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Help me about a code

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bayran arrieta
bayran arrieta le 18 Sep 2016
Clôturé : MATLAB Answer Bot le 20 Août 2021
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 commentaire
John D'Errico
John D'Errico le 18 Sep 2016
Note this is absolutely not the code that MATLAB uses for fft.

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Walter Roberson
Walter Roberson le 18 Sep 2016
Modifié(e) : Walter Roberson le 18 Sep 2016
  2 commentaires
bayran arrieta
bayran arrieta le 18 Sep 2016
Modifié(e) : bayran arrieta le 18 Sep 2016
Do you know what is the equation exactly used in it? thank you beforehand
Walter Roberson
Walter Roberson le 18 Sep 2016
If you have the Signal Processing Toolbox then you can
dbtype dct

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