ASINH
Section: Mathematical Library (3M)
Updated: May 12, 1986
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NAME
asinh, acosh, atanh - inverse hyperbolic functions
SYNOPSIS
#include <math.h>
double asinh(x)
double x;
double acosh(x)
double x;
double atanh(x)
double x;
DESCRIPTION
These functions compute the designated inverse hyperbolic functions for real
arguments.
ERROR (due to Roundoff etc.)
These functions inherit much of their error from log1p described in
exp(3M). On a VAX, acosh is accurate to about 3 ulps,
asinh and atanh to about 2 ulps.
An ulp is one Unit in the Last Place carried.
DIAGNOSTICS
Acosh returns the reserved operand on a VAX if the argument is less than 1.
Atanh returns the reserved operand on a VAX if the argument has absolute
value bigger than or equal to 1.
SEE ALSO
math(3M), exp(3M), infnan(3M)
AUTHOR
W. Kahan, Kwok-Choi Ng
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- ERROR (due to Roundoff etc.)
-
- DIAGNOSTICS
-
- SEE ALSO
-
- AUTHOR
-
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