function acosh

Returns the hyperbolic arcus cosine of its argument, which can be either real, complex or a matrix. By default, the returned value is in radians. This can be changed by specifying the switch /deg.

Syntax
result = acosh(X [, /deg])

Arguments
X:   a number (integer, real, complex) or a matrix, specifying the hyperbolic cosine of the angle to be returned. If X is a matrix, a matrix of the same size is returned where each element represents the result of the operation.


Switches
/deg:   The result will be in degrees


Examples
To find the angle (in degrees) whose hyperbolic cosine is 0.5, type:
   print acosh(0.5, /deg)

See also
function asinh
function atanh
category index: trigonometry