atanh.3 (3a8617a83f16ffc9db4f96e1f0f21af94078e6b1) atanh.3 (7a15a32a17f4c2cbeb6f842c4c6b1cf93e4639e7)
1.\" Copyright (c) 1985, 1991 Regents of the University of California.
2.\" All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice, this list of conditions and the following disclaimer.

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25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30.\" SUCH DAMAGE.
31.\"
32.\" from: @(#)atanh.3 5.2 (Berkeley) 5/6/91
1.\" Copyright (c) 1985, 1991 Regents of the University of California.
2.\" All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice, this list of conditions and the following disclaimer.

--- 16 unchanged lines hidden (view full) ---

25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30.\" SUCH DAMAGE.
31.\"
32.\" from: @(#)atanh.3 5.2 (Berkeley) 5/6/91
33.\" $Id: atanh.3,v 1.4 1993/10/29 22:57:24 jtc Exp $
33.\" $Id: atanh.3,v 1.1.1.1 1994/08/19 09:39:42 jkh Exp $
34.\"
35.Dd May 6, 1991
36.Dt ATANH 3
37.Os BSD 4.3
38.Sh NAME
34.\"
35.Dd May 6, 1991
36.Dt ATANH 3
37.Os BSD 4.3
38.Sh NAME
39.Nm atanh
40.Nd inverse hyperbolic tangent function
39.Nm atanh ,
40.Nm atanhf
41.Nd inverse hyperbolic tangent functions
41.Sh SYNOPSIS
42.Fd #include <math.h>
43.Ft double
44.Fn atanh "double x"
42.Sh SYNOPSIS
43.Fd #include <math.h>
44.Ft double
45.Fn atanh "double x"
46.Ft float
47.Fn atanhf "float x"
45.Sh DESCRIPTION
46The
47.Fn atanh
48.Sh DESCRIPTION
49The
50.Fn atanh
48function computes the inverse hyperbolic tangent
51and the
52.Fn atanhf
53functions compute the inverse hyperbolic tangent
49of the real
50argument
51.Ar x .
52For a discussion of error due to roundoff, see
53.Xr math 3 .
54.Sh RETURN VALUES
55The
56.Fn atanh
54of the real
55argument
56.Ar x .
57For a discussion of error due to roundoff, see
58.Xr math 3 .
59.Sh RETURN VALUES
60The
61.Fn atanh
57function
58returns the inverse hyperbolic tangent of
62and the
63.Fn atanhf
64functions
65return the inverse hyperbolic tangent of
59.Ar x
60if successful.
61On the
62.Tn VAX
63and
64.Tn Tahoe ,
65if the argument has absolute value
66bigger than or equal to 1,

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67if successful.
68On the
69.Tn VAX
70and
71.Tn Tahoe ,
72if the argument has absolute value
73bigger than or equal to 1,

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