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+/* btfint.h (interface to BT-factorization) */
+
+/***********************************************************************
+* This code is part of GLPK (GNU Linear Programming Kit).
+*
+* Copyright (C) 2013-2014 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 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 */