/* glpbfd.h (LP basis factorization driver) */

/***********************************************************************
*  This code is part of GLPK (GNU Linear Programming Kit).
*
*  Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
*  2009, 2010 Andrew Makhorin, Department for Applied Informatics,
*  Moscow Aviation Institute, Moscow, Russia. All rights reserved.
*  E-mail: <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 GLPBFD_H
#define GLPBFD_H

#ifndef GLPBFD_PRIVATE
typedef struct { double _opaque_bfd[100]; } BFD;
#endif

/* return codes: */
#define BFD_ESING    1  /* singular matrix */
#define BFD_ECOND    2  /* ill-conditioned matrix */
#define BFD_ECHECK   3  /* insufficient accuracy */
#define BFD_ELIMIT   4  /* update limit reached */
#define BFD_EROOM    5  /* SVA overflow */

#define bfd_create_it _glp_bfd_create_it
BFD *bfd_create_it(void);
/* create LP basis factorization */

#define bfd_set_parm _glp_bfd_set_parm
void bfd_set_parm(BFD *bfd, const void *parm);
/* change LP basis factorization control parameters */

#define bfd_factorize _glp_bfd_factorize
int bfd_factorize(BFD *bfd, int m, const int bh[], int (*col)
      (void *info, int j, int ind[], double val[]), void *info);
/* compute LP basis factorization */

#define bfd_ftran _glp_bfd_ftran
void bfd_ftran(BFD *bfd, double x[]);
/* perform forward transformation (solve system B*x = b) */

#define bfd_btran _glp_bfd_btran
void bfd_btran(BFD *bfd, double x[]);
/* perform backward transformation (solve system B'*x = b) */

#define bfd_update_it _glp_bfd_update_it
int bfd_update_it(BFD *bfd, int j, int bh, int len, const int ind[],
      const double val[]);
/* update LP basis factorization */

#define bfd_get_count _glp_bfd_get_count
int bfd_get_count(BFD *bfd);
/* determine factorization update count */

#define bfd_delete_it _glp_bfd_delete_it
void bfd_delete_it(BFD *bfd);
/* delete LP basis factorization */

#endif

/* eof */
