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• A JTAG emulator for use with a Hawkboard and OpenOCD?

  - by David Brown

  I'd like to try bare metal ARM programming with the Hawkboard, but the deployment process looks awful. I'm totally new to this, so I could be misunderstanding the instructions, but it appears that I have to use a program called AISgen to convert the binary file, then boot with u-Boot over UART and copy the AIS binary into memory. Not only is that a lot of stuff to do every time I make a change, it also doesn't give me the ability to debug with GDB. The best solution for this that I can find is JTAG. But the prices for these JTAG emulators look ridiculous. I'm not even sure which ones will work with the Hawkboard and which ones won't. So far, my best bet appears to be the Flyswatter, but the pin layout is different. Basically, I need something that's relatively cheap and works with the Hawkboard and OpenOCD. Any suggestions? Or is there another way I could do this, perhaps?

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• Read vector into CUDA shared memory

  - by Ben

  I am new to CUDA and programming GPUs. I need each thread in my block to use a vector of length ndim. So I thought I might do something like this: extern __shared__ float* smem[]; ... if (threadIddx.x == 0) { for (int d=0; d<ndim; ++d) { smem[d] = vector[d]; } } __syncthreads(); ... This works fine. However, I seems wasteful that a single thread should do all loading, so I changed the code to if (threadIdx.x < ndim) { smem[threadIdx.x] = vector[threadIdx.x]; } __syncthreads(); which does not work. Why? It gives different results than the above code even when ndim << blockDim.x.

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• Are there any widespread, modern Java coding conventions?

  - by brianegge

  Sun's "Code Conventions for the Java Programming Language" was last updated April 1999. Ten years later a lot has changed in the language, as well as general usage patterns. Are there more up to date, widely adopted standards? Most guidelines omit specifying file encoding and line endings. Sun recommends mixed tabs and spaces. The Eclipse IDE defaults to Eclipse's standard, which is tabs only. The Maven style guide is spaces only. Many style guides, such as JBoss, follow Sun's guidelines, but prefer K&R braces instead of OTBS. Each Apache project has it's own style guide, with slight differences between each one.

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• Terminate long running thread in thread pool that was created using QueueUserWorkItem(win 32/nt5).

  - by Jake

  I am programming in a win32 nt5 environment. I have a function that is going to be called many times. Each call is atomic. I would like to use QueueUserWorkItem to take advantage of multicore processors. The problem I am having is I only want to give the function 3 seconds to complete. If it has not completed in 3 seconds I want to terminate the thread. Currently I am doing something like this: HANDLE newThreadFuncCall= CreateThread(NULL,0,funcCall,&func_params,0,NULL); DWORD result = WaitForSingleObject(newThreadFuncCall, 3000); if(result == WAIT_TIMEOUT) { TerminateThread(newThreadFuncCall,WAIT_TIMEOUT); } I just spawn a single thread and wait for 3 seconds or it to complete. Is there anyway to do something similar to but using QueueUserWorkItem to queue up the work? Thanks!

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• Is there a logging facade for the .NET world?

  - by Elijah

  I'm somewhat new to the .NET stack and I was wondering if there is an equivalent to slf4j for the .NET platform. For me, logging to a Facade and being able to swap out logging implementations as needed just makes sense. Furthermore, the wrapper APIs available in slf4j have saved me many times when I needed to use a third-party library that was coded against a single logging framework that I wasn't using. Is there a project out there that acts as a facade between loggers like log4net, nLog and Enterprise Library? Are there wrappers that allow me to shortcut calls to those libraries and direct them to another library? Should I start out an open source project to do this myself? Is this question a duplicate because I don't know the right way to ask? Conversely, is the common way to do this using aspect orient programming?

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• How to know what you don't know?

  - by Ivo Danihelka

  Is there a way how to recognize that you don't know something? For example, I had some hard realizations: I didn't know that criticism isn't a good way to teach your friends. I realized that after reading How to Win Friends & Influence People. I didn't know about the fundamental needed for an indutive bias in machine learning. If I have read Mitchell's Machine Learning book early, I would know it. I haven't found it mentioned in other books and papers. Sorry if the question is too generic. The question could also mean: How to know that you are missing something important about your programming language?

