Originally posted by: -3300-

Hey, 

I hope you can help me. I try to specify a decision variable. The variable should be zero or higher than 50.

I tried to to model this fact with the logical constraints. Like this:          a(i)(k)==0 || a(i)(i)>=50  But it doesn't work.

Therefore I need your help. Do you have another idea how I can model the fact?

Hi

dvar int a[1..2][1..2];
subject to
{
 forall(i,k in 1..2) a[i][k]==0 || a[i][i]>=50  ;
}

works fine

regards

https://www.linkedin.com/pulse/how-opl-alex-fleischer/

Originally posted by: -3300-

Hey Alex,

thank you for your help. The quantity limits works fine. But now the model doesn't work right. My model is a transportation problem and there are two requirements are not completely fulfills. 

My quantity limits are just for nine from fourteen sources. Therefore I model this like this. 

dvar    a[1..14][1..13]

subject {

     forall (i in 1..9, k in goods)

    a[i][k]==0 ||  a[i][k]>=50 ;

}

Perhaps do you have an other idea, how I can model my problem.

Hi

then you could write

range goods=1..13;
dvar int   a[1..14][goods] ;
subject to
{
 forall (i in 1..9, k in goods)

    a[i][k]==0 ||  a[i][k]>=50 ;
}

regards

Originally posted by: -3300-

Thank you