projects / unix-history / blame
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|---|---|---|
| f9628029 KM |
1 | .\" Copyright (c) 1985 Regents of the University of California. |
| 2 | .\" All rights reserved. The Berkeley software License Agreement | |
| 3 | .\" specifies the terms and conditions for redistribution. | |
| 4 | .\" | |
| 95f51977 | 5 | .\" @(#)asinh.3m 6.2 (Berkeley) 5/12/86 |
| f9628029 | 6 | .\" |
| 95f51977 | 7 | .TH ASINH 3M "May 12, 1986" |
| f9628029 | 8 | .UC 6 |
| e4b02bf2 | 9 | .ds up \fIulp\fR |
| 69561394 MAN |
10 | .SH NAME |
| 11 | asinh, acosh, atanh \- inverse hyperbolic functions | |
| 12 | .SH SYNOPSIS | |
| 13 | .nf | |
| 14 | .B #include <math.h> | |
| 15 | .PP | |
| 16 | .B double asinh(x) | |
| 17 | .B double x; | |
| 18 | .PP | |
| 19 | .B double acosh(x) | |
| 20 | .B double x; | |
| 21 | .PP | |
| 22 | .B double atanh(x) | |
| 23 | .B double x; | |
| 24 | .fi | |
| 25 | .SH DESCRIPTION | |
| 26 | These functions compute the designated inverse hyperbolic functions for real | |
| 27 | arguments. | |
| e4b02bf2 MAN |
28 | .SH ERROR (due to Roundoff etc.) |
| 29 | These functions inherit much of their error from log1p described in | |
| 30 | exp(3M). On a VAX, acosh is accurate to about 3 \*(ups, | |
| 31 | asinh and atanh to about 2 \*(ups. | |
| 32 | An \*(up is one \fIU\fRnit in the \fIL\fRast \fIP\fRlace carried. | |
| 69561394 | 33 | .SH DIAGNOSTICS |
| e4b02bf2 | 34 | Acosh returns the reserved operand on a VAX if the argument is less than 1. |
| 69561394 | 35 | .PP |
| e4b02bf2 MAN |
36 | Atanh returns the reserved operand on a VAX if the argument has absolute |
| 37 | value bigger than or equal to 1. | |
| 8220ec5a MK |
38 | .SH SEE ALSO |
| 39 | math(3M), exp(3M), infnan(3M) | |
| 69561394 | 40 | .SH AUTHOR |
| e4b02bf2 | 41 | W. Kahan, Kwok\-Choi Ng |