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• Using C# and VB.NET in one solution

  - by Younes

  I'm busy on a small project to convert an Access2003 db to .NET. I am trying to integrate my functionality in an excisting project that is being used for Administration of some kind. The code in this project is vb.net. I started by setting up my Data Access Layer, which seems to work fine. I can make new web pages that acces the data I need. However when i start to use class files to set up my Business Logic Layer i can't build my project when using C# instead of VB. I Dislike VB and like to program in C# as i know the syntax alot better etc. Is it possible to program using C# knowing that VB.NET was the language chosen to buold the entire project on? If not, what will be the smartest way to integrate my module into the project using my favorite programming language? (Make a project and reference to the dll?)

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• gluLookAt doesn't work

  - by Tyzak

  hi, i'm programming with opengl and i want to change the camera view: ... void RenderScene() //Zeichenfunktion { glClearColor( 1.0, 0.5, 0.0, 0 ); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glLoadIdentity (); //1.Form: glBegin( GL_POLYGON ); //polygone glColor3f( 1.0f, 0.0f, 0.0f ); //rot glVertex3f( -0.5, -0.5, -0.5 ); //unten links 3 =3 koords, f=float glColor3f( 0.0f, 0.0f, 1.0f ); //blau glVertex3f( 0.5, -0.5, -0.5 ); //unten rechts glVertex3f( 0.5, 0.5, -0.5 );//oben rechts glVertex3f( -0.5, 0.5, -0.5 );//oben links glEnd(); Wuerfel(0.7); //creates cube with length 0.7 gluLookAt ( 0., 0.3, 1.0, 0., 0.7, 0., 0., 1., 0.); glFlush(); //Buffer leeren } ... when i change the parameter of gluLookAt, nothing happens, what do i wrong? thanks

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• Step-by-step execution for Intel AT&T assembler?

  - by Søren Haagerup

  Hello everyone, I'm writing a compiler that converts source code (written in a small imperative programming language) to Intel AT&T 32-bit assembler. I tend to spend a lot of time debugging, because of nasty offset-mistakes etc. in the generated code, and I would like to know if anyone knows of a tool to "walk through" the generated assembler code step-by-step, visualizing what's on the stack etc. I use Ubuntu Linux as my development platform, and I'm comfortable with the terminal -- a GUI-program would be nice though. Does it exist? Or is there a good reason it doesn't (maybe the problem isn't so straightforward..?) If you have good ideas for approaching debugging tasks in assembly code, I'll be glad to hear from you!

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• Naive Bayesian for Topic detection using "Bag of Words" approach

  - by AlgoMan

  I am trying to implement a naive bayseian approach to find the topic of a given document or stream of words. Is there are Naive Bayesian approach that i might be able to look up for this ? Also, i am trying to improve my dictionary as i go along. Initially, i have a bunch of words that map to a topics (hard-coded). Depending on the occurrence of the words other than the ones that are already mapped. And depending on the occurrences of these words i want to add them to the mappings, hence improving and learning about new words that map to topic. And also changing the probabilities of words. How should i go about doing this ? Is my approach the right one ? Which programming language would be best suited for the implementation ?

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• Control.EndInvoke resets call stack for exception

  - by Brian Rasmussen

  I don't do a lot of Windows GUI programming, so this may all be common knowledge to people more familiar with WinForms than I am. Unfortunately I have not been able to find any resources to explain the issue, I encountered today during debugging. If we call EndInvoke on an async delegate. We will get any exception thrown during execution of the method re-thrown. The call stack will reflect the original source of the exception. However, if we do something similar on a Windows.Forms.Control, the implementation of Control.EndInvoke resets the call stack. This can be observed by a simple test or by looking at the code in Reflector. The relevant code excerpt from EndInvoke is here: if (entry.exception != null) { throw entry.exception; } I understand that Begin/EndInvoke on Control and async delegates are different, but I would have expected similar behavior on Control.EndInvoke. Is there any reason Control doesn't do whatever it is async delegates do to preserve the original call stack?

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• qt/wxwidgets third party components?

  - by tkd

  I'm used to working in a Delphi and C# environment which seem to have a rich set of third party components available. I'm currently wanting to do cross-platform programming in C++ using either qt or wxwidgets. Is there a large market for third party components? I was looking at sourceforge and that doesn't seem to show much that is useful (how the hell do you find out what components or features are in a project without downloading the source?). I'm thinking carousel/coverflow components, rich datagrids (like the sort DevExpress provide). Or is this, write your own territory?

