Originally posted by: WillemUilhoorn

All,

I have  a question about defining a sequence from a range. For example:

I have a range for my items with 

range i = 1..n;

And have a binary decision variable (later used in constraints) 

dvar int xp[i][k];   //BIN 1 if item i is right of item k

which is about the relative placement of an item in a packing problem. The k however, indicates here the item k that comes after item i. So in fact, it is i+1 in the same range. How can I define this in CPLEX OPL?

Any ideas? Many thanks in advance

Hi,
small code to start with:

int n=4;
range i = 1..n;
range k=2..n+1;
dvar boolean xp[i][k];
subject to
{
forall(ii in i) forall(kk in 2..ii) xp[ii][kk]==0;
forall(ii in i) sum(kk in k) xp[ii][kk]==1;
}

regards