IFFTN IFFTN N-Dimensional Inverse FFT 

Usage

Computes the inverse DFT of an N-dimensional numerical array along all
dimensions.  The general syntax for its use is

  y = ifftn(x)

which computes the same-size inverse  FFTs for each dimension of x.
Alternately, you can specify the size vector

  y = ifftn(x,dims)

where dims is a vector of sizes.  The array x is zero padded
or truncated as necessary in each dimension so that the output
is of size dims. The ifftn function is implemented by a sequence
of calls to ifft.
