call matlab ifft from c

Question

I have a short question: I would like to call the matlab fuction ifft from c code （inverse fast fourier transform）

I was trying to understand the matlab api for c , but I could not find any example on how to pass the arguments or how to call an internal fuction of matlab within c code

any hint will be greatly appreciated !

Julia

Matlab's FFT is implemented on top of [FFTW](http://www.fftw.org/). So you're better off just using that directly. — Oliver Charlesworth, Dec 13 '17 at 13:02
ok sounds fair enough , I thought it would easier calling matlab than fftw — Julia Fischer, Dec 13 '17 at 13:48

score 0 · Answer 1 · answered Dec 23 '17 at 14:28

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You can generate C code from a script using the MATLAB Coder app. That should make the ifft callable. The ugliest way to do it would be to exec() matlab and re-ingest its output. Oliver's answer is certainly the cleanest and best route though.

answered Dec 23 '17 at 14:28

EddingtonsMonkey

112
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score 0 · Answer 2 · answered Jan 10 '18 at 19:11

The way to use a c/c++ based function for MATLAB to call is to build a mex file. Basic steps are :

write a c/c++ script, say you ifft()
build it (using visual studio for example) to generate a .mex (.mexw64 for 64-bit system) file.
call your ifft() from your MATLAB code once you have your .mex file

The interface between the MATLAB and c/c++ code should follow certain rules. Here is an example you can refer to:

https://www.mathworks.com/help/matlab/matlab_external/standalone-example.html

Here is how to build the c/c++ script into a .mex file: https://www.mathworks.com/help/matlab/ref/mex.html

The .mex file is pretty much like a library. After you build it, put it in the same folder as the MATLAB script, then you can run it.

Hope it helps.

call matlab ifft from c

2 Answers2