You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: stft.m
    path of file: ./repos/deeplearningsourceseparation/tools/labrosa
    
    the code of the file until where you have to start completion: function D = stft(x, f, w, h, sr)
% D = stft(X, F, W, H, SR)                       Short-time Fourier transform.
%	Returns some frames of short-term Fourier transform of x.  Each 
%	column of the result is one F-point fft (default 256); each
%	successive frame is offset by H points (W/2) until X is exhausted.  
%       Data is hann-windowed at W pts (F), or rectangular if W=0, or 
%       with W if it is a vector.
%       Without output arguments, will plot like sgram (SR will get
%       axes right, defaults to 8000).

    
function D = stft(x, f, w, h, sr)
% D = stft(X, F, W, H, SR)                       Short-time Fourier transform.
%	Returns some frames of short-term Fourier transform of x.  Each 
%	column of the result is one F-point fft (default 256); each
%	successive frame is offset by H points (W/2) until X is exhausted.  
%       Data is hann-windowed at W pts (F), or rectangular if W=0, or 
%       with W if it is a vector.
%       Without output arguments, will plot like sgram (SR will get
%       axes right, defaults to 8000).
%	See also 'istft.m'.
% dpwe 1994may05.  Uses built-in 'fft'
% $Header: /home/empire6/dpwe/public_html/resources/matlab/pvoc/RCS/stft.m,v 1.4 2010/08/13 16:03:14 dpwe Exp $

if nargin < 2;  f = 256; end