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
|
/* spxnt.h */
/***********************************************************************
* This code is part of GLPK (GNU Linear Programming Kit).
* Copyright (C) 2015 Free Software Foundation, Inc.
* Written by Andrew Makhorin <mao@gnu.org>.
*
* GLPK is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GLPK is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
* License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GLPK. If not, see <http://www.gnu.org/licenses/>.
***********************************************************************/
#ifndef SPXNT_H
#define SPXNT_H
#include "spxlp.h"
typedef struct SPXNT SPXNT;
struct SPXNT
{ /* mx(n-m)-matrix N composed of non-basic columns of constraint
* matrix A, in sparse row-wise format */
int *ptr; /* int ptr[1+m]; */
/* ptr[0] is not used;
* ptr[i], 1 <= i <= m, is starting position of i-th row in
* arrays ind and val; note that ptr[1] is always 1;
* these starting positions are set up *once* as if they would
* correspond to rows of matrix A stored without gaps, i.e.
* ptr[i+1] - ptr[i] is the number of non-zeros in i-th (i < m)
* row of matrix A, and (nnz+1) - ptr[m] is the number of
* non-zero in m-th (last) row of matrix A, where nnz is the
* total number of non-zeros in matrix A */
int *len; /* int len[1+m]; */
/* len[0] is not used;
* len[i], 1 <= i <= m, is the number of non-zeros in i-th row
* of current matrix N */
int *ind; /* int ind[1+nnz]; */
/* column indices */
double *val; /* double val[1+nnz]; */
/* non-zero element values */
};
#define spx_alloc_nt _glp_spx_alloc_nt
void spx_alloc_nt(SPXLP *lp, SPXNT *nt);
/* allocate matrix N in sparse row-wise format */
#define spx_init_nt _glp_spx_init_nt
void spx_init_nt(SPXLP *lp, SPXNT *nt);
/* initialize row pointers for matrix N */
#define spx_nt_add_col _glp_spx_nt_add_col
void spx_nt_add_col(SPXLP *lp, SPXNT *nt, int j, int k);
/* add column N[j] = A[k] */
#define spx_build_nt _glp_spx_build_nt
void spx_build_nt(SPXLP *lp, SPXNT *nt);
/* build matrix N for current basis */
#define spx_nt_del_col _glp_spx_nt_del_col
void spx_nt_del_col(SPXLP *lp, SPXNT *nt, int j, int k);
/* remove column N[j] = A[k] from matrix N */
#define spx_update_nt _glp_spx_update_nt
void spx_update_nt(SPXLP *lp, SPXNT *nt, int p, int q);
/* update matrix N for adjacent basis */
#define spx_nt_prod _glp_spx_nt_prod
void spx_nt_prod(SPXLP *lp, SPXNT *nt, double y[/*1+n-m*/], int ign,
double s, const double x[/*1+m*/]);
/* compute product y := y + s * N'* x */
#if 1 /* 31/III-2016 */
#define spx_nt_prod_s _glp_spx_nt_prod_s
void spx_nt_prod_s(SPXLP *lp, SPXNT *nt, FVS *y, int ign, double s,
const FVS *x, double eps);
/* sparse version of spx_nt_prod */
#endif
#define spx_free_nt _glp_spx_free_nt
void spx_free_nt(SPXLP *lp, SPXNT *nt);
/* deallocate matrix N in sparse row-wise format */
#endif
/* eof */
|
