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Help me about a code

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bayran arrieta
bayran arrieta on 18 Sep 2016
Commented: John D'Errico on 18 Sep 2016
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 Comment
John D'Errico
John D'Errico on 18 Sep 2016
Note this is absolutely not the code that MATLAB uses for fft.

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Answers (1)

Walter Roberson
Walter Roberson on 18 Sep 2016
Edited: Walter Roberson on 18 Sep 2016
  2 Comments
Walter Roberson
Walter Roberson on 18 Sep 2016
If you have the Signal Processing Toolbox then you can
dbtype dct

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