Guardian Native C Library Calls Reference Manual (G06.28+, H06.05+)

Guardian Native C Library Calls (a - e) atanh(3)
RELATED INFORMATION
Functions: asin(3), asinh(3), acos(3), acosh(3), atan(3), atan2(3), fp_class(3), isnan(3).
STANDARDS CONFORMANCE
The XPG4 Version 2 specification leaves some features to the implementing vendor to define.
The following features are affected in the HP implementation:
• When used for IEEE floating-point values, this function does not set
errno to [EDOM] when the value of x is NaN.
• When used for Tandem floating-point values, this function does not
return the value NaN when an invalid parameter is passed.
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