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• PHP New Line Help

  - by Jeremy Person

  I'm just starting PHP programming as you can tell. I want the results of each statement to be on their own line but can't get it to work yet. I tried referring to the code on this page and am obvsiously doing something wrong. Thank you very much. <? $mySentence="This is a sentence 123456789."; $myNumber1 = 9.5; $myNumber2 = .5; $sum = $myNumber1 + $myNumber2; echo "Hello, lets display our PHP variables: \r"; echo $mySentence; echo "The sum of $myNumber 1 and $myNumber2 = $sum "; echo "\"This text has double quotes\""; ?>

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• Issue Passing NSMutableDictionary to Method

  - by roswell

  Hello all, I'm trying some basic iPhone programming -- all has been going well but recently I've hit a bit of a roadblock. I've got a chunk of code that's passing an NSMutableDictionary (amongst other things) to a method in another class: [self.shuttle makeAPICallAndReturnResultsUsingMode:@"login" module:@"login" query:credentials]; The NSMutableArray credentials is previously defined a bit above as such: NSMutableDictionary *credentials = [[NSMutableDictionary alloc] init]; [credentials setObject:username forKey:@"username"]; [credentials setObject:password forKey:@"password"]; The method that receives it looks like such: -(id)makeAPICallAndReturnResultsUsingMode:(NSString *)mode module:(NSString *)module query:(NSMutableDictionary *)query From debugging I have determined that the code works fine up until this point within the above method: [query setObject:self.sessionID forKey:@"session_id"]; At this point, the application terminates -- the Console informs me of this exception: * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[NSCFDictionary setObject:forKey:]: method sent to an uninitialized mutable dictionary object' This leads me to believe that I must initialize NSMutableDictionary in some way in my new method before I can access it, but I have no idea how. Any advice?

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• Offtopic : how can I see my deleted question? Why it was deleted, but not closed?

  - by Tom

  I know it is offtopic and I will delete my question as soon as I get any answer, but somebody deleted my question. The question was opened for the whole day, but when I got 3 reopens and edited my question for asking for 2 more reopens to reopen my question, somebody deleted my question. It was about efficiency during the programming. Why somebody deleted my question and didn't let to be it closed? I found there many good answers although it was closed and now I can see absolutely nothing so I suppose it was deleted. Can somebody tell me smth?

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• TimeZoneInfo - why can't i seem to create an instance of it?

  - by Kravlin

  I'm trying to use the EWS API to access an Exchange server from a console program i'm writing. I've specified the type of exchange server i'm connecting to but when I try to execute the code i have, it gives me Error 1 The type 'System.TimeZoneInfo' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. C:\Documents and Settings\jsorensen\My Documents\Visual Studio 2005\Projects\ConsoleApplication2\ConsoleApplication2\Program.cs 26 13 ConsoleApplication2 Does Microsoft Visual Studio Academic Edition not support TimeZoneInfo or is the version of .Net that XP can have not up-to date enough to work with the EWS API? I'm moderately new to programming in C# so some of the stuff is still confusing. Thanks.

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• Reducing piracy of iPhone applications

  - by Alex Reynolds

  What are accepted methods to reduce iPhone application piracy, which do not violate Apple's evaluation process? If my application "phones home" to provide the unique device ID on which it runs, what other information would I need to collect (e.g., the Apple ID used to purchase the application) to create a valid registration token that authorizes use of the application? Likewise, what code would I use to access that extra data? What seem to be the best available technical approaches to this problem, at the present time? (Please refrain from non-programming answers about how piracy is inevitable, etc.)

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• Something is wrong with this C code to reverse string, but I dont know what ? please help

  - by Harbhag

  Hi all, I am beginnner to programming. I wrote this little program to reverse a string. But if I try to reverse a string which is less than 5 characters long then it gives wrong output. I cant seem to find whats wrong. #include<stdio.h> #include<string.h> int main() { char test[50]; char rtest[50]; int i, j=0; printf("Enter string : "); scanf("%s", test); int max = strlen(test) - 1; for ( i = max; i>=0; i--) { rtest[j] = test[i]; j++; } printf("Reversal is : %s\n", rtest); return 0; }

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• ruby syntactic sugar: dealing with nils..

  - by luca

  probably asked already but I couldn't find it.. here are 2 common situation (for me while programming rails..) that are frustrating to write in ruby: "a string".match(/abc(.+)abc/)[1] in this case I get an error because the string doesn't match, therefore the [] operator is called upon nil. What I'd like to find is a nicer alternative to the following: temp="a string".match(/abc(.+)abc/); temp.nil? ? nil : temp[1] in brief, if it didn't match simply return nil without the error The second situation is this one: var = something.very.long.and.tedious.to.write var = something.other if var.nil? In this case I want to assign something to var only if it's not nil, in case it's nil I'll assign something.other.. Any suggestion? Thanks!

