source: trunk/FACT++/erfa/src/anpm.c@ 18350

Last change on this file since 18350 was 18348, checked in by tbretz, 9 years ago
File size: 3.4 KB
Line 
1#include "erfa.h"
2
3double eraAnpm(double a)
4/*
5** - - - - - - - -
6** e r a A n p m
7** - - - - - - - -
8**
9** Normalize angle into the range -pi <= a < +pi.
10**
11** Given:
12** a double angle (radians)
13**
14** Returned (function value):
15** double angle in range +/-pi
16**
17** Copyright (C) 2013-2015, NumFOCUS Foundation.
18** Derived, with permission, from the SOFA library. See notes at end of file.
19*/
20{
21 double w;
22
23 w = fmod(a, ERFA_D2PI);
24 if (fabs(w) >= ERFA_DPI) w -= ERFA_DSIGN(ERFA_D2PI, a);
25
26 return w;
27
28}
29/*----------------------------------------------------------------------
30**
31**
32** Copyright (C) 2013-2015, NumFOCUS Foundation.
33** All rights reserved.
34**
35** This library is derived, with permission, from the International
36** Astronomical Union's "Standards of Fundamental Astronomy" library,
37** available from http://www.iausofa.org.
38**
39** The ERFA version is intended to retain identical functionality to
40** the SOFA library, but made distinct through different function and
41** file names, as set out in the SOFA license conditions. The SOFA
42** original has a role as a reference standard for the IAU and IERS,
43** and consequently redistribution is permitted only in its unaltered
44** state. The ERFA version is not subject to this restriction and
45** therefore can be included in distributions which do not support the
46** concept of "read only" software.
47**
48** Although the intent is to replicate the SOFA API (other than
49** replacement of prefix names) and results (with the exception of
50** bugs; any that are discovered will be fixed), SOFA is not
51** responsible for any errors found in this version of the library.
52**
53** If you wish to acknowledge the SOFA heritage, please acknowledge
54** that you are using a library derived from SOFA, rather than SOFA
55** itself.
56**
57**
58** TERMS AND CONDITIONS
59**
60** Redistribution and use in source and binary forms, with or without
61** modification, are permitted provided that the following conditions
62** are met:
63**
64** 1 Redistributions of source code must retain the above copyright
65** notice, this list of conditions and the following disclaimer.
66**
67** 2 Redistributions in binary form must reproduce the above copyright
68** notice, this list of conditions and the following disclaimer in
69** the documentation and/or other materials provided with the
70** distribution.
71**
72** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
73** the International Astronomical Union nor the names of its
74** contributors may be used to endorse or promote products derived
75** from this software without specific prior written permission.
76**
77** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
78** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
79** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
80** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
81** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
82** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
83** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
84** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
85** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
86** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
87** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
88** POSSIBILITY OF SUCH DAMAGE.
89**
90*/
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