mfft
multi-dimensional fft
Calling Sequence
[xk]=mfft(x,flag,dim)
Arguments
x
x(i,j,k,...) input signal in the form of a row vector whose values are arranged so that the i index runs the quickest, followed by the j index, etc.
flag
(-1) FFT or (1) inverse FFT
dim
dimension vector which gives the number of values of x for each of its indices
xk
output of multidimensional fft in same format as for x
Description
FFT for a multi-dimensional signal
For example for a three dimensional vector which has three points
along its first dimension, two points along its second
dimension and three points along its third dimension the row
vector is arranged as follows
and the dim vector is: dim=[3,2,3]
Examples