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• how to better use of eclipse code templates (PHP)?

  - by pocketfullofcheese

  One particular problem I was having was using ${word_selection} in an Eclipse PDT template. I was recently trying to use some code templates with Eclipse PDT 2.1 to speed up some common tasks. We use a lot of getters/setters, so I wrote the following template. function get${word_selection}() { return $$this->getData('${word_selection}'); } function set${word_selection}($$${word_selection}) { $$this->setData('${word_selection}', $$${word_selection}); } I named the template "getset" and the only way I know to use the Code Assist is to type: "getset" then hit my code assist keys (I have it set to Esc, but I think the default was Ctrl+Space). The problem is, this doesn't actually let me select a word to be used by the ${word_selection}. how do I type in my template name, hit the key combo, and have a word selected all at the same time? I also want to know what kinds of templates people have set up and any other tips for using templates to speed of programming.

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• Substring and its reverse in a string

  - by christa

  My professor was talking about this in a Dynamic programming class and asked us to think over it. She gave us some examples as well. Given a string, we were to find the longest continuous subsequence whose reverse is also a subsequence present in the given string. Example: INPUT: pqrstuvtsrv OUTPUT: i=3, k=2 rst -> tsr (rst found first at i=3 and for 2 more positions) INPUT: mpqrsrqp OUTPUT: i=2, k=6 pqrsrqp in reverse INPUT: mmpqssss OUTPUT: i=5, k=3 I thought of putting the string and its reverse into 2 different arrays and comparing character by character. But I'm sure this is not the best way to do it. Any suggestions as to what could be the most efficient ?

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• Advanced Java book in the lines of CLR via c# or C# in Depth?

  - by devoured elysium

  I want to learn about how things work in depth in Java. Coming from a c# background, there were a couple of very good books that go really deep in c# (C# in depth, CLR via c#, just to name the most popular). Is there anything like that in Java? I searched it up on amazon but nothing seemed to go that deep in Java as the two above go in c#. I don't want to know more about specific classes, or how to use this library or that other library, I want to learn how the objects are created on memory, how they get created on the stack, heap, etc. A more fundamental knowledge, let's say. I've read some chapters of Effective Java and The Java Programming Language but they don't seem to go so deep as I'd want them to go. Maybe there are other people that know both c# and Java that have read any of the referred books and know any that might be useful? Thanks

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• Good .NET based CMS?

  - by rAm

  For many projects we had to choose a CMS platform. I came across a few CMS platforms based on .NET. I want to know your experience. Community Server (cannot be called a true CMS) DotNetNuke (DNN) Umbraco Kentico Sitefinity Can you please touch upon the following points: UI customization. Feature extension. Third party extensions Support And most important: how much time it takes to learn, as a programmer and someone who manages the application with little or no programming knowledge. Update: thanks for all the responses, I have seen the other thread but did not get a satisfactory reply addressing the Support and Time? (which I forgot to add earlier).

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• What is your best programmer joke?

  - by hmason

  When I teach introductory computer science courses, I like to lighten the mood with some humor. Having a sense of fun about the material makes it less frustrating and more memorable, and it's even motivating if the joke requires some technical understanding to 'get it'! I'll start off with a couple of my favorites: Q: How do you tell an introverted computer scientist from an extroverted computer scientist? A: An extroverted computer scientist looks at your shoes when he talks to you. And the classic: Q: Why do programmers always mix up Halloween and Christmas? A: Because Oct 31 == Dec 25! I'm always looking for more of these, and I can't think of a better group of people to ask. What are your best programmer/computer science/programming jokes?

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• Regular expression in BASH

  - by Ryan

  Hello everyone, I was hoping someone could answer my quick question as I am going nuts! I have recently started learning regular expressions in my Java programming however am a little confused how to get certain features to work correctly directly in BASH. For example, the following code is not working as I think it should. echo 2222 | grep '2\{2\}' I am expecting it to return: 22 I have tried variations of it including: echo 2222 | grep '2{2}' echo 2222 | grep -P '2\{2\}' echo 2222 | grep -E '2\{2\}' However I am completely out of ideas. I'm sure this is a simple parameter / syntax fix and would love some help! P.S I've done tons of googling and every reference I find does not work in BASH; regex's can run on so many different platforms and engines =/

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