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• Need help understanding several MATLAB statement

  - by user198729

  All are from this post. What does these statement mean: error(nargchk(5, 6, nargin)); plot(p(:,1), p(:,2), '.-'), axis equal And what's this kinda syntax which I haven't quite often seen: if nargin<6, steps = 36; end

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• Subclassing Cocoa means no subclass ivars in some cases?

  - by Michael

  The question is generally coming from self = [super init]. In case if I'm subclassing NSSomething and in my init's method self = [super init] returns object of different class, does it mean I am not able to have my very own ivars in my subclass, just because self will be pointing to different class? Appreciate if you could bring some examples if my statement is wrong.

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• Why are interfaces unusable in PHP?

  - by streetparade

  I mean an interface definition without defining the return type makes it unusable? This makes more Clear Interface run { public function getInteger(); } class MyString implements run { public function myNumber() { } public function getInteger() { return "Not a number"; } } In Java every Interface has a return type like Integer,String,Void I know that PHP is unfortunately a loosly typed Language but isnt there a Solution for that Problem? Is it Possible to defining a Interface with a Return type like Integer?

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• autoreferencing this class to use in another for c++

  - by atomsfat

  in java we can do this: public class A{ public static void main(String...str){ B b = new B(); b.doSomething(this); //How I do this in c++ ? the this self reference } } public class B{ public void doSomething(A a){ //Importat stuff happen here } } How can I do the same but in c++, I mean the self reference of A to use the method in B ?

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• Question about Null vs zero

  - by Mike

  I have this function: void ToUpper(char * S) { while (*S!=0) { *S=(*S >= 'a' && *S <= 'z')?(*S-'a'+'A'):*S; S++; } } What does it mean for *S != 0, should it be null instead?

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• Visual Studio & RAD support for coding directly in IL?

  - by jdk

  For the longest time I've been curious to code in Intermediate Language just as an academic endeavour and to gain a better understanding of what's "happening under the hood". Does anybody provide Visual Studio support for *IL in the form of: project templates, IntelliSense integration, and those kind of RAD features? Edits: I don't mean restricted to out of the box support. For example, I can download Visual Studio extensions to support Python, COBOL, etc. Want the same for *IL. There is a stand-alone Intermediate Assembler tool.

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• this parameter modifier in C#?

  - by Ivan

  I'm curious about this code snippet: public static class XNAExtensions { /// <summary> /// Write a Point /// </summary> public static void Write(this NetOutgoingMessage message, Point value) { message.Write(value.X); message.Write(value.Y); } // ... }; What does the this keyword mean next to the parameter type? I can't seem to find any information about it anywhere, even in the C# specification.

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• Where c++ really shines?

  - by pygabriel

  I know C and python, and I'm moving toward another language for learning purposes. My problem is that I like to learn things with something to do (for example contributing to some project or do something amazing, not boring plain algebra). I would like to hear suggestions about the fields in which C++ shines and where I can found interesting programming with C++. (for fields I mean networking/gui programming/algorithms/games ...)

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• Blackberry persistance: ObjectGroup createGroup vs. createGroupIgnoreTooBig

  - by Tamar

  What is the difference between the createGroup and createGroupIgnoreTooBig? I understand that createGroup will throw the too big exception when the object exceeds 64k, and createGroupIgnoreTooBig will not. But does it mean that createGroupIgnoreTooBig allows me to create objects larger than 64k, or will it only partially group it?

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• How do you allow the user to add items to a tableview in iPhone SDK?

  - by Jack

  Hi, I'm kind of new to this stuff. I was wondering how you can allow the user of your iPhone app to add new items to your tableview. If you're confused by what I mean, please look at the free app, ListGnome.

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• does memcpy params have to be of the same type ?

  - by numerical25

  I was reading that memcpy takes the number of bytes from a source location and adds it to a destination location. Does this mean that memcpy could possibly change datatype entirely ?? memcpy(DoubleOne, CharTwo, strlen(CharTwo)); considering that both values are empty still.

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• question about char array

  - by davit-datuashvili

  i have question about char array how declare in java array of char from a to z ? i mean char characters []=new char[]{a....z]? thank

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• how use in it in main project?

