source: trunk/FACT++/erfa/src/rxr.c

Last change on this file was 18921, checked in by tbretz, 7 years ago
Updated to ERFA 1.4.0
File size: 3.8 KB
Line 
1#include "erfa.h"
2
3void eraRxr(double a[3][3], double b[3][3], double atb[3][3])
4/*
5** - - - - - - -
6** e r a R x r
7** - - - - - - -
8**
9** Multiply two r-matrices.
10**
11** Given:
12** a double[3][3] first r-matrix
13** b double[3][3] second r-matrix
14**
15** Returned:
16** atb double[3][3] a * b
17**
18** Note:
19** It is permissible to re-use the same array for any of the
20** arguments.
21**
22** Called:
23** eraCr copy r-matrix
24**
25** Copyright (C) 2013-2017, NumFOCUS Foundation.
26** Derived, with permission, from the SOFA library. See notes at end of file.
27*/
28{
29 int i, j, k;
30 double w, wm[3][3];
31
32
33 for (i = 0; i < 3; i++) {
34 for (j = 0; j < 3; j++) {
35 w = 0.0;
36 for (k = 0; k < 3; k++) {
37 w += a[i][k] * b[k][j];
38 }
39 wm[i][j] = w;
40 }
41 }
42 eraCr(wm, atb);
43
44 return;
45
46}
47/*----------------------------------------------------------------------
48**
49**
50** Copyright (C) 2013-2017, NumFOCUS Foundation.
51** All rights reserved.
52**
53** This library is derived, with permission, from the International
54** Astronomical Union's "Standards of Fundamental Astronomy" library,
55** available from http://www.iausofa.org.
56**
57** The ERFA version is intended to retain identical functionality to
58** the SOFA library, but made distinct through different function and
59** file names, as set out in the SOFA license conditions. The SOFA
60** original has a role as a reference standard for the IAU and IERS,
61** and consequently redistribution is permitted only in its unaltered
62** state. The ERFA version is not subject to this restriction and
63** therefore can be included in distributions which do not support the
64** concept of "read only" software.
65**
66** Although the intent is to replicate the SOFA API (other than
67** replacement of prefix names) and results (with the exception of
68** bugs; any that are discovered will be fixed), SOFA is not
69** responsible for any errors found in this version of the library.
70**
71** If you wish to acknowledge the SOFA heritage, please acknowledge
72** that you are using a library derived from SOFA, rather than SOFA
73** itself.
74**
75**
76** TERMS AND CONDITIONS
77**
78** Redistribution and use in source and binary forms, with or without
79** modification, are permitted provided that the following conditions
80** are met:
81**
82** 1 Redistributions of source code must retain the above copyright
83** notice, this list of conditions and the following disclaimer.
84**
85** 2 Redistributions in binary form must reproduce the above copyright
86** notice, this list of conditions and the following disclaimer in
87** the documentation and/or other materials provided with the
88** distribution.
89**
90** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
91** the International Astronomical Union nor the names of its
92** contributors may be used to endorse or promote products derived
93** from this software without specific prior written permission.
94**
95** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
96** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
97** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
98** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
99** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
100** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
101** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
102** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
103** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
104** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
105** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
106** POSSIBILITY OF SUCH DAMAGE.
107**
108*/
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