CPLEX 求解过程详解，精简版

原文链接： https://blog.csdn.net/mucai1/article/details/12314681

/* Bring in the CPLEX function declarations and the C library
header file stdio.h with the include of cplex.h. */

#include

/* Bring in the declarations for the string functions */

#include
#include

setproblemdata (char *probname_p, int *numcols_p, int *numrows_p,int *objsen_p, double *obj_p, double *rhs_p,
char *sense_p, int *matbeg_p, int *matcnt_p,int *matind_p, double *matval_p,
double *lb_p, double *ub_p, char *ctype_p
);

void main()
{
/* Declare pointers for the variables and arrays that will contain
the data which define the LP problem. The setproblemdata() routine
allocates space for the problem data. */
//定义变量
char *probname = NULL;
int numcols;
int numrows;
int objsen;
double *obj = NULL;
double *rhs = NULL;
char *sense = NULL;
int *matbeg = NULL;
int *matcnt = NULL;
int *matind = NULL;
double *matval = NULL;
double *lb = NULL;
double *ub = NULL;
char *ctype = NULL;

CPXENVptr env = NULL;
CPXLPptr lp = NULL;
int status;
int i, j;
int cur_numrows;
int cur_numcols;

//初始化环境变量
env = CPXopenCPLEX(&status);
//显示信息到屏幕上面
status = CPXsetintparam(env,CPX_PARAM,CPX_ON);
//调用数据设置函数，构造问题
setproblemdata(&probname, &numcols, &numrows, &objsen, &obj,
&rhs, &sense, &matbeg, &matcnt, &matind, &matval,
&lb, &ub, &ctype);
//创建问题对象
lp = CPXcreateprob(env,&status,probname);
//复制相关数值
status = CPXcopylp (env, lp, numcols, numrows, objsen, obj, rhs,
sense, matbeg, matcnt, matind, matval,
lb, ub, NULL);
//复制变量类型
status = CPXcopyctype (env, lp, ctype);

/////////////////////////////////////////////////////////////////////////
//求解问题
status = CPXmipopt (env, lp);
//获取结果
solstat = CPXgetstat (env, lp);
//目标函数
status = CPXgetobjval (env, lp, &objval);
//x的值
status = CPXgetx (env, lp, x, 0, cur_numcols-1);
}