title: get the code of functions in Matlab?
body: <p>I am wondering if we - the Matlab users can get the code of some functions in Matlab (like fft - fast fourier transform, dwt - descrete wavelet transform, and so on.) Just in case we want to edit something to adapt with what we need. 
  Is it possible in Matlab? 
  and if so, how can we get the code?
  Thank you.</p>