jax.numpy.frexp

jax.numpy.frexp(x)[source]

Decompose the elements of x into mantissa and twos exponent.

LAX-backend implementation of frexp(). Original docstring below.

frexp(x[, out1, out2], / [, out=(None, None)], *, where=True, casting=’same_kind’, order=’K’, dtype=None, subok=True[, signature, extobj])

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.

Returns

  • mantissa (ndarray) – Floating values between -1 and 1. This is a scalar if x is a scalar.

  • exponent (ndarray) – Integer exponents of 2. This is a scalar if x is a scalar.

See also

ldexp()

Compute y = x1 * 2**x2, the inverse of frexp.

Notes

Complex dtypes are not supported, they will raise a TypeError.

Examples

>>> 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.])