (by rows) in a new file, which I will then open with FileReader and display with TextArea. Do you know, how to do that? If so, please help =)

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  • Writing a program which uses voice recogniton... where should I start?

    - by Katsideswide
    Hello! I'm a design student currently dabbling with Arduino code (based on c/c++) and flash AS3. What I want to do is to be able to write a program with a voice control input. So, program prompts user to spell a word. The user spells out the word. The program recognizes if this is right, adds one to a score if it's correct, and corrects the user if it's wrong. So I'm seeing a big list of words, each with an audio file of the word being read out, with the voice recognition part checking to see if the reply matches the input. Ideally i'd like to be able to interface this with an Arduino microcontroller so that a physical output with a motor could be achieved in reaction also. Thing is i'm not sure if I can make this program in flash, in Processing (associated with arduino) or if I need another CS3 program-making-program. I guess I need to download a good voice recognizing program, but how can I interface this with anything else? Also, I'm on a mac. (not sure if this makes a difference) I apologize for my cluelessness, any hints would be great! -Susan

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  • How to have synchronous writing to a file (Threads) ?

    - by bobby
    Hi all. I created and started some Threads that each one writes something to a common text file. but the following error appears to me: "The process cannot access the file 'C:\hello.txt' because it is being used by another process." void AccessFile() { int num = 5; Thread[] trds = new Thread[5]; for (int i = 0; i < num; i++) { trds[i] = new Thread(new ParameterizedThreadStart(WriteToFile)); } for (int i = 0; i < num; i++) { trds[i].Start(String.Format("{0}: Hello from thread id:#{1}", i, trds[i].ManagedThreadId)); } } void WriteToFile(object message) { string FileName = "C:\\hello.txt"; string mess = (string)message; System.IO.StreamWriter sw = null; FileStream objStream = null; sw = File.AppendText(FileName); if (sw == null) { objStream = new FileStream(FileName, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite); sw = new StreamWriter(objStream); } sw.WriteLine(mess); sw.Close(); sw.Dispose(); } the AccessFile() method is the starting point. could any one tell me what should i do?

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  • Writing string, numeric data to Excel via C# works, but Excel does not treat numeric data correctly

    - by Chapax
    Hi, I'm getting result sets from Sybase that I return to a C# client. I use the below function to write the result set data to Excel: ***private static void WriteData(Excel.Worksheet worksheet, string cellRef, ref string[,] data) { Excel.Range range = worksheet.get_Range(cellRef, Missing.Value); if (data.GetLength(0) != 0) { range = range.get_Resize(data.GetLength(0), data.GetLength(1)); range.set_Value(Missing.Value, data); } }* The data gets written correctly. The issue is that since I'm using string array to write data (which is a mixture of strings and floats), Excel highlights every cell that contains numeric data with the message "Number Stored as Text". How do I get rid of this issue? Many thanks, Chapax

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  • connection.setRequestProperty and excplicitly writing to the urloutputstream are they same ?

    - by Bunny Rabbit
    URL url = new URL("http://www.example.com/comment"); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setDoOutput(true); connection.setRequestMethod("POST"); Is connection.setRequestProperty(key, value); same as OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream()); writer.write("key=" + value); writer.close(); if not please correct me .

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  • Why are some programs writing on stderr instead of stdout their output?

    - by Zagorax
    I've recently added to my .bashrc file an ssh-add command. I found that ssh-add $HOME/.ssh/id_rsa_github > /dev/null results on a message "identity added and something else" every time I open a shell. While ssh-add $HOME/.ssh/id_rsa_github > /dev/null 2>&1 did the trick and my shell is now 'clean'. Reading on internet, I found that other command do it, (for example time). Could you please explain why it's done?

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  • How would I go about writing a conditional statement to check if visitor is coming from a particular

    - by Matthew
    Hello guys, What I have in mind is this... We are going to have people come from a particular site during a acquisition campaign and was wondering how I could conditionalize a certain section of my site to display a thank you message instead of the sign up form as they would have had the opportunity to fill this out before coming to my landing page. I have seen solutions like: $referal = mysql_real_escape_string($_SERVER['HTTP_REFERER']); I would like to know if this is the best way to get this to work??? - okay this is what i think might work. The third party website that is referring people to our landing page once the form on that site has been filled out can push into the record a hidden input value of "www.sample.com" or whatever... then I can have something check the for that particular value and fire off the conidtional. Does that even sound right?

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  • What is a way to access .accdb files for reading and writing?

    - by JPJedi
    I have an Microsoft Access Database (.accdb) that stores information needed in an application. Is there a way to distribute my application with the access database without having the user have access installed or get the user to go and download and install the office runtime? The windows form application that uses the access database is developed in VB.net in Visual Studio 2008.

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  • How can I go about writing to the console in fasm?

    - by codinggoose
    The code I currently have can be found at: http://fasm.pastebin.com/yY3C0aVF I'm exceptionally new to assembly, only picked it up yesterday and I've looked through many an example and still can't figure out for myself how to write to the console. I always get an error when I seem to replicate it in my own way. If I'm not on the right track at all please let me know, also if you can suggest a good book on fasm it would be greatly appreciated.

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