Originally posted by: baatezu

Hello, everyone!

I have the following question:
let's assume a have some LP problem and I have several constraints of type:
x1 = 1 and x2 > 0 or
x1 = 0 and x2 = 0

To include such constraint in .net one can simply use IfThen constraints.

Is there any way to incapsulate such constraint in Matlab?
Or, rephrasing the question: is there any analogue for ifThen if you use Matlab interface?

Thanks in advance.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: John Cui

You can use "cplex.addIndicators" method to add logic constraints in MATLAB.

addpath('/opt/CPLEX_Studio/cplex/matlab');
cplex=Cplex();
cplex.addCols([1;2]);
cplex.Model.ctype = 'BB';
cplex.addIndicators(1,1,[0,1]','E',0);
cplex.addIndicators(1,0,[0,1]','E',0);
cplex.writeModel('test.lp') ;

The matlab code with addIndicators:

\ENCODING=ISO-8859-1
\Problem name: CPLEX

Minimize
 obj: x1 + 2 x2
Subject To
 i1: x1 = 0 -> x2  = 0
 i2: x1 = 1 -> x2  = 0
Bounds
 0 <= x1 <= Inf
 0 <= x2 <= Inf
Binaries
 x1  x2
End

John Cui

#CPLEXOptimizers
#DecisionOptimization

Originally posted by: baatezu

Thanks!
#CPLEXOptimizers
#DecisionOptimization