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• Handling extremely large numbers in a language which can't?

  - by Mallow

  I'm trying to think about how I would go about doing calculations on extremely large numbers (to infinitum - intergers no floats) if the language construct is incapable of handling numbers larger than a certain value. I am sure I am not the first nor the last to ask this question but the search terms I am using aren't giving me an algorithm to handle those situations. Rather most suggestions offer a language change or variable change, or talk about things that seem irrelevant to my search. So I need a little guideance. I would sketch out an algorithm like this: Determine the max length of the integer variable for the language. If a number is more than half the length of the max length of the variable split it in an array. (give a little play room) Array order [0] = the numbers most to the right [n-max] = numbers most to the left Ex. Num: 29392023 Array[0]:23, Array[1]: 20, array[2]: 39, array[3]:29 Since I established half the length of the variable as the mark off point I can then calculate the ones, tenths, hundredths, etc. Place via the halfway mark so that if a variable max length was 10 digits from 0 to 9999999999 then I know that by halfing that to five digits give me some play room. So if I add or multiply I can have a variable checker function that see that the sixth digit (from the right) of array[0] is the same place as the first digit (from the right) of array[1]. Dividing and subtracting have their own issues which I haven't thought about yet. I would like to know about the best implementations of supporting larger numbers than the program can.

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• PATH command not found

  - by joslinm

  Hi, I'm not experienced with PATH (Any good reference would be appreciated), but I made a mistake and did PATH=/google_appengine, which I'm assuming completely overrid PATH. Still, I restarted bash and echo'd PATH and found that the folders were back. mark@mark-laptop:~$ echo $PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games However, when I then tried to append to it, I got an error that PATH wasn't found. I've looked around Google and couldn't find a good answer. Any help would be appreciated mark@mark-laptop:~$ PATH = $PATH:/google_appengine PATH: command not found

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• Intentional misspellings to avoid reserved words

  - by Renesis

  I often see code that include intentional misspellings of common words that for better or worse have become reserved words: klass or clazz for class: Class clazz = ThisClass.class kount for count in SQL: count(*) AS kount Personally I find this decreases readability. In my own practice I haven't found too many cases where a better name couldn't have been used — itemClass or recordTotal. However, it's so common that I can't help but wonder if I'm the only one? Anyone have any advice or even better, quoted recommendations from well-respected programmers on this practice?

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• "Pointers" with $ Syntax in /etc/environment

  - by Tyson Trautmann

  Is it valid to have "pointers" in /etc/environment using $FOO syntax? Right now my /etc/environment looks like this: JAVA_HOME=/usr/lib/jvm/java-6-openjdk MAVEN_HOME=/usr/bin/apache-maven/apache-maven-3.0.4 M2_HOME=$MAVEN_HOME M2=$MAVEN_HOME/bin PATH=/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:$JAVA_HOME/bin:$MAVEN_HOME/bin I'm not getting the results that I'm expecting though: ~$ echo $JAVA_HOME /usr/lib/jvm/java-6-openjdk ~$ echo $MAVEN_HOME /usr/bin/apache-maven/apache-maven-3.0.4 ~$ echo $PATH /usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin/bin:/usr/games:$JAVA_HOME/bin:$MAVEN_HOME/bin

