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| Commit | Line | Data |
|---|---|---|
| 69561394 | 1 | From Prof. Kahan at UC at Berkeley |
| e4b02bf2 | 2 | .TH ASINH 3M "4 August 1985" |
| 69561394 | 3 | .UC 4 |
| e4b02bf2 | 4 | .ds up \fIulp\fR |
| 69561394 MAN |
5 | .SH NAME |
| 6 | asinh, acosh, atanh \- inverse hyperbolic functions | |
| 7 | .SH SYNOPSIS | |
| 8 | .nf | |
| 9 | .B #include <math.h> | |
| 10 | .PP | |
| 11 | .B double asinh(x) | |
| 12 | .B double x; | |
| 13 | .PP | |
| 14 | .B double acosh(x) | |
| 15 | .B double x; | |
| 16 | .PP | |
| 17 | .B double atanh(x) | |
| 18 | .B double x; | |
| 19 | .fi | |
| 20 | .SH DESCRIPTION | |
| 21 | These functions compute the designated inverse hyperbolic functions for real | |
| 22 | arguments. | |
| 23 | .SH SEE ALSO | |
| e4b02bf2 MAN |
24 | intro(3M), exp(3M), infnan(3M) |
| 25 | .SH ERROR (due to Roundoff etc.) | |
| 26 | These functions inherit much of their error from log1p described in | |
| 27 | exp(3M). On a VAX, acosh is accurate to about 3 \*(ups, | |
| 28 | asinh and atanh to about 2 \*(ups. | |
| 29 | An \*(up is one \fIU\fRnit in the \fIL\fRast \fIP\fRlace carried. | |
| 69561394 | 30 | .SH DIAGNOSTICS |
| e4b02bf2 | 31 | Acosh returns the reserved operand on a VAX if the argument is less than 1. |
| 69561394 | 32 | .PP |
| e4b02bf2 MAN |
33 | Atanh returns the reserved operand on a VAX if the argument has absolute |
| 34 | value bigger than or equal to 1. | |
| 69561394 | 35 | .SH AUTHOR |
| e4b02bf2 | 36 | W. Kahan, Kwok\-Choi Ng |