ATANH(3) BSD Library Functions Manual ATANH(3)
NAME
atanh -- inverse hyperbolic tangent function
SYNOPSIS
#include <math.h>
double
atanh(double x);
long double
atanhl(long double x);
float
atanhf(float x);
DESCRIPTION
The atanh() function computes the inverse hyperbolic tangent of the real argument x.
SPECIAL VALUES
atanh(+-0) returns +-0.
atanh(+-1) returns +-infinity and raises the "divide-by-zero" floating-point exception.
atanh(x) returns a NaN and raises the "invalid" floating-point exception for |x| > 1.
VECTOR OPERATIONS
If you need to apply the atanh() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may
give significantly better performance:
#include <Accelerate/Accelerate.h>
vFloat vatanhf(vFloat x);
void vvatanhf(float *y, const float *x, const int *n);
void vvatanh(double *y, const double *x, const int *n);
SEE ALSO
acosh(3), asinh(3), exp(3), math(3)
STANDARDS
The atanh() function conforms to ISO/IEC 9899:2011.
4.3 Berkeley Distribution December 11, 2006 4.3 Berkeley Distribution
