Originally posted by: EhSa

Hi,

I am using CPLEX optimization toolbox for Matlab. I run the command cplexbilp to solve a BIP model

cplexbilp(f, Aineq, Bineq, Aeq, beq, X0, options);

I would like to start with the binary feasible solution x0. Now even though x0 is feasible, it seems that CPLEX ignores it and starts with a different solution found during the preprocessing phase with a worse objective value. I thought this can be due to CPLEX preprocessing, so I used cplexoptimset to turn the preprocessing off using the following commands

options = cplexoptimset('cplex');
options.preprocessing.presolve = 0;

Now as a result of doing so I cannot see any progress report on the screen and cannot really tell what is happening anymore. So my questions are:

1) If ignoring the initial solution x0 is indeed caused by the presolve or not?
2) What additional parameter in 'options' needs to be adjusted to see the progress report on the screen?

Thanks!
Ehsan
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: John Cui

Could you please send out your matlab code to the forum? then I can give a try.

John Cui
#CPLEXOptimizers
#DecisionOptimization