如何在OPL CPLEX中找到约束松弛

Question

i ve mip模型，我想知道哪些约束是活动的。

谢谢

Answer 1

让我给你一个小例子：

dvar float+ Gas;
dvar float+ Chloride;

maximize
  40 * Gas + 50 * Chloride;
subject to {
 ctMaxTotal:     
Gas + Chloride <= 50;
  ctMaxTotal2:    
3 * Gas + 4 * Chloride <= 180;
  ctMaxChloride:  
Chloride <= 40;
}
float slackCtMaxTotal=slack(ctMaxTotal);
float slackCtMaxTotal2=slack(ctMaxTotal2);
float slackCtMaxChloride=slack(ctMaxChloride);
execute
{
writeln("slack1= ",slackCtMaxTotal);
writeln("slack2= ",slackCtMaxTotal2);
writeln("slack3= ",slackCtMaxChloride);
}