fftfreq

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fftfreq#

class saiunit.fft.fftfreq(n, d=1.0, *, dtype=None, **kwargs)#

Return sample frequencies for the discrete Fourier transform.

Unit-aware implementation of numpy.fft.fftfreq(). When d carries a time unit, the returned frequencies carry the corresponding reciprocal (frequency) unit.

Parameters:

  • n (int) – Window length (number of samples in the FFT).

  • d (Union[saiunit.Quantity, Array, ndarray, number, bool]) – Sample spacing. If a Quantity with a time unit is given, the output will carry the matching frequency unit (e.g. second -> hertz).

Returns:

Array of length n containing sample frequencies.

Return type:

Union[saiunit.Quantity, Array, ndarray, number, bool]

See also

saiunit.fft.rfftfreq

Frequencies for rfft() / irfft().

Examples

>>> import saiunit as u
>>> import saiunit.fft as sufft
>>> freqs = sufft.fftfreq(4, 1.0 * u.second)
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