atanh(3) [netbsd man page]

ATANH(3)						   BSD Library Functions Manual 						  ATANH(3)

NAME

     atanh, atanhf -- inverse hyperbolic tangent function

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     double
     atanh(double x);

     float
     atanhf(float x);

DESCRIPTION

     The atanh() and atanhf() functions compute the inverse hyperbolic tangent of the real argument x.

RETURN VALUES

     If |x|>=1, atanh(x) and atanhf(x) return +inf, -inf or NaN, and sets the global variable errno to EDOM.

SEE ALSO

     acosh(3), asinh(3), exp(3), math(3)

HISTORY

     The atanh() function appeared in 4.3BSD.

BSD
								    May 6, 1991 							       BSD

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