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mfft
multi-dimensional fft. This function is obsolete.
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
x=[x(1,1,1),x(2,1,1),x(3,1,1),... x(1,2,1),x(2,2,1),x(3,2,1),... x(1,1,2),x(2,1,2),x(3,1,2),... x(1,2,2),x(2,2,2),x(3,2,2),... x(1,1,3),x(2,1,3),x(3,1,3),... x(1,2,3),x(2,2,3),x(3,2,3)]
and the dim
vector is:
dim=[3,2,3]
mfft
is superseeded by fft: mfft(x,flag,dim)
is equivalent to
matrix(fft(matrix(x,dim),flag),size(x))
.
This function is obsolete. |
mfft
See also
- fft — fast Fourier transform.
History
Version | Description |
5.5.0 | Function tagged as obsolete. Will be removed in 5.5.1. Please use fft instead. |
Report an issue | ||
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