source: branches/FACT++_part_filenames/erfa/src/pvdpv.c@ 19365

Last change on this file since 19365 was 18711, checked in by tbretz, 8 years ago
Updated to ERFA 1.3.0 (no relevant code change except the leap second at the beginning of 2017)
File size: 4.0 KB
Line 
1#include "erfa.h"
2
3void eraPvdpv(double a[2][3], double b[2][3], double adb[2])
4/*
5** - - - - - - - - -
6** e r a P v d p v
7** - - - - - - - - -
8**
9** Inner (=scalar=dot) product of two pv-vectors.
10**
11** Given:
12** a double[2][3] first pv-vector
13** b double[2][3] second pv-vector
14**
15** Returned:
16** adb double[2] a . b (see note)
17**
18** Note:
19**
20** If the position and velocity components of the two pv-vectors are
21** ( ap, av ) and ( bp, bv ), the result, a . b, is the pair of
22** numbers ( ap . bp , ap . bv + av . bp ). The two numbers are the
23** dot-product of the two p-vectors and its derivative.
24**
25** Called:
26** eraPdp scalar product of two p-vectors
27**
28** Copyright (C) 2013-2016, NumFOCUS Foundation.
29** Derived, with permission, from the SOFA library. See notes at end of file.
30*/
31{
32 double adbd, addb;
33
34
35/* a . b = constant part of result. */
36 adb[0] = eraPdp(a[0], b[0]);
37
38/* a . bdot */
39 adbd = eraPdp(a[0], b[1]);
40
41/* adot . b */
42 addb = eraPdp(a[1], b[0]);
43
44/* Velocity part of result. */
45 adb[1] = adbd + addb;
46
47 return;
48
49}
50/*----------------------------------------------------------------------
51**
52**
53** Copyright (C) 2013-2016, NumFOCUS Foundation.
54** All rights reserved.
55**
56** This library is derived, with permission, from the International
57** Astronomical Union's "Standards of Fundamental Astronomy" library,
58** available from http://www.iausofa.org.
59**
60** The ERFA version is intended to retain identical functionality to
61** the SOFA library, but made distinct through different function and
62** file names, as set out in the SOFA license conditions. The SOFA
63** original has a role as a reference standard for the IAU and IERS,
64** and consequently redistribution is permitted only in its unaltered
65** state. The ERFA version is not subject to this restriction and
66** therefore can be included in distributions which do not support the
67** concept of "read only" software.
68**
69** Although the intent is to replicate the SOFA API (other than
70** replacement of prefix names) and results (with the exception of
71** bugs; any that are discovered will be fixed), SOFA is not
72** responsible for any errors found in this version of the library.
73**
74** If you wish to acknowledge the SOFA heritage, please acknowledge
75** that you are using a library derived from SOFA, rather than SOFA
76** itself.
77**
78**
79** TERMS AND CONDITIONS
80**
81** Redistribution and use in source and binary forms, with or without
82** modification, are permitted provided that the following conditions
83** are met:
84**
85** 1 Redistributions of source code must retain the above copyright
86** notice, this list of conditions and the following disclaimer.
87**
88** 2 Redistributions in binary form must reproduce the above copyright
89** notice, this list of conditions and the following disclaimer in
90** the documentation and/or other materials provided with the
91** distribution.
92**
93** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
94** the International Astronomical Union nor the names of its
95** contributors may be used to endorse or promote products derived
96** from this software without specific prior written permission.
97**
98** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
99** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
100** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
101** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
102** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
103** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
104** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
105** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
106** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
107** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
108** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
109** POSSIBILITY OF SUCH DAMAGE.
110**
111*/
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