Help me about a code
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If this code that I did it of fast Fourier transform that matlab use in y=fft(x),
X = xlsread('Arrastre.xls',1,'B1:B1441');%presiom
[N,M] = size(X);
y = zeros (N,1);
n = 0 : N-1;
for k = 0 : N-1
y(k+1) = sum(exp(-j*2*pi*n*k/N)*X);
end
y;
How is the code for DCT or Discrete Fourier transform that matlab use for y=dct(x)?
1 个评论
John D'Errico
2016-9-18
Note this is absolutely not the code that MATLAB uses for fft.
回答（1 个）
Walter Roberson
2016-9-18
编辑：Walter Roberson
2016-9-18
0 个投票
2 个评论
bayran arrieta
2016-9-18
编辑：bayran arrieta
2016-9-18
Walter Roberson
2016-9-18
If you have the Signal Processing Toolbox then you can
dbtype dct
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2016-9-18
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