Signal Toolkit - dftmtx

Function File: d = dftmtx (n)

Compute the n-by-n Fourier transformation matrix. This is the matrix d such that the Fourier transform of a column vector of length n is given by dftmtx(n) * x and the inverse Fourier transform is given by inv(dftmtx(n)) * x.

In general this is less efficient than calling the fft and ifft functions directly.

See also: fft, ifft.