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  • sql median value of column

    - by Mike
    Is there a way in sql (or tsql) to select the median of a column of numbers? I know you can sort by the column and pick the middle value, but it would be nice if there was a built-in function

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  • C++ Program Always Crashes While doing a std::string assign

    - by bbazso
    I have been trying to debug a crash in my application that crashes (i.e. asserts a * glibc detected free(): invalid pointer: 0x000000000070f0c0 **) while I'm trying to do a simple assign to a string. Note that I'm compiling on a linux system with gcc 4.2.4 with an optimization level set to -O2. With -O0 the application no longer crashes. E.g. std::string abc; abc = "testString"; but if I changed the code as follows it no longer crashes std::string abc("testString"); So again I scratched my head! But the interesting pattern was that the crash moved later on in the application, AGAIN at another string. I found it weird that the application was continuously crashing on a string assign. A typical crash backtrace would look as follows: #0 0x00007f2c2663bfb5 in raise () from /lib64/libc.so.6 (gdb) bt #0 0x00007f2c2663bfb5 in raise () from /lib64/libc.so.6 #1 0x00007f2c2663dbc3 in abort () from /lib64/libc.so.6 #2 0x00000000004d8cb7 in people_streamingserver_sighandler (signum=6) at src/peoplestreamingserver.cpp:487 #3 <signal handler called> #4 0x00007f2c2663bfb5 in raise () from /lib64/libc.so.6 #5 0x00007f2c2663dbc3 in abort () from /lib64/libc.so.6 #6 0x00007f2c26680ce0 in ?? () from /lib64/libc.so.6 #7 0x00007f2c270ca7a0 in std::string::assign (this=0x7f2c21bc8d20, __str=<value optimized out>) at /home/bbazso/ThirdParty/sources/gcc-4.2.4/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/basic_string.h:238 #8 0x00007f2c21bd874a in PEOPLESProtocol::GetStreamName (this=<value optimized out>, pRawPath=0x2342fd8 "rtmp://127.0.0.1/mp4:pop.mp4", lStreamName=@0x7f2c21bc8d20) at /opt/trx-HEAD/gcc/4.2.4/lib/gcc/x86_64-pc-linux-gnu/4.2.4/../../../../include/c++/4.2.4/bits/basic_string.h:491 #9 0x00007f2c21bd9daa in PEOPLESProtocol::SignalProtocolCreated (pProtocol=0x233a4e0, customParameters=@0x7f2c21bc8de0) at peoplestreamer/src/peoplesprotocol.cpp:240 This was really weird behavior and so I started to poke around further in my application to see if there was some sort of memory corruption (either heap or stack) error that could be occurring that could be causing this weird behavior. I even checked for ptr corruptions and came up empty handed. In addition to visual inspection of the code I also tried the following tools: Valgrind using both memcheck and exp-ptrcheck electric fence libsafe I compiled with -fstack-protector-all in gcc I tried MALLOC_CHECK_ set to 2 I ran my code through lint checks as well as cppcheck (to check for mistakes) And I stepped through the code using gdb So I tried a lot of stuff and still came up empty handed. So I was wondering if it could be something like a linker issue or a library issue of some sort that could be causing this problem. Are there any know issues with the std::string that make is susceptible to crashing in -O2 or maybe it has nothing to do with the optimization level? But the only pattern that I can see thus far in my problem is that it always seems to crash on a string and so I was wondering if anyone knew of any issues that my be causing this type of behavior. Thanks a lot!

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  • Adobe Flash or After Effects: How to make a piece of virtual paper blow away?

    - by Allen G
    About a month ago I saw a portfolio website in Flash that featured a stack of cards, and each time you clicked on it, they sort of blew all over the place, thus exposing the backs as videos and pictures. Although I could easily take a bunch of 3D planes and tween them to turn and flip, these cards actually seemed to 'bend'. How is this effect achieved? Sorry I don't have the link to the example. Thanks!

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  • Sorting a text file by date - Date looks like DD/MM/YYYY

    - by John N
    I am trying to sort the dates from the earliest to the latest. I was thinking about using the bufferedreader and do a try searching the first 2 characters of the string and then the 4th and 5th characters and finally the 7th and 8th characters, ignoring the slashes. The following is an example of the text file I have: 04/24/2010 - 2000.0 (Deposit) 09/05/2010 - 20.0 (Fees) 02/30/2007 - 600.0 (Deposit) 06/15/2009 - 200.0 (Fees) 08/23/2010 - 300.0 (Deposit) 06/05/2006 - 500.0 (Fees)

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  • Best way to tackle global hotkey processing in c#?

