Originally posted by: GoheX

Indexing array "Assign" with type dexpr int not supported by this algorithm

Good evening,

My question is similar to one already asked on Stackoverflow, but there was not an answer (at least not one accepted nor suitable).

I am attempting to make a constraint, which I've simplified below:

dexpr int startingWeekChanges[p in People] = 7 * y + 1; 

...

for(p in People){
    Assign[startingWeekChanges[p]] == 1;
}

But I see this is not allowed (error message being "Indexing array "Assign" with type dexpr int not supported by this algorithm").

I can't change over to constraint programming. Is there an alternative strategy to get by this?

Hi,

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

How to use a decision variable as an index with CPLEX ?

could help.

If we want to use dexpr instead of dvar we can write

range r=1..5;

    float value[r]=[2,3,4.5,1,0];
    dvar int i in 1..5;
    dexpr int j=6-i;

    maximize sum(k in r) value[k]*(k==j);
    subject to
    {

    }

    execute
    {
    writeln("i=",i);
    }

regards

Your question is not only 'similar to one posted on StackOverflow', but is cross-posted on StackOverflow at https://stackoverflow.com/questions/55658666/cplex-indexing-array-assign-with-type-dexpr-int-not-supported-by-this-algorit.  If you really think you have to cross-post, please at least mention it. Thanks.

I posted an answer to your question on stackoverflow.