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
Mac OS X 10.9.1 - Generated Tue Jan 7 07:22:42 CST 2014