  - by davit-datuashvili

  I have the following interface: public interface MyFunctor { int myFunction(int x); } And I created a class which implements this interface : public class Myfunction1 implements MyFunctor { } how use in main project? i have corrected mistake now i need how run it in main project? i mean in public static void main(String[]args)?

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• Interrupt mechanism in C,C++

  - by mawia

  Hey I was writing a udp client server in which a client waits for packets from server.But I want to limit this wait for certain time.After client don't get response for a certain moment in raise an alarm,basically it comes out and start taking remedy steps.So what are the possible solution for it.I think writing a wrapper around recv will work but how exactly this has to be done,I mean how will make recv raise alarm for you after that time limit. Any Help in this regard will be appreciated. Thanks!

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• Is there something better / faster / cooler than Open GL?

  - by mystify

  Do the really really really really really really really big games (I mean the REALLY big ones, that cost billions to develop) also use Open GL? Or are there some proprietary technologies out there, which can scare Open GL's pants off?

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• What kind of data type is this?

  - by mystify

  In an class header I have seen something like this: enum { kAudioSessionProperty_PreferredHardwareSampleRate = 'hwsr', // Float64 kAudioSessionProperty_PreferredHardwareIOBufferDuration = 'iobd' // Float32 }; Now I wonder what data type such an kAudioSessionProperty_PreferredHardwareSampleRate actually is? I mean this looks like plain old C, but in Objective-C I would write @"hwsr" if I wanted to make it a string. I want to pass such an "constant" or "enum thing" as argument to an method.

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• PHP: What does __('Some text') do?

  - by Svish

  Reading about Kohana templates and saw soemthing I've never seen before: $this->template->title = __('Welcome To Acme Widgets'); What does __('Text') mean? What is it? What does it do?

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• Is C really a subset of C++?

  - by Allopen

  What I mean is, can any C code be implemented via C++? Maybe just simply change a compiler? I know C is much more efficient and concise. But despite of these, can C++ used to implement all functions that are implemented by C?

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• what exactly is delegate in C#

  - by Learning.net

  Hi All, can somebody explain the use of delegate..I know that it is used to invoke methods at run time...but exactly what does it mean..can somebody explain it with some simple example, which will help a newcomer to understand delegate better

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• Controlling form elements from a different thread in Windows Mobile

  - by d1k_is

  Trying to get a thread to change form controls in Windows Mobile. Throws an unsupported exception. Does this mean it cant be done at all? If not, how do I go about this? Forms are created in the Parent/Main thread then a thread is created to do some work in the background but I want to make it so the Background thread can update the form to show its completed...

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• Is the next C standard actively developed?

  - by wwwww

  Is there currently a group working on the next C standard (by next, I mean after C99)? If so, what are the features likely to make it in?

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• from string to integer (scripts)

  - by lego69

  I have this snippet of the code: set calls = `cut -d" " -f2 ${2} | grep -c "$numbers"` set messages = `cut -d" " -f2 ${3} | grep -c "$numbers"` @ popularity = (calls * 3) + messages and error @ expression syntax what does it mean? grep -c returns number, am I wrong, thanks in advance in $numbers I have list of numbers, 2 and 3 parameters also contain numbers

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• Increment and Decrement operators

  - by viswanathan

  How are the below valid and invalid as shown and what do they mean. When would such a situation arise to write this piece of code. ++x = 5; // legal --x = 5; // legal x++ = 5; // illegal x-- = 5; // illegal

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• What is the rationale for difference between -> and . in c++ ?

  - by Good Person

  I know the difference between the member operator (.) and the member by pointer operator (-). Why did the c++ designers create a different operator for this access? Why can't the compiler figure it out on its own? If you always used a . does any case exist where it is ambiguous whether you mean a member or a member by pointer?

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• Rails: it's a good ideia to store the view in a global var?

  - by Totty

  Im thinking of storing the view, what i mean by view is like this: app/views/profiles/index.html.haml into this i would do $view = self then in other parts of my app i would use and edit the $view var. it might get troubles?

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