numpy.arcsinh(x[, out]) =
Inverse hyperbolic sine element-wise.
Parameters: |
x : array_like Input array. out : ndarray, optional Array into which the output is placed. Its type is preserved and it must be of the right shape to hold the output. See |
---|---|
Returns: |
out : ndarray Array of of the same shape as |
arcsinh
is a multivalued function: for each x
there are infinitely many numbers z
such that sinh(z) = x
. The convention is to return the z
whose imaginary part lies in [-pi/2, pi/2]
.
For real-valued input data types, arcsinh
always returns real output. For each value that cannot be expressed as a real number or infinity, it returns nan
and sets the invalid
floating point error flag.
For complex-valued input, arccos
is a complex analytical function that has branch cuts [1j, infj]
and [-1j, -infj]
and is continuous from the right on the former and from the left on the latter.
The inverse hyperbolic sine is also known as asinh
or sinh^-1
.
[R4] | M. Abramowitz and I.A. Stegun, “Handbook of Mathematical Functions”, 10th printing, 1964, pp. 86. http://www.math.sfu.ca/~cbm/aands/ |
[R5] | Wikipedia, “Inverse hyperbolic function”, http://en.wikipedia.org/wiki/Arcsinh |
>>> np.arcsinh(np.array([np.e, 10.0])) array([ 1.72538256, 2.99822295])
© 2008–2017 NumPy Developers
Licensed under the NumPy License.
https://docs.scipy.org/doc/numpy-1.12.0/reference/generated/numpy.arcsinh.html