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Help me about a code

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bayran arrieta
bayran arrieta 2016-9-18
关闭： MATLAB Answer Bot 2021-8-20
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
John D'Errico 2016-9-18
Note this is absolutely not the code that MATLAB uses for fft.

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Walter Roberson
Walter Roberson 2016-9-18
编辑：Walter Roberson 2016-9-18
  2 个评论
bayran arrieta
bayran arrieta 2016-9-18
编辑：bayran arrieta 2016-9-18
Do you know what is the equation exactly used in it? thank you beforehand
Walter Roberson
Walter Roberson 2016-9-18
If you have the Signal Processing Toolbox then you can
dbtype dct

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