numpy.lib.scimath.arcsin

lib.scimath.arcsin(x)[source]

Compute the inverse sine of x.

Return the “principal value” (for a description of this, see numpy.arcsin) of the inverse sine of x. For real x such that abs(x) <= 1, this is a real number in the closed interval \([-\pi/2, \pi/2]\). Otherwise, the complex principle value is returned.

Parameters:

xarray_like or scalar

The value(s) whose arcsin is (are) required.

Returns:

outndarray or scalar

The inverse sine(s) of the x value(s). If x was a scalar, so is out, otherwise an array object is returned.

See also

numpy.arcsin

Notes

For an arcsin() that returns NAN when real x is not in the interval [-1,1], use numpy.arcsin.

Examples

Try it in your browser!

>>> import numpy as np
>>> np.set_printoptions(precision=4)

>>> np.emath.arcsin(0)
0.0

>>> np.emath.arcsin([0,1])
array([0.    , 1.5708])

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