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  • What are best practices for testing programs with stochastic behavior?

    - by John Doucette
    Doing R&D work, I often find myself writing programs that have some large degree of randomness in their behavior. For example, when I work in Genetic Programming, I often write programs that generate and execute arbitrary random source code. A problem with testing such code is that bugs are often intermittent and can be very hard to reproduce. This goes beyond just setting a random seed to the same value and starting execution over. For instance, code might read a message from the kernal ring buffer, and then make conditional jumps on the message contents. Naturally, the ring buffer's state will have changed when one later attempts to reproduce the issue. Even though this behavior is a feature it can trigger other code in unexpected ways, and thus often reveals bugs that unit tests (or human testers) don't find. Are there established best practices for testing systems of this sort? If so, some references would be very helpful. If not, any other suggestions are welcome!

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  • How to make bash script run with a latency (i.e. wait 1 sec at each iterations)?

    - by user2413
    I have this bash script; for (( i = 1 ; i <= 160 ; i++ )); do qsub myccomputations"${i}".pbs done Basically, I would prefer if there was a 1 second delay between each iteration. The reason is that at each iterations, it sends the program file mycomputation"${i}$.pbs to a core node for solving. Solving in this instance involves the use of pseudo random numbers. I suspect the RNG I use (R's) uses CPU time as seed because as things are now I get repeating pseudo random numbers (at the rate of approx 1 out of 100). So how to you ask bash to for (( i = 1 ; i <= 160 ; i++ )); do wait 1 sec qsub myccomputations"${i}".pbs done

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  • Are there references discussing the use parallel programming as a development methodology? [closed]

    - by ahsteele
    I work on a team which employs many of the extreme programming practices. We've gone to great lengths to utilize paired programming as much as possible. Unfortunately the practice sometimes breaks down and becomes ineffective. In looking for ways to tweak our process I came across two articles describing parallel pair programming: Parallel Pair Programming Death of paired programming. Its 2008 move on to parallel pairing While these are good resources I wanted to read a bit more on the topic. As you can imagine Googling for variations on parallel pair programming nets mostly results which relate to parallel programming. What I'm after is additional discussion on the topic of parallel pair programming. Do additional references exist that my Google-fu is unable to discern? Has anyone used the practice and care to share here (thus creating a reference)?

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  • Places to find free software projects who need developers/project managers?

    - by MHarrison
    While I have plenty of project management "booksmarts" and a handful of PM experience, I don't seem to have enough experience to get the sort of job I want. Since "I read another PM book/blog today" doesn't really count, I was thinking I could find some free/open source software (FOSS) projects who are looking for/hiring project managers or developers and see if there was anything I could volunteer for. Does anyone know of any FOSS employment sites where I might be able to find such projects? Something similar to careers.stackoverflow.com. I know I could just go to sourceforge/freshmeat and look around, but I was hoping to find some site that fills this need (and if any such sites exist, my google-fu is apparently VERY weak at finding them).

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  • Generating Wrappers for REST APIs

    - by Kyle
    Would it be feasible to generate wrappers for REST APIs? An earlier question asked about machine readable descriptions of RESTful services addressed how we could write (and then read) API specifications in a standardized way which would lend itself well to generated wrappers. Could a first pass parser generate a decent wrapper that human intervention could fix up? Perhaps the first pass wouldn't be consistent, but would remove a lot of the grunt work and make it easy to flesh out the rest of the API and types. What would need to be considered? What's stopping people from doing this? Has it already been done and my google fu is weak for the day?

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  • Permissions depending on parameters passed to application

    - by Engineiro
    I have a java app that writes to a very important table I have. This is sudo protected, but this app takes a parameters for where the output should go. The default is the REAL DEAL but the "output" parameter takes priority over the default, so if a user provides a path that they have write permission for, say: /home/username/mystuff then I would like for users to be allowed to write to these directories. The app is launched in a shell script, so I am wondering if I can check that the string does not equal /path/to/real/deal and not empty (since /path/to/real/deal is the default) and allow users to write to places they have permissions for. My impression of linux permissions is that it is tied to the application itself and cannot be conditionally approved, but I wonder if there is some bash fu or alternative method I can perform to get me my desired result. Using Ubuntu 10.04.4 LTS

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  • Can Google Translate's audio files be used in a game?

