Originally posted by: academician1

In my model there are cont variables such as x,

and there are bin variables A.

A is defined as; if x>=0 A=1

otherwise A=0.

But in the model OPL assigns to a very small value, as x=0.00001, then A=1.

How can I prevent this situation.

Originally posted by: StephenHall

you have to increase the "integrability Tolerance" option.

In the IDE, File/New/Setting

If you want change the display of a number

in Language/General change Display Precision

http://pic.dhe.ibm.com/infocenter/cosinfoc/v12r6/topic/ilog.odms.ide.help/OPL_Studio/oplparams/topics/opl_params_langoptions_desc.html

in Mixed integer Programming/Tolerances change Integrality Tolerence

http://pic.dhe.ibm.com/infocenter/cosinfoc/v12r6/topic/ilog.odms.cplex.help/CPLEX/Parameters/topics/EpInt.html

http://pic.dhe.ibm.com/infocenter/cosinfoc/v12r6/topic/ilog.odms.ide.help/OPL_Studio/oplparams/topics/opl_params_mpoptions_setting.html