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• Java API Method Run Times

  - by Mike

  Is there a good resource to get run times for standard API functions? It's somewhat confusing when trying to optimize your program. I know Java isn't made to be particularly speedy but I can't seem to find much info on this at all. Example Problem: If I am looking for a certain token in a file is it faster to scan each line using string.contains(...) or to bring in say 100 or so lines putting them to a local string them performing contains on that chunk.

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• jQuery: what if I don't have mouseleave function ?

  - by Patrick

  hi, I'm using Drupal for a website and I can only use jQuery 1.2.7 (not the most recent versions). I want to fade in / fade out a div element and I'm using mouseover / mouseout functions. However, this element contains some children and when I move the mouse over it, the mouseout function is triggered, because I'm moving over one of its children. Since I don't have mouseleave function, how can I solve this issue ? thanks

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• Have a range of IE builds on test machine

  - by Dan

  I currently have a testing environment for web apps on a virtual machine. The problem - i would like to keep IE 6 for testing and also have access to newer versions of IE as well. How can i do this? Thanks.

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• matlab: subs on symbolic constant returns scalar instead of vector for a vector input

  - by noam

  usually, symbolic functions return vectors for vector inputs: syms('x'); f=x*2; subs(f,[1 2 3]) outputs: [2 4 6] but doing f=sym('0'); subs(f,[1 2 3]); outputs: 0 and not: [0 0 0] so basically, my questions is how do I make f behave as a "normal" symbolic function. I can do something ugly like f=x-x to create a function that always returns zero, but is there a prettier way?

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• FORTRAN: determine variable type

  - by tibbs

  hello, GOOGLE has yet to find an answer for me, so here goes: In FORTRAN, is there a way to determine the TYPE of a variable? E.G., pass the variable type as an argument in a function, to then be able to call type-specific code with that fuction; eliminating the need to have seperate similar functions for each data type. thanks.

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• Are there any (somewhat) advanced mathematics Javascript libraries?

  - by pr1001

  Are there any libraries knocking around that provide any additional general purpose math functions for Javascript? Say things like sums over a range, derivatives, integrals, etc. I can imagine that many things aren't possible, so even libraries that do rough approximations would be interesting. Thanks!

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• How to check if a socket is connected/disconnected in C#?

  - by lesderid

  I'm writing an emulator for a game and one of the functions is "SendToAll". How can I check which sockets are still connected? (The client doesn't send a Logout/Disconnect packet.)

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• Struct inside a class

  - by Balakrishnan

  I have a class definition of the form class X { public: //class functions private: A_type *A; //other class variables }; and struct A_type is defined as struct A_type { string s1,s2,s3; }; Inside the constructor, I allocate appropriate memory for A and try A[0].s1="somestring"; It shows segmentation fault. Is this kind of declaration invalid, or am I missing something

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• This is a valid C code but not a valid C++ code?

  - by claws

  In some library I'm using (written in C) its StorePGM(image, width, height, filename) char *image; int width, height; char *filename; { // something something } All functions are defined this way. I never seen such function definitions in my life. They seem to be valid to MSVC but when I compile it as C++ it gives errors. What is it? some kind of old version C?

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• Blittable Vs. Non-Blittable in IL

  - by Michael Covelli

  I'm trying to make sure that my Managed to Unmanaged calls are optimized. Is there a quick way to see by looking at the IL if any non-blittable types have accidentally gotten into my pinvoke calls? I tried just writing two unmanaged functions in a .dll, one that uses bool (which is non-blittable) and one that uses ints. But I didn't see anything different when looking at the IL to let me know that it was doing something extra to marshal the bool.

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• How can I make python be more friendly regarding reading and writing Unicode text files?

  - by bogdan

  I found that even modern Python versions (like 3.x) are not able to detect BOM on text files. I would like to know if there is any module that could add this missing feature to Python by replacing the open() and codecs.open() functions for reading and writing text files.

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• Grails - how to save a domain object inside a Service ?

  - by w-

  I have a service and inside one of the functions i'm creating a domain object and trying to save it. when it gets to the save part, i get the error No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here What do i need to do in order to save a domain object inside of a service. everything on the internet makes it look like this should just work....

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• Determine if a number is a prime with regex?