    - by ashes999
    For my game, I need text-to-speech. Since it's Android, I decided to settle for MP3s, since the range of words spoken is few. For my prototype, I'm using Google Translate to generate the audio since it has awesome pronounciation across multiple languages. But can I use it in production? What if I sell my game for $1 on the app store? All I can find on SE is that the API may be LGPL, and that the licensing page mentions the API is only available for academic research -- nothing more. My usage is a bit different; I'm actually capturing the audio bits and using those instead. I'm curious to know the license for this; I can't find anything with my Google-fu.

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  • How to create reproducible probability in map generation?

    - by nickbadal
    So for my game, I'm using perlin noise to generate regions of my map (water/land, forest/grass) but I'd also like to create some probability based generation too. For instance: if(nextInt(10) > 2 && tile.adjacentTo(Type.WATER)) tile.setType(Type.SAND); This works fine, and is even reproduceable (based on a common seed) if the nextInt() calls are always in the same order. The issue is that in my game, the world is generated on demand, based on the player's location. This means, that if I explore the map differently, and the chunks of the map are generated in a different order, the randomness is no longer consistent. How can I get this sort of randomness to be consistent, independent of call order? Thanks in advance :)

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  • Should single purpose utility app use a class

    - by jmoreno
    When writing a small utility app, that does just one thing, should that one thing be encapsulated in a seperate class, or just let it be part of whatever class/module is used to start the application? I.e. Main would consist of 2 or three lines calling the constructor and then the DoIt methods, nothing else. Or should Main be the DoIt method, with whatever functions it needs added to the main class? Asking because I want to get some alternative perspective, but couldn't find a similar question. If my google-fu is bad and there's a dup, please close.

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  • Generate Unique Abstract Backgrounds with Ablaze

    - by Jason Fitzpatrick
    If you want custom and unique backgrounds without having to code your own image-generating engine, Ablaze makes it simple (and fun) to create abstract images. You can customize a wide array of options in Ablaze including the base shape (ring, horizontal line, or random), number of particles, distance each particle travels, and the speed (if you increase the speed range you get more distinct lines and if you decrease it you get smoother smokier shapes). You can also seed the design with a color palette pulled from any image you provide (the sample above was seeded with a Wonder Woman comic panel). Tweak and reset the pattern generation as much as you want; when you create an abstract image worthy of your desktop just click the save button to grab a copy of it in PNG format. Ablaze [via Flowing Data] How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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  • Where to generate data in an Entity-Component System?

    - by Mark Mandel
    So I'm making a small game where I generate 2D landscape using perlin noise when the game first loads. I've got it working in a OO way, but want to move over to an ES architecure, and I'm just struggling to work out the right place for the code that does the generation to go? In OO world, I have a World object which gets passes a coordinate value that is used as the seed for the perlin noise, and generates all the points for the land mass when the world is created. I'm thinking I need a World component with a coordinate field on it - that's an easy part. From there - is it right for a component to generate data when it's first initialised (or is that too OO?)? Or should a System be doing that instead, when the game first starts? Or... some other solution I'm not aware of? Thanks in advance for any guidance.

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  • PHP error log does not display script names nor does it display the errors' line numbers [migrated]

    - by gnxtech3
    I think the title is self-explanatory, and my Google-fu isn't bringing up anything useful. I'm working on a new host, and my php error log only displays the error itself, not which script is the offender, nor which line number the error is occurring on. Makes it a tad difficult to debug, especially since there's only 1 error in the script. More info: I'm not using a custom error handler that I'm aware of. This is a standard Wordpress install. The error was [27-Aug-2012 19:22:36 UTC] PHP NOTICE: Trying to get property of non-object. Just no script name or line number in the error I found that Wordpress' error logging contained the information to debug the problem, but that doesn't explain why the log didn't contain line number or script.

