log

Calculate the natural logarithm of each element (non-negative), that is, ln(x).

Parameter	Type	Description
x	array_like	Input array or scalar

Parameter	Type	Default Value	Description
out	ndarray/ndarray tuple	None	Location where the calculation result is stored. If provided, it must have a shape that the inputs broadcast to. If not provided, a freshly-allocated array is returned.
where	array_like	None	This condition is broadcast over the input. At locations where the condition is true, the out array stores the result. Elsewhere, the out array retains its original value.
**kwargs	-	-	Other keyword arguments. Refer to the NumPy official document Universal functions (ufunc).

Type	Description
ndarray/scalar	Natural logarithm of each element (non-negative)

>>> import numpy as np
>>> np.log(1.0)
0.0
>>> x = np.array([1.0, np.e, np.e**2, 0])
>>> np.log(x)
array([  0.,   1.,   2., -inf])
>>>

Parent topic: Basic Operation Functions