atanh(3) - NetBSD Manual Pages

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ATANH(3)                NetBSD Library Functions Manual               ATANH(3)


NAME

     atanh, atanhf, atanhl -- inverse hyperbolic tangent function


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 hyper-
     bolic tangent of the real argument x.


RETURN VALUES

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


SEE ALSO

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


STANDARDS

     The atanh() function conforms to ISO/IEC 9899:1999 (``ISO C99'').


HISTORY

     The atanh() function appeared in 4.3BSD.

NetBSD 7.1                     January 29, 2013                     NetBSD 7.1