how to vectorize these for loop?

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serena dsouza
serena dsouza 2017-8-9
编辑： Jan 2017-8-9
clc;
clear all;
close all;
tic;
[s,fs]=audioread('sample.wav')
fdatool
l=length(s);
figure('name','speechsignal');
subplot(3,3,1);
plot (s);
title('speech signal');
xlabel('samples---->');
ylabel('amplitudes---->');
t=(0:1:l-1)/fs;
subplot(3,3,2);
plot(t,s);
title('Speech signal on time axis');
xlabel('time(s) ---->');
ylabel('Amplitude ---->');
f_d=0.1;
f_s=floor(l*f_d);
overlap=f_s/2;
no_f=floor((l/f_s)*2-1);
M=zeros(f_s,no_f);
for j=1:no_f;%i=1:frame size;
for i=1:f_s;%j=1:no of frames;
M(i,j)=s(((j-1)*overlap)+i);
end;
end;

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采纳的回答

Walter Roberson
Walter Roberson 2017-8-9
编辑：Walter Roberson 2017-8-9
First improvement:
for j=1:no_f %i=1:frame size; j=1:no of frames;
M(1:f_s, j)=s(((j-1)*overlap)+(1:f_s));
end
Second improvement:
M = s( bsxfun(@plus, (1:f_s).', ((1:no_f)-1)*overlap ) );
Third improvement: replace much of your code with a call to buffer()
  2 个评论
Jan
Jan 2017-8-9
编辑：Jan 2017-8-9
@serena dsouza: Further improvement: Omit the brute celaring header clc; clear all; close all;, which is cargo cult only and wastes a lot of time, when all functions must be imported from the slow hard disk afterwards. See Stephen's comment .

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