numpy.frexp(x[, out1, out2]) =
Decompose the elements of x into mantissa and twos exponent.
Returns (mantissa
, exponent
), where x = mantissa * 2**exponent`
. The mantissa is lies in the open interval(-1, 1), while the twos exponent is a signed integer.
Parameters: |
x : array_like Array of numbers to be decomposed. out1 : ndarray, optional Output array for the mantissa. Must have the same shape as out2 : ndarray, optional Output array for the exponent. Must have the same shape as |
---|---|
Returns: |
(mantissa, exponent) : tuple of ndarrays, (float, int)
|
Complex dtypes are not supported, they will raise a TypeError.
>>> x = np.arange(9) >>> y1, y2 = np.frexp(x) >>> y1 array([ 0. , 0.5 , 0.5 , 0.75 , 0.5 , 0.625, 0.75 , 0.875, 0.5 ]) >>> y2 array([0, 1, 2, 2, 3, 3, 3, 3, 4]) >>> y1 * 2**y2 array([ 0., 1., 2., 3., 4., 5., 6., 7., 8.])
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https://docs.scipy.org/doc/numpy-1.12.0/reference/generated/numpy.frexp.html