Originally posted by: RaguNasu

In a C++ application, I want change my type of var. How can I do.

example:

/*
IloNumVarArray edge(env,38, 0, 1, ILOFLOAT);

edge10(env, 0, 1, ILOBOOL);

IloNumVarArray edge(env,38, 0, 1, ILOFLOAT); //RESET
*/
This is a error example.
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Originally posted by: SystemAdmin

In order to change the type of a variable you have to use class IloConversion. The reference manual has examples about how to change the type of a variable.
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Originally posted by: RaguNasu

Thanks your answer.
But I still have some problem.

I can add Constraint frome ILOFLOAT to ILOINT.

"model.add(IloConversion(env, edge [j], ILOINT));"

But I can't add Constraint frome ILOINT to ILOFLOAT.

"model.add(IloConversion(env, edge, ILOFLOAT)); //RESET"

P.S.
"IloNumVarArray edge(env, N*(N-1)/2, 0, 1, ILOFLOAT);"
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Originally posted by: SystemAdmin

What problems do you observe? Compiler, linker, runtime problems?

Is it just a typo or did you leave out the index j in the second conversion intentionally?
Your second conversion should read

model.add(IloConversion(env, edge[j], ILOFLOAT)); // RESET

Note the j index. There is no IloConversion constructor that accepts arrays as second argument.

I guess you got an IloCplex::MultipleConversionException? Look at the reference manual.
It explicitly states that there can be only one IloConversion for each variable.

To remove a conversion from a model you should end() that conversion (this is also
explained in the reference manual):

// Add the conversion.
IloConversion conversion(env, edge [j], ILOINT);
model.add(conversion);
 
// Remove the conversion.
conversion.end();

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