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  • Conversion from YUV444 to RGB888

    - by Abhi
    I am new in this field and i desperately need some guidance from u all. I have to support yuv444 to rgb 888 in display driver module. There is one test which i have done for yv12 → rgb565 in wince 6.0 r3 which is mentioned below. //------------------------------------------------------------------------------ // // Function: PP_CSC_YV12_RGB565Test // // This function tests the Post-processor // // // // Parameters: // uiMsg // [in] Ignored. // // tpParam // [in] Ignored. // // lpFTE // [in] Ignored. // // Returns: // Specifies if the test passed (TPR_PASS), failed (TPR_FAIL), or was // skipped (TPR_SKIP). // // TESTPROCAPI PP_CSC_YV12_RGB565Test(UINT uMsg, TPPARAM tpParam, LPFUNCTION_TABLE_ENTRY lpFTE) { LogEntry(L"%d : In %s Function \r\n",++abhineet,__WFUNCTION__); UNREFERENCED_PARAMETER(tpParam); UNREFERENCED_PARAMETER(lpFTE); DWORD dwResult= TPR_SKIP; ppConfigData ppData; DWORD iInputBytesPerFrame, iOutputBytesPerFrame; UINT32 iInputStride, iOutputStride; UINT16 iOutputWidth, iOutputHeight, iOutputBPP; UINT16 iInputWidth, iInputHeight, iInputBPP; int iOption; PP_TEST_FUNCTION_ENTRY(); // Validate that the shell wants the test to run if (uMsg != TPM_EXECUTE) { return TPR_NOT_HANDLED; } PPTestInit(); iInputWidth = PP_TEST_FRAME_WIDTH; //116 iInputHeight = PP_TEST_FRAME_HEIGHT; //160 iInputBPP = PP_TEST_FRAME_BPP; //2 iInputStride = iInputWidth * 3/2; // YV12 is 12 bits per pixel iOutputWidth = PP_TEST_FRAME_WIDTH; iOutputHeight = PP_TEST_FRAME_HEIGHT; iOutputBPP = PP_TEST_FRAME_BPP; iOutputStride = iOutputWidth * iOutputBPP; // Allocate buffers for input and output frames iInputBytesPerFrame = iInputStride * iInputHeight; pInputFrameVirtAddr = (UINT32 *) AllocPhysMem(iInputBytesPerFrame, PAGE_EXECUTE_READWRITE, 0, 0, (ULONG *) &pInputFramePhysAddr); iOutputBytesPerFrame = iOutputStride * iOutputHeight; pOutputFrameVirtAddr = (UINT32 *) AllocPhysMem(iOutputBytesPerFrame, PAGE_EXECUTE_READWRITE, 0, 0, (ULONG *) &pOutputFramePhysAddr); if ((NULL == pInputFrameVirtAddr) || (NULL == pOutputFrameVirtAddr)) { dwResult = TPR_FAIL; goto PP_CSC_YV12_RGB565Test_clean_up; } //----------------------------- // Configure PP //----------------------------- // Set up post-processing configuration data memset(&ppData, 0 , sizeof(ppData)); // Set up input format and data width ppData.inputIDMAChannel.FrameFormat = icFormat_YUV420; ppData.inputIDMAChannel.DataWidth = icDataWidth_8BPP; // dummy value for YUV ppData.inputIDMAChannel.PixelFormat.component0_offset = 0; ppData.inputIDMAChannel.PixelFormat.component1_offset = 8; ppData.inputIDMAChannel.PixelFormat.component2_offset = 16; ppData.inputIDMAChannel.PixelFormat.component3_offset = 24; ppData.inputIDMAChannel.PixelFormat.component0_width = 8-1; ppData.inputIDMAChannel.PixelFormat.component1_width = 8-1; ppData.inputIDMAChannel.PixelFormat.component2_width = 8-1; ppData.inputIDMAChannel.PixelFormat.component3_width = 8-1; ppData.inputIDMAChannel.FrameSize.height = iInputHeight; ppData.inputIDMAChannel.FrameSize.width = iInputWidth; ppData.inputIDMAChannel.LineStride = iInputWidth; // Set up output format and data width ppData.outputIDMAChannel.FrameFormat = icFormat_RGB; ppData.outputIDMAChannel.DataWidth = icDataWidth_16BPP; ppData.outputIDMAChannel.PixelFormat.component0_offset = RGB_COMPONET0_OFFSET; ppData.outputIDMAChannel.PixelFormat.component1_offset = RGB_COMPONET1_OFFSET; ppData.outputIDMAChannel.PixelFormat.component2_offset = RGB_COMPONET2_OFFSET; ppData.outputIDMAChannel.PixelFormat.component3_offset = RGB_COMPONET3_OFFSET; ppData.outputIDMAChannel.PixelFormat.component0_width = RGB_COMPONET0_WIDTH -1; ppData.outputIDMAChannel.PixelFormat.component1_width = RGB_COMPONET1_WIDTH -1; ppData.outputIDMAChannel.PixelFormat.component2_width = RGB_COMPONET2_WIDTH -1; ppData.outputIDMAChannel.PixelFormat.component3_width = RGB_COMPONET3_WIDTH; ppData.outputIDMAChannel.FrameSize.height = iOutputHeight; ppData.outputIDMAChannel.FrameSize.width = iOutputWidth; ppData.outputIDMAChannel.LineStride = iOutputStride; // Set up post-processing channel CSC parameters // based on input and output ppData.CSCEquation = CSCY2R_A1; ppData.inputIDMAChannel.UBufOffset = iInputHeight * iInputWidth + (iInputHeight * iInputWidth)/4; ppData.inputIDMAChannel.VBufOffset = iInputHeight * iInputWidth; ppData.FlipRot.verticalFlip = FALSE; ppData.FlipRot.horizontalFlip = FALSE; ppData.FlipRot.rotate90 = FALSE; if (!PPConfigure(hPP, &ppData)) { dwResult = TPR_FAIL; goto PP_CSC_YV12_RGB565Test_clean_up; } //----------------------------- // Read first input buffer //----------------------------- // Read Input file for new frame if (!ReadImage(PP_TEST_YV12_FILENAME,pInputFrameVirtAddr,iInputBytesPerFrame,PP_TEST_FRAME_WIDTH,PP_TEST_FRAME_HEIGHT)) { g_pKato->Log(PP_ZONE_ERROR, (TEXT("fail to ReadImage()!\r\n"))); dwResult = TPR_FAIL; goto PP_CSC_YV12_RGB565Test_clean_up; } //----------------------------- // Start PP //----------------------------- if (!PPStart(hPP)) { dwResult = TPR_FAIL; goto PP_CSC_YV12_RGB565Test_clean_up; } if (!PPInterruptEnable(hPP, FRAME_INTERRUPT)) { dwResult = TPR_FAIL; goto PP_CSC_YV12_RGB565Test_clean_up; } //----------------------------- // Queue Input/Output Buffers //----------------------------- UINT32 starttime = GetTickCount(); // Add input and output buffers to PP queues. if (!PPAddInputBuffer(hPP, (UINT32) pInputFramePhysAddr)) { dwResult = TPR_FAIL; goto PP_CSC_YV12_RGB565Test_clean_up; } if (!PPAddOutputBuffer(hPP,(UINT32) pOutputFramePhysAddr)) { dwResult = TPR_FAIL; goto PP_CSC_YV12_RGB565Test_clean_up; } if (!PPWaitForNotBusy(hPP, FRAME_INTERRUPT)) { dwResult = TPR_FAIL; goto PP_CSC_YV12_RGB565Test_clean_up; } RETAILMSG(1, (TEXT("===========FLIP TIME: %dms====== \r\n"), GetTickCount()-starttime)); //----------------------------- // Stop PP //----------------------------- if (!PPStop(hPP)) { dwResult = TPR_FAIL; goto PP_CSC_YV12_RGB565Test_clean_up; } if (!PPClearBuffers(hPP)) { dwResult = TPR_FAIL; goto