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  • Faster code with another compiler

    - by Andrei
    I'm using the standard gcc compiler in math software development with C-language. I don't know that much about compilers or compiler options, and I was just wondering, is it possible to make faster executables using another compiler or choosing better options? The default Makefile sets options -ffast-math and -O3 and I think both of them have some impact in the overall calculation time. My software is using memory quite extensively, so I imagine some options related to memory management might do the trick? Any ideas?

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  • JVM terminated. Exit code = -1

    - by Lex
    Hello, I've been using Eclipse for some time already, and I didn't have any problems with it. However, when I tried to generate some javadoc, I found that I didn't have the SDK installed. I installed jdk 6u23, and from then on, Eclipse hasn't been working. At first it told me it couldn't find a JRE/SDK. After copying and placing the JRE in the Eclipse folder, the error changed to this: http://i258.photobucket.com/albums/hh261/magical_7/Eclipse.png I've searched around for some solutions, and found a few of varying nature. However, none of them seemed to work. I've tried emptying my eclipse.ini file without success. Altering some values in eclipse.ini didn't work either. Installing Java SDK 1.5 didn't work. Does anyone have other possible solutions? Update: I tried reinstalling Eclipse, but it didn't fix the problem. I did notice that it's a 32bit version, while I'm running a 64bit system. However, if this were to be the problem, I find it strange that it hasn't been an issue earlier.

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  • Is it bad practice to 'mix class and interfaces in the same package'?

    - by DerMike
    Hello, I just found something that I never heard of before and I do not agree with (by now). In an (upvoted and not further commented) answer I read "why to mix class and interfaces in the same package" So I wonder, if there are reasons to separate Interfaces and implementations in Java. I know that we are not obliged to have all implementations in the package of the interface, but is it (sometimes) wise to have none there? Regards Mike [;-)

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  • What's the bug in the following code ?

    - by Johannes
    #include <iostream> #include <algorithm> #include <vector> #include <boost/array.hpp> #include <boost/bind.hpp> int main() { boost::array<int, 4> a = {45, 11, 67, 23}; std::vector<int> v(a.begin(), a.end()); std::vector<int> v2; std::transform(v.begin(), v.end(), v2.begin(), boost::bind(std::multiplies<int>(), _1, 2)); std::copy(v2.begin(), v2.end(), std::ostream_iterator<int>(std::cout, " ")); } When run, this gives a creepy segmentation fault. Please tell me where I'm going wrong.

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  • PHP/Javascript: Restart Form Button Isn't Working, Code Insde

    - by Josh K
    Basically I want a confirmation box to pop up when they click the button asking if they sure they want to restart, if yes, then it destroys session and takes them to the first page. Heres what i got... echo "<form id=\"form\" name=\"form\" method=\"post\" action=\"nextpage.php\">\n"; echo " <input type=\"button\" name='restart' value='Restart' id='restart' onclick='restartForm()' />"; and for the script... <script type=\"text/javascript\"> <!-- function restartForm() { var answer = confirm('Are you sure you want to start over?'); if (answer) { form.action=\"firstpage.php\"; session_destroy(); form.submit(); } else alert ('Restart Cancelled'); } // -- </script>"; EDIT: Note that pressing the button brings up the confirm box, but if you click okay nothing happens sometimes. Sometimes if u click cancel it still submits the form (To the original action)

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  • how to test this portion of code

    - by Gandalf StormCrow
    Hello I'm writting junit test how can I test this method .. this is only part of this method : public MyClass{ public void myMethod(){ List<myObject> list = readData(); } } How will I make the test for this? ReadData is a private method inside MyClass?

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  • PHP getting a bunch of weird code \u0644\u064a\u0646\u0643 \u0627\u0644

    - by Webby
    Hello I'm getting a bunch of weird html output in users messages e.g. \u0644\u064a\u0646\u0643 \u0627\u0644 \u0639\u0627\u0645\u0644 I assume their aribic characters decoded? How can I perhaps preg replace all these codes with something a little more useful? because search results are filled with pages and pages of this stuff Perhaps even display them as they're supposed to be? Any advice what to do with such strings and how to implement them appreciated.. Please keep in mind this stuff is mixed in been common language letters / numbers many thanks

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  • LINQ to SQL: NOTing a prebuilt expression

    - by ck
    I'm building a library of functions for one of my core L2S classes, all of which return a bool to allow checking for certain situations. Example: Expression<Func<Account, bool>> IsSomethingX = a => a.AccountSupplementary != null && a.AccountSupplementary.SomethingXFlag != null && a.AccountSupplementary.SomethingXFlag.Value; Now to query where this is not true, I CAN'T do this: var myAccounts= context.Accounts .Where(!IsSomethingX); // does not compile However, using the syntax from the PredicateBuilder class, I've come up with this: public static IQueryable<T> WhereNot<T>(this IQueryable<T> items, Expression<Func<T, bool>> expr1) { var invokedExpr = Expression.Invoke(expr1, expr1.Parameters.Cast<Expression>()); return items.Where(Expression.Lambda<Func<T, bool>> (Expression.Not(invokedExpr), expr1.Parameters)); } var myAccounts= context.Accounts .WhereNot(IsSomethingX); // does compile which actually produces the correct SQL. Does this look like a good solution, and is there anything I need to be aware of that might cause me problems in future?

