rfa 0.5.9

A port ERFA to Rust.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86

use crate::rfam::*;
use super::{pwf06::*, fw2m::*, pmat06::*, };
use crate::vector_matrix::{matrix_ops::{rxr::*, tr::*}, copy_ext::*};
///  Frame bias and precession, IAU 2006.
///
///  Given:
///     date1,date2  double         TT as a 2-part Julian Date (Note 1)
///
///  Returned:
///     rb           double[3][3]   frame bias matrix (Note 2)
///     rp           double[3][3]   precession matrix (Note 3)
///     rbp          double[3][3]   bias-precession matrix (Note 4)
///
///  Notes:
///
///  1) The TT date date1+date2 is a Julian Date, apportioned in any
///     convenient way between the two arguments.  For example,
///     JD(TT)=2450123.7 could be expressed in any of these ways,
///     among others:
///
///             date1         date2
///
///         2450123.7           0.0       (JD method)
///         2451545.0       -1421.3       (J2000 method)
///         2400000.5       50123.2       (MJD method)
///         2450123.5           0.2       (date & time method)
///
///     The JD method is the most natural and convenient to use in
///     cases where the loss of several decimal digits of resolution
///     is acceptable.  The J2000 method is best matched to the way
///     the argument is handled internally and will deliver the
///     optimum resolution.  The MJD method and the date & time methods
///     are both good compromises between resolution and convenience.
///
///  2) The matrix rb transforms vectors from GCRS to mean J2000.0 by
///     applying frame bias.
///
///  3) The matrix rp transforms vectors from mean J2000.0 to mean of
///     date by applying precession.
///
///  4) The matrix rbp transforms vectors from GCRS to mean of date by
///     applying frame bias then precession.  It is the product rp x rb.
///
///  5) It is permissible to re-use the same array in the returned
///     arguments.  The arrays are filled in the order given.
///
///  Called:
///     eraPfw06     bias-precession F-W angles, IAU 2006
///     eraFw2m      F-W angles to r-matrix
///     eraPmat06    PB matrix, IAU 2006
///     eraTr        transpose r-matrix
///     eraRxr       product of two r-matrices
///     eraCr        copy r-matrix
///
///  References:
///
///     Capitaine, N. & Wallace, P.T., 2006, Astron.Astrophys. 450, 855
///
///     Wallace, P.T. & Capitaine, N., 2006, Astron.Astrophys. 459, 981
///
///  This revision:  2021 May 11

pub fn bp06(date1: f64, date2: f64,
    rb: &mut[[f64; 3]; 3], rp: &mut[[f64; 3]; 3], rbp: &mut[[f64; 3]; 3])
{
    let mut gamb =0.0; let mut phib =0.0; let mut psib =0.0; let mut epsa =0.0;
    let mut rbpw = [[0.0; 3]; 3]; let mut rbt = [[0.0; 3]; 3];
 
 
 /* B matrix. */
    pfw06(URSA_DJM0, URSA_DJM00, &mut gamb, &mut phib, &mut psib, &mut epsa);
    fw2m(gamb, phib, psib, epsa, rb);
 
 /* PxB matrix (temporary). */
    pmat06(date1, date2, &mut rbpw);
 
 /* P matrix. */
    tr(rb, &mut rbt);
    rxr(&rbpw, &rbt, rp);
 
 /* PxB matrix. */
    cr(&rbpw, rbp);
 
 /* Finished. */
 
 }