indexing - Q1 is not convex error while using decision variable in index

Question

In my model, first I calculate the number of ports in which ship drop the cargo

forall(i in 1..N,j in k+1..N)
z[i][j]==sum(z in k..N-1)z*dr[i][j][z];

Then I want to use this number as the index of "t",in the form of

t[z[i][j]]

I'm faced with

error:5002 q1 is not convex

How I can solve this problem?

score -1 · Accepted Answer

range r=1..5;

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

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

}

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

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