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  • [help]Website Process Code

    - by user1915555
    i am new to here...i want a big help...help me...:d look at this website link and go through the procces and download the pdf or text file... http://www.doyourownwill.com/do-your-will-online.html and tell me how to do that plz....this is a big help to me..plz help me..:d when you are going through the proces u can see the link like this... http://www.doyourownwill.com/do-your-will/case-2.html?step=2 tell me how to do that...plz before give the answers watch the full process of that site... I am waiting for great reply...:d

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  • How to view doctype in generated source code

    - by wcpro
    I am using an XSL transformation on an xml file to create an xml document. The problem i am running into is that when i go to view the generated source (the transformed source) i can't see the DOCTYPE attribute of the html so i don't know if its being emitted properly. Is there any way to view the doctype in this way?

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  • whats wrong with this piece of code for saving contacts

    - by Shadow
    Hi, i am using the latest Nokia Qt SDK. i have tried to add the contacts, its not getting added.. what is missing here.. // Construct contact manager for default contact backend QContactManager* cm = new QContactManager("simulator"); // QContactManager* cm = new QContactManager("memory"); // i tried this, its also not working // Create example contact QContact example; // Add contact name QContactName name; name.setFirstName("John"); name.setLastName("Doe"); example.saveDetail(&name); // Add contact email address //QContactEmailAddress email; // email.setContexts(QContactDetail::ContextHome); //email.setEmailAddress(“[email protected]”); // example.saveDetail(&email); // Finally, save the contact details cm->saveContact(&example); delete cm; Thanks

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  • Where is the error in my code?

    - by Lulu Larson
    /** Yields: a String that contains each capital Letter (in 'A'..'Z') whose representation is prime */ public static String primeChars() { String s = ""; // inv: s contains each capital in "A'..c-1 whose representation is prime for (char c = 'A'; c <= 'Z'; c=(char)(c+1)) { if (Loops.isPrime((int)c) == true) { s= s+1; } } // s contains each capital in 'A' ..'Z' whose rep is a prime return s; }

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  • Windows batch file: Pipe destroys my return code

    - by murxx
    Hi, is it possible to return the errorlevel also if I pipe the output of a script into a logfile: test1.bat: call test2.bat 2>&1 | tee log.txt echo ERRORLEVEL: %ERRORLEVEL% test2.bat: exit /B 1 Output when calling test1.bat: ERRORLEVEL: 0 The errorlevel is always 0. The problem is, I want to call another script inside my script where the output should be redirected synchronously with the output shown in the command line, therefore a simple is not enough for me. I tried several ideas, but result is that the pipe always seems to destroy the given error-level... :( Can you give me any further suggestions? Thanks in advance... :)

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  • Subsonic3 pre-generate code files

    - by silverfox1948
    I need to pre-generate my active record files, rather than have subsonic build them dynamically. I used to be able to do this using SubSonicCentral in SubSonic 2.x. How do I do this in SubSonic 3? I don't see a generator executable when I download the 3.0.0.4 zip file.

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  • How to customize JBoss AS7 404 page

    - by user23308
    I already created a custom 404 page inside my web app deployed in JBoss AS 7.1. So if my app is at fubar dot com :8080/Myapp and I go to fubar dot com :8080/Myapp/xyzzy, I get the custom error page (defined in the web app's web.xml file). However, when I go to fubar dot com :8080/xyzzy, JBoss displays the default 404 page which discloses that it's JBoss and which JBoss version. I need to replace this page in order to hide this information. Please advise.

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  • Codeigniter error logs show a 404 non-existing images directory...need to worry?

    - by user342199
    I've recently started logging my errors through codeIgniter. Since doing so, I have noticed a lot of 404 errors for directories that don't exist. For example: ERROR - 2010-05-15 21:06:26 -- 404 Page Not Found -- someController/images Where someController is, obviously, a controller. The problem is, there are no functions within that controller called images, nor are there any links to a directory by that name. Could this be that someone is trying to hack my site? If so, do I need to worry? If not, why is this happening? Thanks, and forgive the newby-ness.

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  • Function return type style

    - by JB
    I'm learning c++0x, at least the parts supported by the Visual C++ Express 2010 Beta. This is a question about style rather than how it works. Perhaps it's too early for style and good practice to have evolved yet for a standard that isn't even released yet... In c++0x you can define the return type of a method using - type at the end of the function instead of putting the type at the start. I believe this change in syntax is required due to lambdas and some use cases of the new decltype keyword, but you can use it anywhere as far as I know. // Old style int add1(int a, int b) { return a + b; } // New style return type auto add2(int a, int b) -> int { return a + b; } My question really then, is given that some functions will need to be defined in the new way is it considered good style to define all functions in this way for consistency? Or should I stick to only using it when necessary?

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