Objects of type ILinearNumExpr represent linear expressions of the form

sum_{i=1..n} a_i * x_i + c

where x_i are variables of type INumVar and c and a_i are double values.

ILinearNumExpr objects are created with methods:

• IModeler.LinearNumExpr()
• IModeler.ScalProd()

Once created, integer linear expressions can be fully edited:

• new terms a_i * x_i can be added;
• coefficients of existing terms can be modified;
• existing terms can be removed;
• the constant can be reset.

All the information stored in a ILinearNumExpr object can be queried as well. The constant term is accessed via method getConstant(). The values and variables of the terms a_i * x_i are accessed using enumerator objects of type ILinearNumExpr.Enumerator that can be created using method GetLinearEnumerator().