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tftb_fft

matlab compatible fft

Calling Sequence

y = tftb_fft(x, n)

Description

This function is much (100x) faster then mtlb_fft

Compute the FFT of A using subroutines from FFTW. The FFT is calculated along the first non-singleton dimension of the array. Thus if A is a matrix, `fft (A)' computes the FFT for each column of A.

If called with two arguments, N is expected to be an integer specifying the number of elements of A to use, or an empty matrix to specify that its value should be ignored. If N is larger than the dimension along which the FFT is calculated, then A is resized and padded with zeros. Otherwise, if N is smaller than the dimension along which the FFT is calculated, then A is truncated.

See also

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