source: branches/FACT++_lidctrl_usb/erfa/src/anpm.c@ 19875

Last change on this file since 19875 was 18711, checked in by tbretz, 10 years ago
Updated to ERFA 1.3.0 (no relevant code change except the leap second at the beginning of 2017)
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) 2013-2016, NumFOCUS Foundation.
18** Derived, with permission, from the SOFA library. See notes at end of file.
19*/
20{
21 double w;
22
23
24 w = fmod(a, ERFA_D2PI);
25 if (fabs(w) >= ERFA_DPI) w -= ERFA_DSIGN(ERFA_D2PI, a);
26
27 return w;
28
29}
30/*----------------------------------------------------------------------
31**
32**
33** Copyright (C) 2013-2016, NumFOCUS Foundation.
34** All rights reserved.
35**
36** This library is derived, with permission, from the International
37** Astronomical Union's "Standards of Fundamental Astronomy" library,
38** available from http://www.iausofa.org.
39**
40** The ERFA version is intended to retain identical functionality to
41** the SOFA library, but made distinct through different function and
42** file names, as set out in the SOFA license conditions. The SOFA
43** original has a role as a reference standard for the IAU and IERS,
44** and consequently redistribution is permitted only in its unaltered
45** state. The ERFA version is not subject to this restriction and
46** therefore can be included in distributions which do not support the
47** concept of "read only" software.
48**
49** Although the intent is to replicate the SOFA API (other than
50** replacement of prefix names) and results (with the exception of
51** bugs; any that are discovered will be fixed), SOFA is not
52** responsible for any errors found in this version of the library.
53**
54** If you wish to acknowledge the SOFA heritage, please acknowledge
55** that you are using a library derived from SOFA, rather than SOFA
56** itself.
57**
58**
59** TERMS AND CONDITIONS
60**
61** Redistribution and use in source and binary forms, with or without
62** modification, are permitted provided that the following conditions
63** are met:
64**
65** 1 Redistributions of source code must retain the above copyright
66** notice, this list of conditions and the following disclaimer.
67**
68** 2 Redistributions in binary form must reproduce the above copyright
69** notice, this list of conditions and the following disclaimer in
70** the documentation and/or other materials provided with the
71** distribution.
72**
73** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
74** the International Astronomical Union nor the names of its
75** contributors may be used to endorse or promote products derived
76** from this software without specific prior written permission.
77**
78** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
79** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
80** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
81** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
82** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
83** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
84** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
85** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
86** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
87** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
88** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
89** POSSIBILITY OF SUCH DAMAGE.
90**
91*/
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