how to write code for fft?

i want to apply fft to the clutter signal with sampling frequency 5000 Hz.

[Walter Roberson]

What is a "clutter signal" ?

Do you need to write the fft routine yourself, or can you use fft() ?

Answer 1

[Pedro Villena]

 fs = 5000;
 t = 0:1/fs:1;
 signal = rand(size(t)); %%%%test data
 fft_in = reshape(signal(1:256*floor(numel(signal)/256)),256,floor(numel(signal)/256));
 fft_out = fft(fft_in);