Programmer Guide/Command Reference/EVAL/dft

dft

Discrete Fourier Transform.

Usage:

dft(xr, 0)

dft(xr)

Function:

Forward DFT of the real signal xr. nrow(xr) must be even.

Result:

A complex spectrum with nrow(xr)/2 complex elements (1st half).

Usage:

dft(xc, 1)

Function:

Forward DFT of the complex signal xc.

Result:

A complex spectrum of the same type as xc.

Usage:

dft(xc, 2)

Function:

Inverse DFT of the symmetrical complex spectrum.

Result:

A real signal with nrow(xc)*2 elements.

Usage:

dft(xc, 3)

Function:

Inverse DFT of the complex spectrum xc.

Result:

A complex spectrum of the same type as xc.