## 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 isy = 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`

.