Originally posted by: naoseinao

Hi there,

I am struggeling trying to use indices refering to previous ones for a decision variable.

The following code does not work:

range i= 1..10;
range j= i..10;
dvar boolean x[i][j];

Thank you for your time.

Regards

Hi,

in a multi dimension array you have the full Euclidian product of dimensions but you could use tuple set instead:

range i= 1..10;
range j= 1..10;

tuple ij
{
int i;
int j;
}

{ij} ijs={<ii,jj> | ii in i,jj in j: jj>=ii};
dvar boolean x[ijs];

subject to
{
x[<1,2>]==1;

}

regards

https://www.linkedin.com/pulse/making-decision-optimization-simple-alex-fleischer/