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Annotation of mandoc/regress/roff/if/close-rules.in, Revision 1.2

1.1       kristaps    1: .\" Copyright (c) 1985, 1991 Regents of the University of California.
                      2: .\" All rights reserved.
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                      4: .\" Redistribution and use in source and binary forms, with or without
                      5: .\" modification, are permitted provided that the following conditions
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                      7: .\" 1. Redistributions of source code must retain the above copyright
                      8: .\"    notice, this list of conditions and the following disclaimer.
                      9: .\" 2. Redistributions in binary form must reproduce the above copyright
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                     11: .\"    documentation and/or other materials provided with the distribution.
                     12: .\" 4. Neither the name of the University nor the names of its contributors
                     13: .\"    may be used to endorse or promote products derived from this software
                     14: .\"    without specific prior written permission.
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                     16: .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     17: .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     18: .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     19: .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     20: .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     21: .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     22: .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     23: .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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                     28: .\"     from: @(#)erf.3        6.4 (Berkeley) 4/20/91
                     29: .\" $FreeBSD$
                     30: .\"
                     31: .Dd April 20, 1991
                     32: .Dt ERF 3
                     33: .Os
                     34: .Sh NAME
                     35: .Nm erf ,
                     36: .Nm erff ,
                     37: .Nm erfc ,
                     38: .Nm erfcf
                     39: .Nd error function operators
                     40: .Sh SYNOPSIS
                     41: .In math.h
                     42: .Ft double
                     43: .Fn erf "double x"
                     44: .Ft float
                     45: .Fn erff "float x"
                     46: .Ft double
                     47: .Fn erfc "double x"
                     48: .Ft float
                     49: .Fn erfcf "float x"
                     50: .Sh DESCRIPTION
                     51: These functions calculate the error function of
                     52: .Fa x .
                     53: .Pp
                     54: The
                     55: .Fn erf
                     56: and the
                     57: .Fn erff
                     58: functions calculate the error function of x; where
                     59: .Bd -ragged -offset indent
                     60: .if n \{\
                     61: erf(x) = 2/sqrt(pi)\(**\|integral from 0 to x of exp(\-t\(**t) dt.
                     62: 1234 \} asdf
                     63: 1234 \} asdf
                     64: .if t \{\
                     65: erf\|(x) :=
                     66: (2/\(sr\(*p)\|\(is\d\s8\z0\s10\u\u\s8x\s10\d\|exp(\-t\u\s82\s10\d)\|dt.
                     67: 4321 \} fdsa
                     68: 4321 \} fdsa
                     69: .Ed
                     70: .Pp
                     71: The
                     72: .Fn erfc
                     73: and the
                     74: .Fn erfcf
                     75: functions calculate the complementary error function of
                     76: .Fa x ;
                     77: that is
                     78: .Fn erfc
                     79: subtracts the result of the error function
                     80: .Fn erf x
                     81: from 1.0.
                     82: This is useful, since for large
                     83: .Fa x
                     84: places disappear.
                     85: .Sh SEE ALSO
                     86: .Xr math 3
                     87: .Sh HISTORY
                     88: The
                     89: .Fn erf
                     90: and
                     91: .Fn erfc
                     92: functions appeared in
                     93: .Bx 4.3 .