  - by kitlite

  I found the following code example for Java on RosettaCode: public static boolean prime(int n) { return !new String(new char[n]).matches(".?|(..+?)\\1+"); } I don't know Java in particular but understand all aspects of this snippet except for the regex itself I have basic to basic-advanced knowledge of Regex as you find it in the built-in PHP functions How does .?|(..+?)\\1+ match prime numbers?

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• Algorithms after load-balancer?

  - by Vimvq1987

  I need to study about load-balancers, such as Network Load Balancing, Linux Virtual Server, HAProxy,...There're somethings under-the-hood I need to know: What algorithms/technologies are used in these load-balancers? Which is the most popular? most effective? I expect that these algorithms/technologies will not be too complicated. Are there some resources written about them? Thank you very much for your help.

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• Why does string::find return size_type and not an iterator?

  - by dehmann

  In C++, why does string::find return size_type and not an iterator? It would make sense because functions like string::replace or string::insert take iterators as input, so you could find some character and immediately pass the returned iterator to replace, etc. Also, std::find returns an iterator -- why is std::string::find different?

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• Using recursion to sum two numbers (python)

  - by James

  I need to write a recursive function that can add two numbers (x, y), assuming y is not negative. I need to do it using two functions which return x-1 and x+1, and I can't use + or - anywhere in the code. I have no idea how to start, any hints?

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• folder deleting not working

  - by user1150440

  If System.IO.Directory.Exists(HttpContext.Current.Server.MapPath(Server.MapPath("images/TravelogueGallery/" & getMaxID()))) Then System.IO.Directory.Delete(HttpContext.Current.Server.MapPath("images/TravelogueGallery/" & getMaxID()), True) End If I am using the above code snippet to delete a directory but i get this error "'G:\Projects\Latest\LTCIndia 05-04-12 1415\images\TravelogueGallery\19' is not a valid virtual path. " Whats wrong with the code?

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• Should the function or the caller be resonsible for input validation?

  - by haudenschilt

  I'm doing a security audit on a fairly large php application and was wondering where I should include my user-input validation. Should I validate the data, then send the clean data off to the back-end functions or should I rely on each function to do it's own validation? Or even both? Is there any standard or best-practice for this sort of thing? Currently the app does both inconsistently and I'll like to make things more consistent.

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• Does the respondsToSelector method have to exist?

  - by John Smith

  Does a method which I check for with respondsToSelector have to actually exist? What if I only define it in the interface part and fail to implement it? I'm looking at a poor-man's virtual function in Objective-C.

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• Android hdpi resource load problem

  - by user357366

  good day we are developing game for android and have some trouble with resource loading on high dpi devices. our resources are located in res/drawable directory on a standart dpi device the game work properly, but on hdpi (tested on HTC Desire) all resources which located in res/drawable-hdpi load are loaded correctly, but the resources which miss in drawable-hdpi directory but present in res/drawable are ignored but everything works fine on the virtual device with hdpi. does anybody encounter this problem and know how to solve it?

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• reference external javascript in mvc not working

  - by user281180

  Hi I have created an extrenal javascript and inserted the path in my site.master with other scripts. However, I can`t access the functions of the file. What can be the problem? Have I done it right, though I wanted to access it directly from my view?

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• Is there a equivalent in C for C++ templates?

  - by nunos

  In the code I am writing I need a foo(int, char*) and a foo(int, int) functions. If I was coding this in C++ I would use templates. Is there any equivalent for C? Or should I use void pointers? How? Thanks.

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• Determine if current user is in Administrators group (Windows/Python)

  - by FogleBird

  I want certain functions in my application to only be accessible if the current user is an administrator. How can I determine if the current user is in the local Administrators group using Python on Windows?

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• What does the GDI+ background thread do?

  - by uj

  Upon initialization, GDI+ (non .NET) creates a background thread, which can optionally be suppressed subject to calling some hook functions. MSDN, however, doesn't say what this thread actually does. Google doesn't seem to know either. What is it for?

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• Why subtract a value from itself (x - x) in Python?

  - by endolith

  In NumPy functions, there are often initial lines that do checking of variable types, forcing them to be certain types, etc. Can someone explain the point of these lines? What does subtracting a value from itself do? t,w = asarray(t), asarray(duty) w = asarray(w + (t-t)) t = asarray(t + (w-w))

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