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 x . 
out2 : ndarray, optional 
Output array for the exponent. Must have the same shape as x . 
out : ndarray, None, or tuple of ndarray and None, optional 
A location into which the result is stored. If provided, it must have a shape that the inputs broadcast to. If not provided or None , a freshlyallocated array is returned. A tuple (possible only as a keyword argument) must have length equal to the number of outputs. 
where : array_like, optional 
This condition is broadcast over the input. At locations where the condition is True, the out array will be set to the ufunc result. Elsewhere, the out array will retain its original value. Note that if an uninitialized out array is created via the default out=None , locations within it where the condition is False will remain uninitialized.  **kwargs

For other keywordonly arguments, see the ufunc docs. 
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.])