Originally posted by: huguowei

I am using C++ and CPLEX 12.1, under MS VS2008.
Runtime error.Concert exception caught:IloAlgorithm 00D09EA0 cannot change extractables.
what's the possible error in my program
many thanks!
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Originally posted by: SystemAdmin

Can you please provide more details? What is the code you are running? At which point does the exception occur (what is the function that throws the exception)?
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Originally posted by: huguowei

IloExprArray T(env);
{for(int i=0;i<100;i++)}
{model.add(IloRange(env,0,T[i],10);}
in fact,I build up an expression array,and every expression consists of some variable.
I want to add these expressions to constrains in my model in a loop.
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Originally posted by: SystemAdmin

Hm, this code works correctly for me:

// Create an array of expressions and a variable.
IloExprArray T(env);
IloNumVar x(env);
 
// Add 100 elements to the array.
for (int i = 0; i < 100; ++i)
   T.add(x);
 
// Create constraints.
for(int i=0;i<100;i++)
   model.add(IloRange(env,0,T[i],10);

How do you populate the array T? Maybe something is wrong with the way you to that?
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Originally posted by: huguowei

in the expression array T,some expression is like T[i]=IloPower(2.7,H),H is also a expression.H consisit of some variables,like H=x[0]+x[1];
Frankly,I don't know well about the use of cplex function, especially,when the input of the function is variable or expression.I thy some cplex functions.IloAbs(x), x can be a variable or expression.but IloPower() seem be not.
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Originally posted by: SystemAdmin

I guess your problem is IloPower. From the documentation of IloPower:

An instance of IloCplex can extract only quadratic terms that are positive semi-definite when they appear in an objective function or in constraints of a model.

So you cannot use IloPower in the way you do with CPLEX.
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