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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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• Step math function

  - by ekapek

  Hi I need function which returns: for any number from range = result [0.001,0.01) => 0.01 [0.01,0.1) => 0.1 [0.1,1) => 1 [1,10) => 10 [10,100) => 100 etc. My first idea was to use if, but this the worst way. Is there a simple solution?

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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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# : 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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• 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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• can't understand the url function used in the google taskque api documentation

  - by Bunny Rabbit

  import com.google.appengine.api.labs.taskqueue.Queue; import com.google.appengine.api.labs.taskqueue.QueueFactory; import static com.google.appengine.api.labs.taskqueue.TaskOptions.Builder.*; // ... Queue queue = QueueFactory.getDefaultQueue(); queue.add(url("/worker").param("key", key)) in the code example given on the google task queue documentation page i can't understand the url("/worker") function they are calling in the queues.add() invocation .

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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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• 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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• 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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• Selecting a Function Value Shows nvarchar(4000) on an Index

  - by Jason N. Gaylord

  I have a view that I'm trying to setup an Index for. One of the select columns for the view executes a user-defined function that has a return value of varchar(250). However, when I try to setup an Index on that column, I see a size of nvarchar(4000). Why is that and will that cause a problem if I continue to setup my index?

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• GDI+ Resize Function

  - by Tyler

  So my logic is flawed and I need a better and correct way to resize an image in my c# app I need a function similar to this setup public void ResizeImageForWeb(string OriginalFile, string NewFile, int MaxWidth, int MaxHeight, int Quality) { // Resize Code } Basically, I'm a web designer lost trying to programming a desktop app.

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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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• Postgre function for last inserted id

  - by Anton

  I am looking for function in postgre that returns last inserted id into table. In MS SQL there is SCOPE_IDENTITY(). Is something same in PostgreSQL? Please, do not advise use something like this: select max(id) from table

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