# ATANH function

## Description

Inverse hyperbolic tangent function. ATANH(x) returns the inverse hyperbolic tangent of x. X must be in the ]-1..1[ interval (between -1 and 1, excluding -1 and 1).

The argument x can be a real number, a complex number, or a matrix. When it is a matrix, the function returns a matrix with the same dimensions and with the ATANH function applied to all elements.