<< fft

FFTW

fftn >>

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fft2

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2-D fast Fourier transform.

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Syntax

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Y = fft2(X)

Y = fft2(X, m, n)

Input argument

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X

Input array.

m

Number of transform rows.

n

Number of transform columns.

Output argument

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Y

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

Description

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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

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

See also

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fftn, fft.

History

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Version	Description
1.0.0	initial version

Author

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Allan CORNET