lufact 0.1.0

Sparse LU factorization with partial pivoting
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
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128

use crate::lu::*;
use crate::lufact::{lsolve, ltsolve, usolve, utsolve};

pub fn dgstrs(
    _gp: &GP,
    trans: char,
    n: i32,
    nrhs: i32,
    lu: &mut LU,
    ia: i32,
    ja: i32,
    b: &mut [f64],
    ib: i32,
    jb: i32,
    // desc_b: &CSC,
) -> i32 {
    // scalar_t*    rwork  = NULL;

    // int b_desc_type, b_ld;

    // statistics_reporter_t reporter_func;
    // void*                 reporter_ctxt;

    // let mut flops = 0.0;

    // (*info) = 0;

    /* extract data from gp object */

    // if ((gp) == NULL) {
    //   (*info) = -1;
    //   goto free_and_exit;
    // }

    // gp_get_statistics_reporter_c ((gp),&reporter_func, &reporter_ctxt);

    if ia != 1 {
        return -5;
    }
    if ja != 1 {
        return -6;
    }
    if ib != 1 {
        return -8;
    }
    if jb != 1 {
        return -9;
    }

    if nrhs != 1 {
        return -3;
    }

    /* we do not need this now since we assume a single dense rhs */
    /*
    b_desc_type = desc_b[0];
    if (b_desc_type != DESC_TYPE_DENSE) { (*info) = -10; goto free_and_exit; }
    b_ld = desc_b[1];
    */

    // if ((rwork  =
    //        (scalar_t*) malloc( n * sizeof(scalar_t) )) == NULL)
    //   { (*info) = -999; goto free_and_exit; }
    let mut rwork = vec![0.0; n as usize];

    if trans.to_ascii_uppercase() == 'N' {
        let _info = lsolve(
            n,
            &lu.lu_nz,
            &lu.lu_rowind,
            &lu.l_colptr,
            &lu.u_colptr,
            &lu.row_perm,
            &lu.col_perm,
            b,
            &mut rwork,
        );

        let _info = usolve(
            n,
            &lu.lu_nz,
            &lu.lu_rowind,
            &lu.l_colptr,
            &lu.u_colptr,
            &lu.row_perm,
            &lu.col_perm,
            &rwork,
            b,
        );
    } else if trans.to_ascii_uppercase() == 'T' {
        let _info = utsolve(
            n,
            &lu.lu_nz,
            &lu.lu_rowind,
            &lu.l_colptr,
            &lu.u_colptr,
            &lu.row_perm,
            &lu.col_perm,
            b,
            &mut rwork,
        );

        let _info = ltsolve(
            n,
            &lu.lu_nz,
            &lu.lu_rowind,
            &lu.l_colptr,
            &lu.u_colptr,
            &lu.row_perm,
            &lu.col_perm,
            &rwork,
            b,
        );
    } else {
        return -1;
    }

    let flops = (2 * (lu.u_colptr[n as usize] - 1)) as f64;

    // free_and_exit:
    //   if (rwork)  free(rwork);

    // if (reporter_func)
    //   (*reporter_func)(reporter_ctxt,"FLOPS",&flops);
    println!("FLOPS: {}", flops);

    0
}