rfft

Purpose

Computes a real 1- or 2-D Fast Fourier transform.

Format

y = rfft(x)

Parameters:x (NxK real matrix) – data Returns:y (LxM matrix) – where \(L\) and \(M\) are the smallest powers of 2 greater than or equal to \(N\) and \(K\), respectively.

Remarks

Computes the RFFT of x, scaled by \(\frac{1}{(L*M)}\).

This uses a Temperton Fast Fourier algorithm.

If \(N\) or \(K\) is not a power of 2, x will be padded out with zeros before computing the transform.

See also

Functions rffti(), fft(), ffti(), fftm(), fftmi()