log2

log2(x, out=None, **kwargs)

Base-2 logarithm of x.

Parameters:

x : ndarray or scalar

Input values.

out : ndarray or None

A location into which the result is stored. If provided, it must have the same shape and type as the input. If not provided or None, a freshly-allocated array is returned.

Returns:

y : ndarray

The logarithm base two of x, element-wise. This is a scalar if x is a scalar.

Notes

This function differs from the original numpy.log2 in the following way(s): - only ndarray or scalar is accpted as valid input, tuple of ndarray is not supported - broadcasting to out of different shape is currently not supported - when input is plain python numerics, the result will not be stored in the out param

Examples

>>> x = np.array([0, 1, 2, 2**4])
>>> np.log2(x)
array([-inf,   0.,   1.,   4.])