invfft

Command invfft performs the inverse Fourier transform of the given vectors. It assumes that the frequencies are ordered from 0 to N/2 followed by negative frequencies ranging from - (N - 1)/2 to -1 in units of 1/(N*Δ) where Δ is the sampling interval. The results are normalized by a factor 1/$\sqrt{{(N)}}$ so that a transform followed by an inverse transform should give the original vector. The resulting vectors are stored in the third and fourth arguments. Thus, invfft X Y V W inverse transforms X+iY into V+iW. Input vectors can be used as output vectors. See fft for more details.

invfft real-VECTOR ima-VECTOR real-VECTOR ima-VECTOR

fft, smooth, cmode, let, read, math, data