# ifft2

Two-dimensional inverse fast Fourier transform.

## Syntax

x = ifft2(f)

x = ifft2(f, m, n)

## Inputs

`f`- The frequency spectrum to be transformed into the time domain.
`m`- The number of columns in the inverse FFT.
`n`- The number of rows in the inverse FFT.

## Outputs

`x`- The time domain representation of
`f`.

## Comments

The dimensions of the inverse FFT, `m` and `n`, default
to the dimensions of the matrix being transformed. If they are not the defaults, the
spectrum matrix is either truncated or extended with zeros symmetrically with respect to the
Nyquist frequency. Currently, the dimension can only be changed for a conjugate symmetric
input spectrum.

fftn uses the FFTW library.