arcsinh(x, /, out=None, *, where=True, casting='same_kind', order='K', dtype=None, subok=True[, signature, extobj]) = <ufunc 'arcsinh'>¶
Inverse hyperbolic sine element-wise.
- outndarray, None, or tuple of ndarray and None, optional
- wherearray_like, optional
out=None, locations within it where the condition is False will remain uninitialized.
For other keyword-only arguments, see the ufunc docs.
- outndarray or scalar
Array of the same shape as x. This is a scalar if x is a scalar.
arcsinhis 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,
arcsinhalways returns real output. For each value that cannot be expressed as a real number or infinity, it returns
nanand sets the invalid floating point error flag.
For complex-valued input,
arccosis 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
M. Abramowitz and I.A. Stegun, “Handbook of Mathematical Functions”, 10th printing, 1964, pp. 86. http://www.math.sfu.ca/~cbm/aands/
Wikipedia, “Inverse hyperbolic function”, https://en.wikipedia.org/wiki/Arcsinh
>>> np.arcsinh(np.array([np.e, 10.0])) array([ 1.72538256, 2.99822295])