dftmtx

Parameters

n:

Real positive scalar number

Description

This is an Octave function This fuction gives a complex matrix of values whose product with a vector produces the discrete Fourier transform. This can also be achieved by directly using the fft function i.e. y=fft(x) is same as y=A*x where A=dftmtx(n).

Examples

1. dftmtx(3) ans = 1.00000 + 0.00000i 1.00000 + 0.00000i 1.00000 + 0.00000i 1.00000 + 0.00000i -0.50000 - 0.86603i -0.50000 + 0.86603i 1.00000 - 0.00000i -0.50000 + 0.86603i -0.50000 - 0.86603i