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Back to Fourier Analysis

fftfreq

DFT sample frequencies

Syntax

f = fftfreq(n)
f = fftfreq(n, d)

Description

Returns the discrete Fourier Transform sample frequencies. For a signal of length `n` with sample spacing `d`, the frequencies are `[0, 1, ..., n/2-1, -n/2, ..., -1] / (d*n)` for even `n`.

Parameters

NameDescription
nWindow length (number of samples)
d(optional)Sample spacing (default: 1.0)

Returns

Array of sample frequencies

Examples

Try It
>> fftfreq(8, 0.1)

See Also

fftfftshift