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• ssao implementation

  - by Irbis

  I try to implement a ssao based on this tutorial: link I use a deferred rendering and world coordinates for shading calculations. When saving gbuffer a vertex shader output looks like this: worldPosition = vec3(ModelMatrix * vec4(inPosition, 1.0)); normal = normalize(normalModelMatrix * inNormal); gl_Position = ProjectionMatrix * ViewMatrix * ModelMatrix * vec4(inPosition, 1.0); Next for a ssao calculations I render a scene as a full screen quad and I save an occlusion parameter in a texture. (Vertex positions in the world space: link Normals in the world space: link) SSAO implementation: subroutine (RenderPassType) void ssao() { vec2 texCoord = CalcTexCoord(); vec3 worldPos = texture(texture0, texCoord).xyz; vec3 normal = normalize(texture(texture1, texCoord).xyz); vec2 noiseScale = vec2(screenSize.x / 4, screenSize.y / 4); vec3 rvec = texture(texture2, texCoord * noiseScale).xyz; vec3 tangent = normalize(rvec - normal * dot(rvec, normal)); vec3 bitangent = cross(normal, tangent); mat3 tbn = mat3(tangent, bitangent, normal); float occlusion = 0.0; float radius = 4.0; for (int i = 0; i < kernelSize; ++i) { vec3 pix = tbn * kernel[i]; pix = pix * radius + worldPos; vec4 offset = vec4(pix, 1.0); offset = ProjectionMatrix * ViewMatrix * offset; offset.xy /= offset.w; offset.xy = offset.xy * 0.5 + 0.5; float sample_depth = texture(texture0, offset.xy).z; float range_check = abs(worldPos.z - sample_depth) < radius ? 1.0 : 0.0; occlusion += (sample_depth <= pix.z ? 1.0 : 0.0); } outputColor = vec4(occlusion, occlusion, occlusion, 1); } That code gives following results: camera looking towards -z world space: link camera looking towards +z world space: link I wonder if it is possible to use world coordinates in the above code ? When I move camera I get different results because world space positions don't change. Can I treat worldPos.z as a linear depth ? What should I change to get a correct results ? I except the white areas in place of occlusion, so the ground should has the white areas only near to the object.

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• Setting TeX Live path for root

  - by N.N.

  I have installed TeX Live 2011 vanilla and I have trouble setting the TeX Live path for root (in Ubuntu 11.10). The problem is that when I run sudo tlmgr I get: sudo: tlmgr: command not found To fix the path for non-root it was sufficient to add PATH=/usr/local/texlive/2011/bin/x86_64-linux:$PATH to /etc/profile. I have tried adding this same line to /root/.bashrc and I have also tried to add it to /etc/profile.d/zzz-texlive.sh like Herbert suggest in http://tex.stackexchange.com/questions/26624/tlmgr-inaccessible/26626#26626 but it does not help.

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• Changing $PATH doesn't work?

  - by Ashwini Chaudhary

  I was trying to set PATH in etc/environment file, but after adding the desired path the $PATH is showing an error in terminal: bash: /usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games: No such file or directory Here's the content of environment file: PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/monty/google_appengine" I was trying to add the path to the folder google_appengine to the PATH as mentioned in this Answer, but it doesn't seem to work.

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• Application specific environment variable settings

  - by SuperElectric

  I'm trying to work around a known bug in Ubuntu 9.10, where using the scrollbar in emacs causes text to be highlighted, and the cursor to move. This page here shows that you can fix this by setting an environment variable before launching emacs: $ GDK_NATIVE_WINDOWS=1 emacs So a lazy fix would be to alias "emacs" in my .bashrc: alias emacs="GDK_NATIVE_WINDOWS=1 emacs" This, however, has the drawback of setting this environment variable for all subsequent commands run from that shell. Is there any way to set GDK_NATIVE_WINDOWS=1 for just emacs, whenever I run emacs?

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• add platform to ubuntu

  - by Med

  I am new in ubuntu (come from Win7), i want to know how can i add evironement variable in ubuntu, because the platform where i use exaggerate "To compile and run SCA composites with OW2 FraSCAti, you also have to set the FRASCATI_HOME system environment variable. FRASCATI_HOME has to point to the directory where the OW2 FraSCAti runtime distribution was extracted". And how can i add it to my path "For conveniance, you can add FRASCATI_HOME/bin to your PATH variable to get the frascati command available in the PATH". Please i'am new, could you explaine me what i do step by step..

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• How do you avoid name similarities between your classes and the native ones?

  - by Oscar

  I just ran into an "interesting problem", which I would like your opinion about: I am developing a system and for many reasons (meaning: abstraction, technology independence, etc) we create our own types for exchanging information. For instance: if there is a method which is called SendEmail and is invoked by the business logic, it way have a parameter of type OurCompany.EMailMessage, which is an object which is completely technology independent and contains only "business relevant data" (for instance, no information abut head encoding). Inside the SendEmail function, we get this information from our EMailMEssage object and create a MailMessage (this one is technolgy specific) object so it can be sent over the network. As you can already notice, our class has a very similar name to the "native" language class. The problem is: this is exactly what they are, email messages, so it is hard to find another meaningful name for them. Do you have this problem often? How do you manage it? Edit: @mgkrebbs just commented about using fully qualified names. This is our current approach, but a little bit too verbose, IMHO. I would like something cleaner, if possible.

