Alternative FFT algorithm .

Hi ,

I'm an italian boy, so i'm sorry if i don't speak english very well.
I have a model in Simulink that takes one vector of 128 values and calculates the FFT algorithm.
But the Matlab FFT algorithm, accepts, DOUBLE values in input, and instead i must use INT values.

I can't use C function (limitation),so i can use only matlab code.
Does exist an FFT algorithm that accepts INT values or can someone write me an alternative FFT algorithm ???

Thank you very well !

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