PP_CSC_YV12_RGB565Test_clean_up; } ShowRGBContent((UINT8 *) pOutputFrameVirtAddr, PP_TEST_FRAME_WIDTH, PP_TEST_FRAME_HEIGHT); iOption = MessageBox( NULL,TEXT("After CSC(YV12->RGB565). Is it correct?"),TEXT("Test result"),MB_YESNO ); if ( IDNO == iOption ) { dwResult = TPR_FAIL; } else { dwResult = TPR_PASS; } PP_CSC_YV12_RGB565Test_clean_up: if(NULL != pInputFrameVirtAddr) { FreePhysMem( pInputFrameVirtAddr ); pInputFrameVirtAddr = NULL; } if(NULL != pOutputFrameVirtAddr) { FreePhysMem( pOutputFrameVirtAddr ); pOutputFrameVirtAddr = NULL; } PPTestDeInit(); LogEntry(L"%d :Out %s Function \r\n",++abhineet,__WFUNCTION__); return dwResult; } The below is the flow for this function. It tells the start and end of this test. *** vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv *** TEST STARTING *** *** Test Name: PP CSC(YV12-RGB565) Test *** Test ID: 500 *** Library Path: pp_test.dll *** Command Line: *** Kernel Mode: Yes *** Random Seed: 24421 *** Thread Count: 0 *** vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv *******Abhineet-PPTEST : 338 : In ShellProc Function *******Abhineet-PPTEST : 339 : In Debug Function PP_TEST: ShellProc(SPM_BEGIN_TEST, ...) called *******Abhineet-PPTEST : 340 :Out Debug Function BEGIN TEST: "PP CSC(YV12-RGB565) Test", Threads=0, Seed=24421 *******Abhineet-PPTEST : 341 :Out ShellProc Function *******Abhineet-PPTEST : 342 : In PP_CSC_YV12_RGB565Test Function PP_CSC_YV12_RGB565Test *******Abhineet-PPTEST : 343 : In PPTestInit Function *******Abhineet-PPTEST : 344 : In GetPanelDimensions Function *******Abhineet-PPTEST : 345 :Out GetPanelDimensions Function GetPanelDimensions: width=1024 height=768 bpp=16 *******Abhineet-PPTEST : 346 :Out PPTestInit Function *******Abhineet-PPTEST : 347 : In ReadImage Function RELFSD: Opening file flags_112x160.yv12 from desktop *******Abhineet-PPTEST : 348 :Out ReadImage Function ===========FLIP TIME: 1ms====== *******Abhineet-PPTEST : 349 : In ShowRGBContent Function *******Abhineet-PPTEST : 350 :Out ShowRGBContent Function *******Abhineet-PPTEST : 351 : In PPTestDeInit Function *******Abhineet-PPTEST : 352 :Out PPTestDeInit Function *******Abhineet-PPTEST : 353 :Out PP_CSC_YV12_RGB565Test Function *******Abhineet-PPTEST : 354 : In DllMain Function *******Abhineet-PPTEST : 355 :Out DllMain Function *******Abhineet-PPTEST : 356 : In ShellProc Function *******Abhineet-PPTEST : 357 : In Debug Function PP_TEST: ShellProc(SPM_END_TEST, ...) called *******Abhineet-PPTEST : 358 :Out Debug Function END TEST: "PP CSC(YV12-RGB565) Test", PASSED, Time=6.007 *******Abhineet-PPTEST : 359 :Out ShellProc Function *** ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ *** TEST COMPLETED *** *** Test Name: PP CSC(YV12-RGB565) Test *** Test ID: 500 *** Library Path: pp_test.dll *** Command Line: *** Kernel Mode: Yes *** Result: Passed *** Random Seed: 24421 *** Thread Count: 1 *** Execution Time: 0:00:06.007 *** ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Please help me out to make changes to the above function for yuv444-rgb888.

