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librosa.util.abs2

librosa.util.abs2(x, dtype=None)[source]

Compute the squared magnitude of a real or complex array.

This function is equivalent to calling np.abs(x)**2 but it is slightly more efficient.

Parameters:

xnp.ndarray or scalar, real or complex typed: The input data, either real (float32, float64) or complex (complex64, complex128) typed
dtypenp.dtype, optional: The data type of the output array. If not provided, it will be inferred from x

Returns:

Examples

>>> librosa.util.abs2(3 + 4j)
25.0

>>> librosa.util.abs2((0.5j)**np.arange(8))
array([1.000e+00, 2.500e-01, 6.250e-02, 1.562e-02, 3.906e-03, 9.766e-04,
   2.441e-04, 6.104e-05])