    - by jeevan
    Hi all I'd like to have multiple global hotkeys in my new app (to control the app from anywhere in windows), and all of the given sources/solutions I found on the web seem to provide with a sort of a limping solution (either solutions only for one g.hotkey, or solutions that while running create annoying mouse delays on the screen). Does anyone here know of a resource that can help me achive this, that I can learn from? Anything? Thanks ! :)

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  • flashsort algorithm

    - by davit-datuashvili
    here is article about FlashSort http://en.wikipedia.org/wiki/Flashsort can anybody help me how to implement i need only steps not code for example i have some numbers (3,8,4,6,9,12,10,11} please help how to sort it by flashsort?

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  • Get copy of files from ClearCase

    - by Pete
    We're just moving from VSS to ClearCase and it's nearly impossible to find out how to do anything :-( I need to script (using ClearTool?) a sort of VSS-GetLatest, i.e copy a folder and all its contents to a windows folder Any clues (in short words please as I'm new to this!)

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  • Settings.bundle Not Appearing on Application Updates

    - by coneybeare
    I have an app that does not currently use a Setting.bundle to display setting in the iPhone Settings app. I am releasing an update that does. On a fresh install, the settings are added to the Setting App as expected, but upon updating from the old install, the bundle is not added. Is there some sort of trick to get the Settings App to show my Settings.bundle?

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  • Windows PE - Where and how are strings stored if not in resources?

    - by sdadsas
    Usually strings (like content/titles of dialog boxes) in .exe files are stored in some sort of resources. But in some recent exes I disassembled/resource-inspected I couldn't find any resources containing the string but it was somehow hardcoded with db's into the program source code. How can I extract and modify strings directly located in the program? I assume those are just the equivalent to const char*s in C++? Why would someone not "outsource" the contents of dialog boxes, menus, etc?

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  • How can I trace a variable at runtime in C#?

    - by luvieere
    How can I track a variable's values as they change, at runtime, in C#? I'm interested in the same functionality that the debugger provides when I'm tracing a variable through execution steps, only that I need to call upon it from my code. Some sort of key-value observing, but for all kinds of variables(local, class, static, etc), not only properties. So, basically, receive a notification when a variable's value changes.

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  • UIScrollView content visible then bounces away

    - by Travis
    I have a pretty simple UIScrollView defined inside Interface Builder. I've pasted in some UILabels and when I run my app, I can drag to see the UILabels at the bottom but as soon as I let go it bounces away from view. What property controls this sort of setting?

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  • Magento customer webservice / api

    - by Nick Dima
    Hi guys, I need some sort of way to handle Magento's customer login, customer account creation and order checkout via some kind of webservice to be used for Flash, preferably XML. As far as I know the Magento API doesn't have these features. I found the Mammoth Webservices extension but it seems that the project is inactive judging from heir site. Any thoughts? Thanks!

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  • MySQL, if a value is in one of two columns, return the value from the other one

    - by erikric
    Hi, This might be an easy one, but I'm not really experienced with sql. I have a table with two user_id columns, user1 and user2. This table contains some compared values between the two users. I want to send in an user id, and return all the id's from the other user when the sent user is either user1 or user2. I guess some sort of if test would do the trick, but I don't know how to do this in SQL. Cheers

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  • How would I merged nested dictionaries in a list in python?

