arctanh(x)
Return the "principal value" (for a description of this, see :None:None:`numpy.arctanh`) of arctanh(x)
. For real x such that abs(x) < 1
, this is a real number. If :None:None:`abs(x) > 1`, or if x is complex, the result is complex. Finally, :None:None:`x = 1` returns``inf`` and x=-1
returns -inf
.
For an arctanh() that returns NAN
when real x is not in the interval (-1,1)
, use :None:None:`numpy.arctanh` (this latter, however, does return +/-inf for x = +/-1
).
The value(s) whose arctanh is (are) required.
The inverse hyperbolic tangent(s) of the x value(s). If x was a scalar so is :None:None:`out`, otherwise an array is returned.
Compute the inverse hyperbolic tangent of x.
>>> np.set_printoptions(precision=4)
>>> from numpy.testing import suppress_warnings
... with suppress_warnings() as sup:
... sup.filter(RuntimeWarning)
... np.emath.arctanh(np.eye(2)) array([[inf, 0.], [ 0., inf]])
>>> np.emath.arctanh([1j]) array([0.+0.7854j])See :
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