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  • Android Eclipse Plugin: Instrumentation Test Runner not specified.

    - by Rob Stevenson-Leggett
    I'm getting this error when trying to run unit tests from Eclipse with an Android Project. The list of Instrumentation Test Runners is empty in the Android preferences. [2009-06-17 23:57:51 - MyApp] ERROR: Application does not specify a android.test.InstrumentationTestRunner instrumentation or does not declare uses-library android.test.runner Google-fu failing me. It's also annoyingly decided that because I tried to run a unit test once, that's what I always want to do... Grr

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  • Java properties - .properties files vs xml?

    - by pg-robban
    I'm a newbie when it comes to properties, and I read that XML is the preferred way to store these. I noticed however, that writing a regular .properties file in the style of foo=bar fu=baz also works. This would mean a lot less typing (and maybe easier to read and more efficient as well). So what are the benefits of using an XML file?

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  • Code Golf: MSM Random Number Generator

    - by Vivin Paliath
    The challenge The shortest code by character count that will generate (pseudo)random numbers using the Middle-Square Method. The Middle-Square Method of (pseudo)random number generation was first suggested by John Von Neumann in 1946 and is defined as follows: Rn+1 = mid((Rn)2, m) For example: 34562 = 11943936 mid(11943936) = 9439 94392 = 89094721 mid(89094721) = 0947 9472 = 896809 mid(896809) = 9680 96802 = 93702400 mid(93702400) = 7024 Test cases: A seed of 8653 should give the following numbers (first 10): 8744, 4575, 9306, 6016, 1922, 6940, 1636, 6764, 7516, 4902

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  • Grails build-test-data

    - by bsreekanth
    Hello, Is it advisable to use the build-test-data plugin to load the bootstrap (seed/initial) data for an application. The plugin tutorial is excellent at http://bitbucket.org/tednaleid/grails-test-data/wiki/Home , but only mention about loading test data. There is a section about TestDataConfig , which allows to set default data. But is it a viable option if the data needs to persist in a larger scale, with complex relations.\ thanks.

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  • Random numbers from -10 to 10 in C++

    - by Chris_45
    How does one make random numbers in the interval -10 to 10 in C++ ? srand(int(time(0)));//seed for(int i = 0; i < size; i++){ myArray[i] = 1 + rand() % 20 - 10;//this will give from -9 to 10 myArray2[i] =rand() % 20 - 10;//and this will -10 to 9 }

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  • Where can I get VS code snippets?

    - by mafutrct
    Apparently there are many questions that deal with how to store code snippets for Visual Studio, but I did not find one that contains links. So, is there a website that offers useful snippets? My google-fu only brought up many false positives or broken sites.

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  • Use regular expressions to match an ? but not a \?

    - by J.Milly
    I have a PHP regular expression that has been functioning fairly well to parse some odd legacy client templates until recently when we found an escaped question mark (\?) included in a template expression. I'm not strong enough with my regular expression-fu to wrap my feeble noodle around a negative look ahead or some techno-mumbo-jumbo so, tips or points in the right direction would be greatly appreciated. My PHP: preg_match_all("/\{\{IF (.*)\?(.*):(.*)\}\}/U", $template, $m, PREG_SET_ORDER);

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  • Redirect 'myapp.com' to 'www.myapp.com' in rails without using htaccess?

    - by Allan L.
    Using Morph Labs' Appspace to deploy a site means no automated way to redirect 'myapp.com' to 'www.myapp.com' (and no access to .htacess). Is there an in-rails way to do this? Would I need a plugin like subdomain-fu? More specifically, I'm trying to do something like: 'myapp.com' = 'www.myapp.com' 'myapp.com/session/new' = 'www.myapp.com/session/new' Basically, I always want the 'www' subdomain prepended on every request (because the SSL cert specifically has a common name of 'www.myapp.com').

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  • How would I create a random number?

    - by Elliot Bonneville
    How would I create a random number using C++? I've heard that one should use the time as a seed, but I'm not sure how to do that with the correct syntax. How would I do this? One more thing - how would I limit the random number to a particular range? I'm simulating a dice roll and getting numbers in the millions...

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