    - by Kevin
    for example if i had the result [{'Germany': {"Luge - Men's Singles": 'Gold'}}, {'Germany': {"Luge - Men's Singles": 'Silver'}}, {'Italy': {"Luge - Men's Singles": 'Bronze'}}] [{'Germany': {"Luge - Women's Singles": 'Gold'}}, {'Austria': {"Luge - Women's Singles": 'Silver'}}, {'Germany': {"Luge - Women's Singles": 'Bronze'}}] [{'Austria': {'Luge - Doubles': 'Gold'}}, {'Latvia': {'Luge - Doubles': 'Silver'}}, {'Germany': {'Luge - Doubles': 'Bronze'}}] how would I sort this so that all of the events germany and so on had won could be under one single title. i.e germany would be germany:Luge - Men's Singles: Gold, Silver, Luge - Women's Singles: Gold, Bronze, Luge - Doubles: Bronze. thanks for any help

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  • UTC time stamp on Windows

    - by Arman
    I have a buffer with the UTC time stamp in C, I broadcast that buffer after every ten seconds. The problem is that the time difference between two packets is not consistent. After 5 to 10 iterations the time difference becomes 9, 11 and then again 10. Kindly help me to sort out this problem. I am using <time.h> for UTC time.

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  • Testing Mobile Sites

    - by Kyle Rozendo
    Hi All, We are about to launch a mobile site and are wondering what the best way of testing across as many mobile browsers as possible would be? This could be a company that does this sort of thing, or a way in which to do it in-house, we're not being picky. Thanks, Kyle

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  • Visual Studio support for coding in MSIL?

    - by jdk
    For the longest time I've been curious to code in Microsoft Intermediate Language (MSIL) just as an academic endeavour and to gain a better understanding of what's "happening under the hood". Is there any sort of Visual Studio support for this in the form of: project templates, IntelliSense integration, and those kind of RAD features?

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  • What are programming lost arts?

    - by pavpanchekha
    Have you ever programmed raw machine code (not for class)? Examined a hex dump with just a hex editor (or, heck, without)? Written your own software floating-point library? Division library? Written a non-school-assignment in Lisp or Forth? What sort of "lost arts" have been forgotten? And what reason (if any) would there be to resurrect them?

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  • Does a wrapper class for a COM interop IStream already exist?

    - by AnthonyWJones
    I'm about to write a Wrapper for a COM interop IStream so that code that expects a standard .NET Stream can use it. However it occurs to me that this sort of thing may already have been done before (although I haven't been able to find it myself with web searching). So I'm just putting this out here in case I'm about to re-invent the wheel. Note I've come across code implementing IStream wrapping a .NET stream but I need the reverse.

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  • BS in CS. Are specializations worth it?

    - by CheesePls
    I'm currently pursuing my BS in Computer Science and my school offers specializations based upon taking certain advanced electives. I was thinking about getting two of them since they are sort of on the way to my degree anyway. They are Software Engineering and Programming Languages and Compilers . Would these specializations actually be useful in finding a job? Would employers even care about them?

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  • Design pattern question: encapsulation or inheritance

    - by Matt
    Hey all, I have a question I have been toiling over for quite a while. I am building a templating engine with two main classes Template.php and Tag.php, with a bunch of extension classes like Img.php and String.php. The program works like this: A Template object creates a Tag objects. Each tag object determines which extension class (img, string, etc.) to implement. The point of the Tag class is to provide helper functions for each extension class such as wrap('div'), addClass('slideshow'), etc. Each Img or String class is used to render code specific to what is required, so $Img->render() would give something like <img src='blah.jpg' /> My Question is: Should I encapsulate all extension functionality within the Tag object like so: Tag.php function __construct($namespace, $args) { // Sort out namespace to determine which extension to call $this->extension = new $namespace($this); // Pass in Tag object so it can be used within extension return $this; // Tag object } function render() { return $this->extension->render(); } Img.php function __construct(Tag $T) { $args = $T->getArgs(); $T->addClass('img'); } function render() { return '<img src="blah.jpg" />'; } Usage: $T = new Tag("img", array(...); $T->render(); .... or should I create more of an inheritance structure because "Img is a Tag" Tag.php public static create($namespace, $args) { // Sort out namespace to determine which extension to call return new $namespace($args); } Img.php class Img extends Tag { function __construct($args) { // Determine namespace then call create tag $T = parent::__construct($namespace, $args); } function render() { return '<img src="blah.jpg" />'; } } Usage: $Img = Tag::create('img', array(...)); $Img->render(); One thing I do need is a common interface for creating custom tags, ie I can instantiate Img(...) then instantiate String(...), I do need to instantiate each extension using Tag. I know this is somewhat vague of a question, I'm hoping some of you have dealt with this in the past and can foresee certain issues with choosing each design pattern. If you have any other suggestions I would love to hear them. Thanks! Matt Mueller

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