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/* btfint.h (interface to BT-factorization) */
/***********************************************************************
* This code is part of GLPK (GNU Linear Programming Kit).
* Copyright (C) 2013-2014 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 BTFINT_H
#define BTFINT_H
#include "btf.h"
#include "sgf.h"
typedef struct BTFINT BTFINT;
struct BTFINT
{ /* interface to BT-factorization */
int n_max;
/* maximal value of n (increased automatically) */
int valid;
/* factorization is valid only if this flag is set */
SVA *sva;
/* sparse vector area (SVA) */
BTF *btf;
/* sparse block triangular LU-factorization */
SGF *sgf;
/* sparse Gaussian factorizer workspace */
/*--------------------------------------------------------------*/
/* control parameters */
int sva_n_max, sva_size;
/* parameters passed to sva_create_area */
int delta_n0, delta_n;
/* if n_max = 0, set n_max = n + delta_n0
* if n_max < n, set n_max = n + delta_n */
double sgf_piv_tol;
int sgf_piv_lim;
int sgf_suhl;
double sgf_eps_tol;
/* factorizer control parameters */
};
#define btfint_create _glp_btfint_create
BTFINT *btfint_create(void);
/* create interface to BT-factorization */
#define btfint_factorize _glp_btfint_factorize
int btfint_factorize(BTFINT *fi, int n, int (*col)(void *info, int j,
int ind[], double val[]), void *info);
/* compute BT-factorization of specified matrix A */
#define btfint_delete _glp_btfint_delete
void btfint_delete(BTFINT *fi);
/* delete interface to BT-factorization */
#endif
/* eof */
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