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• Plotting Bessel function in MatLab

  - by 4alala

  In MatLab how do you plot f(r) = { 2*J1(a*r) / r }^2 where a = 2*pi and J1 is Bessel function of the 1st kind and r = sqrt(x^2 + y^2) This should plot in 3D, i.e. kind of be like a bubble (not sure how to do this)

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• How to find Unix system() function path in C

  - by charly

  i am doing a project about shell, and i want the code that gives me the path the system() function uses. example, when i enter the command type dir the reply will be dir is external command (/bin/dir)

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• Function allocation

  - by novice_coder

  Where are functions stored in a C++ program? For example int abc() { //where am I stored? } I know that we can take the address of a function, that means functions are stored somewhere in memory. But I have already read at many places that no memory allocation for functions takes place. I am confused. My question may seem vague to many of you but I can't help.

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• How can I return a variable from a $.getJSON function

  - by Sean Chambers

  I want to return StudentId to use elsewhere outside of the scope of the $.getJSON() j.getJSON(url, data, function(result) { var studentId = result.Something; }); //use studentId here I would imagine this has to do with scoping, but it doesn't seem to work the same way c# does

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• Figure out function argument from custom struct?

  - by Moshe

  I have a function which takes a custom struct as the argument. how can I figure out what the argument should be? I know it is a date format of sorts... (C library imported to Objective-C...)

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• Function names extraction from static library.

  - by Max

  Hi! I have a static library static_library.a How to list functions and methods realized there. or at least how to look is there concrete function 'FUNCTION_NAME' realized?

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• Attaching Memeber function of a class in pthread

  - by Sandeep

  pthread_t thread1; pthread_create(&thread1,NULL,.......,NULL);// Here I want to attach a thread to a member funtion of class How can i pass the Member function of a class in the above code.

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• str_replace function wont replace string if i use single quotes

  - by robezy

  I using php's str_replace function to replace some text. Example below. str_replace("{x+{\$v}}", "{x-{\$v}}", $this->introtext); str_replace('{x+{\$v}}', '{x-{\$v}}', $this->introtext); In first case it replace text, but in second case it is not doing so. What is difference between two?

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• How to pass a resource file string to a function in an external .js file

  - by hima

  Hi , There is a Messages.resx file under App_GlobalResources in my solution. Everytime i create a string and give a value to the string internal static string Alert_EnterUserName { get { return ResourceManager.GetString("Alert_EnterUserName", resourceCulture); } } is created automatically. Can anybody guide me how to use this string in a function which is present in a seperate .js file? Thanks in advance

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• power function in blackberry

  - by Rahul Varma

  Hi, I desperately need a solution for this... I m using Blackberry JDE 5.0. In documentation it shows net.rim.device.api.util.MathUtilities.pow ( double double ) is added form 4.6. But i couldnt get pow function when i use Math.pow(). I need to get this value...float fSecondFactor=(float) (Math.pow(1+fRatePerMonth,fNumberofMonths)-1); Can anyone tell me how to achieve this...Plzz....

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• Warning: control reaches end of non-valid function - iPhone

  - by Dave

  I keep getting 'warning: control reaches end of non-void function' with this code: - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { if (section ==0) { return [comparativeList count]; } if (section==1) { return [generalList count]; } if (section==2) { return [contactList count]; How can I get rid of this warning? Thanks.

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• Checkbox Styling with SelectAll Function

  - by Wilson

  Was styling the checkboxes of my webpage with jquery using the tutorial here But i realized that I could not do SelectAll checkbox that will select all the checkboxes in my list. It works in the backend (the checkboxes are selected) but it does not show in my page. Added a demo to show my problem. May need to port to your system to test it out Demo what can I add to the jQuery Custom Radio-buttons and Checkbox javascript file in the to achieve the select all checkbox function Thank you!

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• What's behind the 'system' function in perl?

  - by JohnJohnGa

  i can thought that it will open a shell, execute the parameter (shell command) and return the result in a scalar. But, execute 'system' function in a perl script is faster than a shell command. It will call this command in C? If yes, what's the difference between rmdir foo and system('rmdir foo'); Thanks,

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• SQL Timstamp Function

  - by harrison

  Is there any difference between these two queries? select * from tbl where ts < '9999-12-31-24.00.00.000000'; and select * from tbl where ts < timestamp('9999-12-31-24.00.00.000000'); When is the timestamp function required? Is there a difference in performance?

