.. highlightlang:: us

.. index:: acosh

.. _acosh:

acosh
=====

.. us.tag  acosh ENGLISH math-trigo

:ref:`acosh` calculates the hyperbolic arccosine.

.. function::  r = acosh(m)

.. us.return

**Return Value**

*r* is the hyperbolic arccosine of *m*.

.. us.params

**Parameters**

.. uparam:: m

   *m* is a real or complex matrix.

.. us.comment

**Comment**

Algorithm: ``log(x + sqrt(x .* x - 1))``.

.. seealso::
   :ref:`overview-mathematic`,
   :ref:`cosh`

:sub:`id-1578379`