numpy.lib.scimath

Wrapper functions to more user-friendly calling of certain math functions whose output data-type is different than the input data-type in certain domains of the input.

For example, for functions like log with branch cuts, the versions in this module provide the mathematically valid answers in the complex plane:

>>> import math
>>> np.emath.log(-math.exp(1)) == (1+1j*math.pi)
True

Similarly, sqrt, other base logarithms, power and trig functions are correctly handled. See their respective docstrings for specific examples.

Functions

arccos(x)	Compute the inverse cosine of x.
arcsin(x)	Compute the inverse sine of x.
arctanh(x)	Compute the inverse hyperbolic tangent of x.
log(x)	Compute the natural logarithm of x.