FFT speed problem in C Coder

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Jongmin Kim
Jongmin Kim 2021-12-7
回答： Jongmin Kim 2021-12-8
Dear all,
I used Matlab Coder to convert a function containing FFT into C code.
But it is very slow.
I've checked some of the C code.
It looks like the FFT operation is not optimized.
I inquire if I can use FFTW or MKL. (I don't know in which menu of the coder app these functions are available.)
I can use both Matlab C Coder and Embedded Coder.
I need help with this issue.

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采纳的回答

Jongmin Kim
Jongmin Kim 2021-12-8
I looked at the code generated by the coder.
  • fft.h/fft.c
  • FFTImplementationCallback.h/FFTImplementationCallback.c
Do I have to edit this file myself?

更多回答（1 个）

Raghu Boggavarapu
Raghu Boggavarapu 2021-12-7
If you have generated MEX code, generated code will by default have calls to FFTW library. However, if you are generating standalone code, code generator will produce code for FFT algorithms. If you have a FFTW library installed, please follow the instructions in the page Abstract class for specifying an FFTW library for FFTW calls in generated code - MATLAB (mathworks.com) to integrate the Library with MATLAB Coder generated code.

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