dft

Inverse or forward discrete fourier transform (dft).

Usage

dft(x {, type)

xthe data vector to be transformed

type

selects the data type of the argument and result and the transformation to be performed (default=0)

Result

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.