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

Last change on this file since 18350 was 18348, checked in by tbretz, 9 years ago
File size: 3.7 KB
Line 
1#include "erfa.h"
2
3void eraRxp(double r[3][3], double p[3], double rp[3])
4/*
5** - - - - - - -
6** e r a R x p
7** - - - - - - -
8**
9** Multiply a p-vector by an r-matrix.
10**
11** Given:
12** r double[3][3] r-matrix
13** p double[3] p-vector
14**
15** Returned:
16** rp double[3] r * p
17**
18** Note:
19** It is permissible for p and rp to be the same array.
20**
21** Called:
22** eraCp copy p-vector
23**
24** Copyright (C) 2013-2015, NumFOCUS Foundation.
25** Derived, with permission, from the SOFA library. See notes at end of file.
26*/
27{
28 double w, wrp[3];
29 int i, j;
30
31/* Matrix r * vector p. */
32 for (j = 0; j < 3; j++) {
33 w = 0.0;
34 for (i = 0; i < 3; i++) {
35 w += r[j][i] * p[i];
36 }
37 wrp[j] = w;
38 }
39
40/* Return the result. */
41 eraCp(wrp, rp);
42
43 return;
44
45}
46/*----------------------------------------------------------------------
47**
48**
49** Copyright (C) 2013-2015, NumFOCUS Foundation.
50** All rights reserved.
51**
52** This library is derived, with permission, from the International
53** Astronomical Union's "Standards of Fundamental Astronomy" library,
54** available from http://www.iausofa.org.
55**
56** The ERFA version is intended to retain identical functionality to
57** the SOFA library, but made distinct through different function and
58** file names, as set out in the SOFA license conditions. The SOFA
59** original has a role as a reference standard for the IAU and IERS,
60** and consequently redistribution is permitted only in its unaltered
61** state. The ERFA version is not subject to this restriction and
62** therefore can be included in distributions which do not support the
63** concept of "read only" software.
64**
65** Although the intent is to replicate the SOFA API (other than
66** replacement of prefix names) and results (with the exception of
67** bugs; any that are discovered will be fixed), SOFA is not
68** responsible for any errors found in this version of the library.
69**
70** If you wish to acknowledge the SOFA heritage, please acknowledge
71** that you are using a library derived from SOFA, rather than SOFA
72** itself.
73**
74**
75** TERMS AND CONDITIONS
76**
77** Redistribution and use in source and binary forms, with or without
78** modification, are permitted provided that the following conditions
79** are met:
80**
81** 1 Redistributions of source code must retain the above copyright
82** notice, this list of conditions and the following disclaimer.
83**
84** 2 Redistributions in binary form must reproduce the above copyright
85** notice, this list of conditions and the following disclaimer in
86** the documentation and/or other materials provided with the
87** distribution.
88**
89** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
90** the International Astronomical Union nor the names of its
91** contributors may be used to endorse or promote products derived
92** from this software without specific prior written permission.
93**
94** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
95** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
96** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
97** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
98** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
99** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
100** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
101** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
102** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
103** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
104** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
105** POSSIBILITY OF SUCH DAMAGE.
106**
107*/
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