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

Last change on this file was 18921, checked in by tbretz, 7 years ago
Updated to ERFA 1.4.0
File size: 3.7 KB
Line 
1#include "erfa.h"
2
3void eraPxp(double a[3], double b[3], double axb[3])
4/*
5** - - - - - - -
6** e r a P x p
7** - - - - - - -
8**
9** p-vector outer (=vector=cross) product.
10**
11** Given:
12** a double[3] first p-vector
13** b double[3] second p-vector
14**
15** Returned:
16** axb double[3] a x b
17**
18** Note:
19** It is permissible to re-use the same array for any of the
20** arguments.
21**
22** Copyright (C) 2013-2017, NumFOCUS Foundation.
23** Derived, with permission, from the SOFA library. See notes at end of file.
24*/
25{
26 double xa, ya, za, xb, yb, zb;
27
28
29 xa = a[0];
30 ya = a[1];
31 za = a[2];
32 xb = b[0];
33 yb = b[1];
34 zb = b[2];
35 axb[0] = ya*zb - za*yb;
36 axb[1] = za*xb - xa*zb;
37 axb[2] = xa*yb - ya*xb;
38
39 return;
40
41}
42/*----------------------------------------------------------------------
43**
44**
45** Copyright (C) 2013-2017, NumFOCUS Foundation.
46** All rights reserved.
47**
48** This library is derived, with permission, from the International
49** Astronomical Union's "Standards of Fundamental Astronomy" library,
50** available from http://www.iausofa.org.
51**
52** The ERFA version is intended to retain identical functionality to
53** the SOFA library, but made distinct through different function and
54** file names, as set out in the SOFA license conditions. The SOFA
55** original has a role as a reference standard for the IAU and IERS,
56** and consequently redistribution is permitted only in its unaltered
57** state. The ERFA version is not subject to this restriction and
58** therefore can be included in distributions which do not support the
59** concept of "read only" software.
60**
61** Although the intent is to replicate the SOFA API (other than
62** replacement of prefix names) and results (with the exception of
63** bugs; any that are discovered will be fixed), SOFA is not
64** responsible for any errors found in this version of the library.
65**
66** If you wish to acknowledge the SOFA heritage, please acknowledge
67** that you are using a library derived from SOFA, rather than SOFA
68** itself.
69**
70**
71** TERMS AND CONDITIONS
72**
73** Redistribution and use in source and binary forms, with or without
74** modification, are permitted provided that the following conditions
75** are met:
76**
77** 1 Redistributions of source code must retain the above copyright
78** notice, this list of conditions and the following disclaimer.
79**
80** 2 Redistributions in binary form must reproduce the above copyright
81** notice, this list of conditions and the following disclaimer in
82** the documentation and/or other materials provided with the
83** distribution.
84**
85** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
86** the International Astronomical Union nor the names of its
87** contributors may be used to endorse or promote products derived
88** from this software without specific prior written permission.
89**
90** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
91** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
92** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
93** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
94** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
95** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
96** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
97** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
98** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
99** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
100** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
101** POSSIBILITY OF SUCH DAMAGE.
102**
103*/
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