dft

dft — discrete Fourier transform

Calling sequence

[xf]=dft(x,flag);

`x`	: input vector
`flag`	: indicates dft (flag=-1) or idft (flag=1)
`xf`	: output vector

Function which computes dft of vector x.



n=8;omega = exp(-2*%pi*%i/n);
j=0:n-1;F=omega.^(j'*j);  //Fourier matrix
x=1:8;x=x(:);
F*x
fft(x,-1)
dft(x,-1)
inv(F)*x
fft(x,1)
dft(x,1)

C. B.