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• Why ~/.bash_profile is not getting sourced when opening a terminal in Ubuntu 11.04?

  - by Viriato

  Problem I have an Ubuntu 11.04 Virtual Machine and I wanted to set up my Java development environment. I did as follows sudo apt-get install openjdk-6-jdk Added the following entries to ~/.bash_profile export JAVA_HOME=/usr/lib/jvm/java-6-openjdk export PATH=$PATH:$JAVA_HOME/bin Save the changes and exit Open up a terminal again and typed the following echo $JAVA_HOME (blank) echo $PATH (displayed, but not the JAVA_HOME value) Nothing happened, like if the export of JAVA_HOME and it's addition to the PATH were never done. Solution I had to go to ~/.bashrc and add the following entry towards the end of file #Source bash_profile to set JAVA_HOME and add it to the PATH because for some reason is not being picked up . ~/.bash_profile Questions Why did I have to do that? I thought bash_profile, bash_login or profile in absence of those two get executed first before bashrc. Was in this case my terminal a non-login shell? If so, why when doing su after the terminal and putting the password it did not execute profile where I had also set the exports mentioned above?

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• how to read the password from variable?

  - by Viswa

  I am trying to move my file to another system which is located in some other place, with this command: rsync -avrz src destination It works fine. But what I need is to put this command in shell script and run it like: #! /bin/sh rsync -avrz srcfilelocation destination When it runs, it asks for the destination system password. I know that password and give it manually. Now I have decided to assign the password to an environment variable, like pswd="destination system password". I need my shell script to read the password from this variable. How can I write a script to do this?

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• Variable names for Contact Information bits

  - by RustyTheBoyRobot

  I am in the middle of refactoring code and would like to get some ideas on variable naming so that my new names clearly represent the data they hold. I have a class called ContactMethod which makes sense to me; each instance is a different way to contact someone. My problem comes when naming the properties of ContactMethod. For example, one instance might be a Fax number of 555-555-5555 while another could be an Email address of [email protected]; I've got a property called contactMethodType to hold the values "fax" or "email", but I don't know what to call the "555-555-5555" or "[email protected]" part. Has anyone here created a good generic name for this piece of contact information? (PS - the old convention was to call it a "Phone" with fields "phoneType" holding the "fax"/"email" value and "phoneId" holding the number/address. Yuck.)

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• How to persistently export an environment variable before starting compiz

  - by Dykam

  A few months ago compiz suddenly stopped working. That is, it got to a refreshrate where the redrawing is more than noticeable. It took 5 seconds to redraw a chat window. Ever since I've been using metacity instead, but I've found myself missing some plugins badly. I found the following solution: export __GL_YIELD="NOTHING"; compiz --replace This works fine, everything is fast again with compiz. But how to make sure this variable is always set whenever I run compiz? I'm using standard nVidia drivers, failed to get the open source ones working.

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• iOS5: Confusion with loadview and init and instance variables

  - by user743550

  I'm new to iOS5 and storyboarding. I noticed that if I declare an instance variables inside my viewcontroller .h file and set the values inside my init of .m file of my viewcontroller, whe the view of the viewcontroller is displayed, my instance variables show null inside viewDidLoad. In order for me to get myvariables, I'd need to do [self init] inside viewDidLoad. My questions are: @interface tableViewController : UITableViewController { NSMutableArray *myvariable; } @end @implementation tableViewController -(id)init { myvariable = [[NSMutableArray alloc]initWithObjects:@"Hi2",@"Yo2",@"whatsup2", nil]; } - (void)viewDidLoad { NSLog(@"%@",myvariable); // DISPLAYS NULL [super viewDidLoad]; } Why isn't my variables available in viewdidLoad when I declared and implemented in my .h and .m files? If that's the case, is viewDidLoad or viewWillAppear the common places to load the data for the viewcontroller? It looks like even if you instantiate a viewcontroller, the init function gets called but the viewDidLoad doesn't necessarily have the variables to be displayed. Where's the right place/methods to load the model(data) for my viewcontroller? Thanks in advance

