atanh(3) [freebsd man page]

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

NAME

     atanh, atanhf, atanhl -- inverse hyperbolic tangent functions

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     double
     atanh(double x);

     float
     atanhf(float x);

     long double
     atanhl(long double x);

DESCRIPTION

     The atanh(), atanhf(), and atanhl() functions compute the inverse hyperbolic tangent of the real argument x.  For a discussion of error due
     to roundoff, see math(3).

RETURN VALUES

     These functions return the inverse hyperbolic tangent of x if successful.	If the argument has absolute value 1, a divide-by-zero exception
     is raised and an infinity is returned.  If |x| > 1, an invalid exception is raised and an NaN is returned.

SEE ALSO

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

HISTORY

     The atanh(), atanhf(), and atanhl() functions appeared in 4.3BSD, FreeBSD 2.0, and FreeBSD 10.0, respectively.

BSD
								   June 9, 2013 							       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