Hello everyone,
I have a very long objective function which I divided into 2 parts. Can we write an expression like following in CPLEX?
dexpr float cost1 = sum in (.....) exp1;
dexpr float cost2 = sum in (.....) exp2;
dexpr float cost3 = cost1 + cost;
In addition, I get the following error: "Cannot use type float for userFunction" How should I interpret this error?
Thank you in advance!
Hello,
addition of the expressions should be certainly possible, but the exact syntax would depend on the language/interface that you are using.
I assume that you are using OPL. Then simple example like this should work (I create two separate expressions, the sum of which is then maximized):
dvar float x in 0..20;
dvar float y in 0..20;
dvar float z in 0..20;
dexpr float expr1=x+y;
dexpr float expr2=z;
maximize(expr1+expr2);
subject to
{
x==2.5*y;
z
hi,
dexpr float cost1 = sum in (.....) exp1;
dexpr float cost2 = sum in (.....) exp2;
dexpr float cost3 = cost1 + cost;
the error is here: dexpr float cost3 = cost1 + cost;
hi,
you can try this:
dvar float+ Cost1;
dvar float Cost2;
then
Minimize Cost1+Cost2
and then put the calculation expressions in the constraints
I hope this will help you.
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