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• Passing variables across a multi page form in php

  - by Chris

  Forgive me as I am a newbie. I have a multi page form in which I am using $_SESSIONS to record the variables. <?php session_start(); foreach ( $_POST as $key=>$value ) { if ( $key!="submit" ) { $value= htmlentities(stripslashes(strip_tags($value))); $_SESSION[$key] = $value; } }` I have two problems actually. When I get to a checkform.php that I made that prints out the variables, The variables from page 1 doesn't show up even though that code listed above is on each page. I am using Firefox web developers tool to disable cookies and in the php ini, I altered session.use_trans_sid to 1 to turn it on. For the final page on my checkform.php I print_r($_POST) for the final page which works fine. Why doesn't variables from page 1 not show up? What am I missing? The 2nd problem is that when I print_r($_SESSION), some fields, specifically the checkbox arrays, print as [payment] => Array [agerange] => Array [meals] => Array [mealtypes] => Array What am I missing?

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• [AS3] Calling Php Script with UTF-8 POST variables

  - by kornelijepetak

  AS3 documentation says that Strings in AS3 are in UTF-16 format. There is a textbox on a Flash Clip where user can type some data. When a button is clicked, I want this data to be sent to a php script. I have everything set up, but it seems that the PHP script gets the data in UTF-16 format. The data in the database (which is utf-8) shows some unrecognizable characters (where special characters are used), meaning that the data has not been sent in a correct encoding. var variables:URLVariables=new URLVariables; var varSend:URLRequest=new URLRequest("http://website.com/systematic/accept.php"); varSend.method=URLRequestMethod.POST; varSend.data=variables; var varLoader:URLLoader=new URLLoader; varLoader.dataFormat=URLLoaderDataFormat.VARIABLES; varLoader.addEventListener(Event.COMPLETE, completeHandler); When submit button is clicked, the following handler gets executed. function sendData(event:MouseEvent) : void { // i guess here is the problem (tbName.text is UTF-16) variables.name = tbName.text; varLoader.load(varSend); } Is there any way to send the data so that PHP script gets the data in UTF-8 format? (PHP script is retrieving the value using the $_POST['name']).

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• Accessing Instance Variables from NSTimer selector

  - by Timbo

  Firstly newbie question: What's the difference between a selector and a method? Secondly newbie question (who would have thought): I need to loop some code based on instance variables and pause between loops until some condition (of course based on instance variables) is met. I've looked at sleep, I've looked at NSThread. In both discussions working through those options many asked why don't I use NSTimer, so here I am. Ok so it's simple enough to get a method (selector? ) to fire on a schedule. Problem I have is that I don't know how to see instance variables I've set up outside the timer from within the code NSTimer fires. I need to see those variables from the NSTimer selector code as I 1) will be updating their values and 2) will set labels based on those values. Here's some code that shows the concept… eventually I'd invalidate the timers based on myVariable too, however I've excluded that for code clarity. MyClass *aMyClassInstance = [MyClass new]; [aMyClassInstance setMyVariable:0]; [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(doStuff) userInfo:nil repeats:YES]; [NSTimer scheduledTimerWithTimeInterval:5.0 target:self selector:@selector(doSomeOtherStuff) userInfo:nil repeats:YES]; - (void) doStuff { [aMyClassInstance setMyVariable:11]; // don't actually have access to set aMyClassInstance.myVariable [self updateSomeUILabel:[NSNumber numberWithInt:aMyClassInstance.myVariable]]; // don't actually have access to aMyClassInstance.myVariable } - (void) doSomeOtherStuff { [aMyClassInstance setMyVariable:22]; // don't actually have access to set aMyClassInstance.myVariable [self updateSomeUILabel:[NSNumber numberWithInt:aMyClassInstance.myVariable]]; // don't actually have access to aMyClassInstance.myVariable } - (void) updateSomeUILabel:(NSNumber *)arg{ int value = [arg intValue]; someUILabel.text = [NSString stringWithFormat:@"myVariable = %d", value]; // Updates the UI with new instance variable values }

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• Where is the .NET Framework Global Assembly Cache?

