fft2

2-D fast Fourier transform.

Syntax

• Y = fft2(X)
• Y = fft2(X, m, n)

Input argument

• X - Input array.
• m - Number of transform rows.
• n - Number of transform columns.

Output argument

• Y - a vector, matrix, N-D array: frequency domain representation.

Description

Y = fft2(X) returns the two-dimensional Fourier transform of X using a Fast Fourier Transform (FFT) algorithm.

Optional arguments m and n may be used specify the number of rows and columns of X to use.

If either of these is larger than the size of X, X is resized and padded with zeros.

If X is a multi-dimensional matrix, each two-dimensional sub-matrix of X is treated separately.

Example

R = fft2(eye(5, 5), 2, 3)

See also

fftn, fft.

History

Author

Allan CORNET