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

A vector y containing the result of the transformation. The length and content of y depends on x and type.

type	x	nrow(x)	y	nrow(y)	description
0	real signal with N samples	N	complex spectrum with N/2+1 values	N+2	real->complex forward dft note: only the first half of the conj. sym. complex spectrum is stored in y

See also

fft, ifft, dct, cepstrum, lpc, , complex arithmetic

<function list>