  - by Carlos Loth

  Hi, I installed the VS2010 and .NET 4.0, then I compiled an assembly and ran the gacutil using the exe available on %ProgramFiles%\Microsoft SDKs\Windows\v7.0A\Bin\NETFX 4.0 Tools The output of the executable said the assembly was sucessfully installed on Global Assembly Cache. However, when I go to %WINDIR%\assembly folder I cannot find the assembly I installed using the .NET Framework 4.0 gacutil. I've seen some posts saying the .NET Framework 4.0 has a separated GAC, but what I haven't found was where it is located. May someone to help me to check where can I see the Global Assembly Cache of .NET Framework, as it used to work on previous version (%WINDIR%\assembly)?

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• WCF Global(.asax) Behavior

  - by Theofanis Pantelides

  Hi, I want to create a global option that when a REST call contains &format=json to output the response as a JSON string. If I enter the following String in my method it works: WebOperationContext.Current.OutgoingResponse.Format = WebMessageFormat.Json; However, if I add this line, anywhere in my Global.asax file, I get a nullException for Current Context: String format = ""; if (HttpContext.Current.Request.QueryString["format"] != null) format = HttpContext.Current.Request.QueryString["format"]; if (String.Equals("json", format, StringComparison.OrdinalIgnoreCase)) System.ServiceModel.Web.WebOperationContext.Current.OutgoingResponse.Format = System.ServiceModel.Web.WebMessageFormat.Json; The exception is triggered here: System.ServiceModel.Web.WebOperationContext.Current Anyone know how I can add this functionality globally (WCF)?

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• How to set global hook for WH_CALLWNDPROCRET ?

  - by user261882

  Hello I want to set global hook that tracks which application is active. In my main program I am doing the foloowing : HMODULE mod=::GetModuleHandle(L"HookProcDll"); HHOOK rslt=(WH_CALLWNDPROCRET,MyCallWndRetProc,mod,0); The hook procedure which is called MyCallWndRetProc exists in separate dll called HookProcDll.dll. The hook procedure is watching for WM_ACTIVATE message. The thing is that the code stucks in the line where I am setting the hook, i.e in the line where I am calling ::SetWindowsHookEx. And then Windows gets unresponsive, my task bar disappears and I am left with empty desktop. Then I must reset the computer. What am doing wrong, why Windows get unresponsive ? and Do I need to inject HookProcDll.dll in every process in order to set the global hook, and how can I do that ?

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• Global WH_CBT hook DLL is loaded into some processes only

  - by kriau

  The main program calls the function SetHook in the wi.dll to install global WH_CBT hook. bool WI_API SetHook() { if (!g_hHook) { g_hHook = SetWindowsHookEx(WH_CBT, (HOOKPROC) CBTProc, g_hInstDll, 0); } return g_hHook != NULL; } I presume after installing global hook, wi.dll should be loaded into each process' address space. However wi.dll is loaded in to some processes only. For example, if I start Skype, MS Word I can see that wi.dll is loaded into these processes as well (using Process Explorer), however if I run Firefox, uTorrent, Adobe Reader then wi.dll is not loaded into these processes. I'm using W7 64-bit, main program and wi.dll is 32-bit, all programs mentioned here is 32-bit programs as well. Any ideas why that happens? Thanks in advance.

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• [JavaScript] Global variables across multiple files

  - by Goro

  Hello, A bunch of my JavaScript code is in an external file called helpers.js. Inside the HTML that calls this JavaScript code I find myself in need of knowing if a certain function from helpers.js has been called. I have attempted to create a global variable by defining: var myFunctionTag = true; In global scope both in my HTML code and in helpers.js. Heres what my html code looks like: <html> ... <script type='text/javascript' src='js/helpers.js'></script> ... <script> var myFunctionTag = false; ... //I try to use myFunctionTag here but it is always false, even though it has been se t to 'true' in helpers.js </script> Is what I am trying to do even doable? Thanks,

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• PHP global variable

  - by wamp

  $GLOBALS['current_view'] and global $current_view,which do you prefer and why?

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• Global event handler

  - by plotnick

  How can I define one global GridViewColumnHeader.Click handler for any ListView.GridViewColumnHeader in my project?

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