Originally posted by: anahana

Hi all,

I created a variable using IloNumVar and want to use it in a cos function. Something like this:

IloNumVar IloNumVar y1(env, -5.12, 5.12, "y1");
IloObjective obj = IloMinimize(env, (IloPower(y1,2) - 10*cos(2*IloPi*y1*IloPi/180) + 10));

However, when compiling the program I get this error message:

error C2665: 'cos' : none of the 3 overloads could convert all the argument types

I know the cos function expects a float or a long double as arguments, but can't I use IloNumVar with the cos function?

Regards,
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Originally posted by: ChrisBr

Dear anahana,

Please try to use "IloCos" instead of "cos" if you need to pass a IloNumVar as argument.

public IloNumExprArg IloCos(

const IloNumExprArg arg)

I hope this helps,

Chris.
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Originally posted by: anahana

Dear Chris,

Thanks for the tip!! It's working just fine. I didn't realize there were trigonometric functions in concert technology. By the way, the IloCos (or any of the other trigonometric functions) does not show up on the Index help documentation, only on the Search tab.

Regards,
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Originally posted by: rdumeur

Dear anahana,

It is indeed a documentation bug that we are, thanks to you, now aware of.

Cheers,

Renaud
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