source: trunk/FACT++/sofa/src/rxr.c@ 18365

Last change on this file since 18365 was 18346, checked in by tbretz, 10 years ago
File size: 5.2 KB
Line 
1#include "sofa.h"
2
3void iauRxr(double a[3][3], double b[3][3], double atb[3][3])
4/*
5** - - - - - - -
6** i a u R x r
7** - - - - - - -
8**
9** Multiply two r-matrices.
10**
11** This function is part of the International Astronomical Union's
12** SOFA (Standards Of Fundamental Astronomy) software collection.
13**
14** Status: vector/matrix support function.
15**
16** Given:
17** a double[3][3] first r-matrix
18** b double[3][3] second r-matrix
19**
20** Returned:
21** atb double[3][3] a * b
22**
23** Note:
24** It is permissible to re-use the same array for any of the
25** arguments.
26**
27** Called:
28** iauCr copy r-matrix
29**
30** This revision: 2013 June 18
31**
32** SOFA release 2015-02-09
33**
34** Copyright (C) 2015 IAU SOFA Board. See notes at end.
35*/
36{
37 int i, j, k;
38 double w, wm[3][3];
39
40 for (i = 0; i < 3; i++) {
41 for (j = 0; j < 3; j++) {
42 w = 0.0;
43 for (k = 0; k < 3; k++) {
44 w += a[i][k] * b[k][j];
45 }
46 wm[i][j] = w;
47 }
48 }
49 iauCr(wm, atb);
50
51 return;
52
53/*----------------------------------------------------------------------
54**
55** Copyright (C) 2015
56** Standards Of Fundamental Astronomy Board
57** of the International Astronomical Union.
58**
59** =====================
60** SOFA Software License
61** =====================
62**
63** NOTICE TO USER:
64**
65** BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING SIX TERMS AND
66** CONDITIONS WHICH APPLY TO ITS USE.
67**
68** 1. The Software is owned by the IAU SOFA Board ("SOFA").
69**
70** 2. Permission is granted to anyone to use the SOFA software for any
71** purpose, including commercial applications, free of charge and
72** without payment of royalties, subject to the conditions and
73** restrictions listed below.
74**
75** 3. You (the user) may copy and distribute SOFA source code to others,
76** and use and adapt its code and algorithms in your own software,
77** on a world-wide, royalty-free basis. That portion of your
78** distribution that does not consist of intact and unchanged copies
79** of SOFA source code files is a "derived work" that must comply
80** with the following requirements:
81**
82** a) Your work shall be marked or carry a statement that it
83** (i) uses routines and computations derived by you from
84** software provided by SOFA under license to you; and
85** (ii) does not itself constitute software provided by and/or
86** endorsed by SOFA.
87**
88** b) The source code of your derived work must contain descriptions
89** of how the derived work is based upon, contains and/or differs
90** from the original SOFA software.
91**
92** c) The names of all routines in your derived work shall not
93** include the prefix "iau" or "sofa" or trivial modifications
94** thereof such as changes of case.
95**
96** d) The origin of the SOFA components of your derived work must
97** not be misrepresented; you must not claim that you wrote the
98** original software, nor file a patent application for SOFA
99** software or algorithms embedded in the SOFA software.
100**
101** e) These requirements must be reproduced intact in any source
102** distribution and shall apply to anyone to whom you have
103** granted a further right to modify the source code of your
104** derived work.
105**
106** Note that, as originally distributed, the SOFA software is
107** intended to be a definitive implementation of the IAU standards,
108** and consequently third-party modifications are discouraged. All
109** variations, no matter how minor, must be explicitly marked as
110** such, as explained above.
111**
112** 4. You shall not cause the SOFA software to be brought into
113** disrepute, either by misuse, or use for inappropriate tasks, or
114** by inappropriate modification.
115**
116** 5. The SOFA software is provided "as is" and SOFA makes no warranty
117** as to its use or performance. SOFA does not and cannot warrant
118** the performance or results which the user may obtain by using the
119** SOFA software. SOFA makes no warranties, express or implied, as
120** to non-infringement of third party rights, merchantability, or
121** fitness for any particular purpose. In no event will SOFA be
122** liable to the user for any consequential, incidental, or special
123** damages, including any lost profits or lost savings, even if a
124** SOFA representative has been advised of such damages, or for any
125** claim by any third party.
126**
127** 6. The provision of any version of the SOFA software under the terms
128** and conditions specified herein does not imply that future
129** versions will also be made available under the same terms and
130** conditions.
131*
132** In any published work or commercial product which uses the SOFA
133** software directly, acknowledgement (see www.iausofa.org) is
134** appreciated.
135**
136** Correspondence concerning SOFA software should be addressed as
137** follows:
138**
139** By email: sofa@ukho.gov.uk
140** By post: IAU SOFA Center
141** HM Nautical Almanac Office
142** UK Hydrographic Office
143** Admiralty Way, Taunton
144** Somerset, TA1 2DN
145** United Kingdom
146**
147**--------------------------------------------------------------------*/
148}
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