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HP-UX Reference > A
atanh(3M)HP-UX 11i Version 2: December 2007 Update |
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NAMEatanh(), atanhf(), atanhl(), atanhw(), atanhq() — arc hyperbolic tangent functions DESCRIPTIONatanh() returns the arc hyperbolic tangent of x. Itanium-based System Onlyatanhf() is a float version of atanh(); it takes a float argument and returns a float result. atanhl() is a long double version of atanh(); it takes a long double argument and returns a long double result. atanhw() is an extended version of atanh(); it takes an extended argument and returns an extended result. atanhq() is equivalent to atanhl() on HP-UX systems. USAGETo use (for Itanium-based systems) atanhf(), atanhl(), atanhw(), or atanhq(), compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE options. To use (for Itanium-based systems) atanhw() or atanhq(), compile also with the -fpwidetypes option. To use any of these functions, make sure your program includes <math.h>, and link in the math library by specifying -lm on the compiler or linker command line. For more information, see the HP-UX Floating-Point Guide. RETURN VALUEatanh(±0) returns ±0. atanh(±1) returns ±Inf and raises the divide-by-zero floating-point exception. If |x| > 1.0, atanh() returns NaN and raises the invalid exception. If x is NaN, atanh() returns NaN. When it raises no other exception, whether atanh() raises the inexact exception is unspecified. |
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