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• C++: Pass array created in the function call line

  - by Jarx

  How can I achieve a result like somebody would expect it according to the following code example: // assuming: void myFunction( int* arr ); myFunction( [ 123, 456, 789 ] ); // as syntactical sugar for... int values[] = { 123, 456, 789 }; myFunction( values ); The syntax I thought would work spit out a compile error. How can I define an argument array directly in the line where the function is called?

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• need help writing an emacs function

  - by murtaza52

  I want to write an emacs function that does the following - 1) Start a new shell named "abc". 2) Change the dir "/opt/abc" 3) In the dir run a shell command "python abc.py" I have written the following fucntion - (defun abc-server () (interactive) (shell-command "cd /opt/abc/") (shell-command "python abc.py")) The problem with the above - 1) It doesnt start a new shell 2) It doesnt change the dir. 3) When the cmd executes, it opens a browser window, which completely blocks any usage of emacs.

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• c# : Not getting "Usertype" for RegisterNewUser() function

  - by Preeti

  Hi, I am not getting "user type" for below function: (using Domino.dll in C#) _NotesRegister.RegisterNewUser(pLastn,pIdfile,pServer,pFirstn,pMiddle,pCertpw,pLocation,pComment, pMaildbpath,pForward,pUserpw,pAltName,pAltLang,Usertype); Regards, Preeti

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• "document.body is null" is fixed now I get ".setStyle is not a function"

  - by rymarchant

  Hi All, I'm running into a similar problem as this: link text I've done the fix as in the answer but now I end up with an error a couple lines later: $$([overlay = (new Element("div", {id: "mbOverlay"})).addEvent("click", close), center = new Element("div", {id: "mbCenter"})]).setStyle is not a function [Break on this error] ]).setStyle("display", "none") It's on this page: link text When you click on 'showreel' it should pop up into the media box, but instead it just goes to a new page. Any help would be much appreciated. Thanks!

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• Help me understand FFT function (Matlab)

  - by estourodepilha.com

  1) Besides the negative frequencies, which is the minimum frequency provided by the FFT function? Is it zero? 2) If it is zero how do we plot zero on a logarithmic scale? 3) The result is always symmetrical? Or it just appears to be symmetrical? 4) If I use abs(fft(y)) to compare 2 signals, may I lose some accuracy?

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• Exact cin equivalent function in python

  - by gkt.pro

  Suppose user enter this string at terminal 123 456 456 //then hit enter How do I scan these three (could be more) numbers in different variables in python Could be something like this: for i in range(1,n) m[i]=#WHAT FUNCTION SHOULD I PUT HERE In c++ we can easily use cin>>m[i] inside above loop to scan the variables. If i use input() or raw_input() , they would scan whole line in single variable.

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• C++ auto function return type implementation

  - by aaa

  hello. Is there macro, something like BOOST_AUTO, which would allow to emulate automatic return type deduction of function in C++? I mean something like trailing-return-type, http://en.wikipedia.org/wiki/C%2B%2B0x#Alternative_function_syntax thank you

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• How does one create a shared_ptr to pass to a function that takes a void *

  - by shaz

  That's pretty much it. I need to allocate memory and pass it to a function that takes a void *. I'd like to use a shared_ptr but I don't know how to do it.

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• function with multiple arguments

  - by Viral

  hi, how to pass multiple arguments in a single function in objective c? I want to pass 2 integer values and the return value is also integer.

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• How to use an overloaded function as an argument of function template?

  - by hpsmouse

  Hello, I think everyone has experience working with a code like the following: void fun(Type1&); void fun(Type2&); vector<Type1> vec; for_each(vec.begin(), vec.end(), fun); Of course that won't compile, because it's not clear which function to be passed. And what's your commonly-used solution to the problem?

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• Fatal error: Call to a member function get() in joomla module

  - by vipinsahu

  i am developing a module in joomla . all things goes fine except Fatal error: Call to a member function get() getting this error when i m using $username = $parem-get('username') but if i m using $username = 'foo'; all things goes fine Thanks

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