FFTN N-Dimensional Forward FFT

Section: Transforms/Decompositions

Usage

Computes the DFT of an N-dimensional numerical array along all dimensions. The general syntax for its use is 
  y = fftn(x)

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

  y = fftn(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 fftn function is implemented by a sequence of calls to fft.