Originally posted by: savant_ning

I use cplex in python, and I want to add a Multidimensional arrays as variable; how can I do it?

and the lb, ub, objective and the types how to add?

Hi,

have you had a look at foodmanu.py in

CPLEX_Studio1271\cplex\examples\src\python

?

regards

Originally posted by: savant_ning

yeah, thanks a lot

I have learn about this code, and I have a question:

if I need to multiple three variables, including two variables(both  binary) added in variables.add,  one is the constant number;

How to write this linear_constraints.add function?

like this:

y = a * b *c

a,b is variables and c is constant number.

The product of two variables is not a linear term. Hence this is is not a linear constraint and you cannot use the linear_constraints interface to add constraints of this type. You have to use the quadratic_constraints interface instead.

You may have a look at the example qcpex1.py

in

CPLEX_Studio128\python

regards

The product of a binary variable and another binary variable (or a binary variable and any bounded variable) can be linearized: https://orinanobworld.blogspot.com/2010/10/binary-variables-and-quadratic-terms.html.