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/* spxat.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 SPXAT_H
#define SPXAT_H
#include "spxlp.h"
typedef struct SPXAT SPXAT;
struct SPXAT
{ /* mxn-matrix A of constraint coefficients in sparse row-wise
* format */
int *ptr; /* int ptr[1+m+1]; */
/* 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;
* ptr[m+1] indicates the position after the last element in
* arrays ind and val, i.e. ptr[m+1] = nnz+1, where nnz is the
* number of non-zero elements in matrix A;
* the length of i-th row (the number of non-zero elements in
* that row) can be calculated as ptr[i+1] - ptr[i] */
int *ind; /* int ind[1+nnz]; */
/* column indices */
double *val; /* double val[1+nnz]; */
/* non-zero element values */
double *work; /* double work[1+n]; */
/* working array */
};
#define spx_alloc_at _glp_spx_alloc_at
void spx_alloc_at(SPXLP *lp, SPXAT *at);
/* allocate constraint matrix in sparse row-wise format */
#define spx_build_at _glp_spx_build_at
void spx_build_at(SPXLP *lp, SPXAT *at);
/* build constraint matrix in sparse row-wise format */
#define spx_at_prod _glp_spx_at_prod
void spx_at_prod(SPXLP *lp, SPXAT *at, double y[/*1+n*/], double s,
const double x[/*1+m*/]);
/* compute product y := y + s * A'* x */
#define spx_nt_prod1 _glp_spx_nt_prod1
void spx_nt_prod1(SPXLP *lp, SPXAT *at, double y[/*1+n-m*/], int ign,
double s, const double x[/*1+m*/]);
/* compute product y := y + s * N'* x */
#define spx_eval_trow1 _glp_spx_eval_trow1
void spx_eval_trow1(SPXLP *lp, SPXAT *at, const double rho[/*1+m*/],
double trow[/*1+n-m*/]);
/* compute i-th row of simplex table */
#define spx_free_at _glp_spx_free_at
void spx_free_at(SPXLP *lp, SPXAT *at);
/* deallocate constraint matrix in sparse row-wise format */
#endif
/* eof */
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