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Help me about a code

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bayran arrieta
bayran arrieta 18 Sep 2016
댓글: John D'Errico 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)?

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John D'Errico
John D'Errico 18 Sep 2016
Note this is absolutely not the code that MATLAB uses for fft.

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답변(1개)

Walter Roberson
Walter Roberson 18 Sep 2016
편집: Walter Roberson 18 Sep 2016

  댓글 수: 2

bayran arrieta
bayran arrieta 18 Sep 2016
Do you know what is the equation exactly used in it? thank you beforehand
Walter Roberson
Walter Roberson 18 Sep 2016
If you have the Signal Processing Toolbox then you can
dbtype dct

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