Originally posted by: QINGQINGQING

dear all,

I am now using cplex on java to implement a model, and I would like to assign

t[i]+t[j]

to a certain variable

x

,
now I do not know how to handle it and ask for your help.

Thank you
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

Have you looked at the various examples that ship with CPLEX? I think reviewing the source code would help to answer some of your questions.

/Paul

Mathematicians are like Frenchmen: whenever you say something to them, they translate it into their own language, and at once it is something entirely different. (Goethe)
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: QINGQINGQING

how about assign

IloNumVar

t[i]*t[j]

to

x

?
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: QINGQINGQING

IloNumVar][[] x=new IloNumVar[D][D][K];//x_ijk is bool
double interval=Integer.MAX_VALUE+travelling_time+service_time
now I want to asign

-Integer.MAX_VALUE+x[i][j][k]*interval

to a certain variable, such as

var
then I want to add the constraint

t[i]+var<t[j]//t[i] and t[j] are both time

into the cplex model
Thank you
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

You can build up any kind of (linear) expression using functions cplex.sum(), cplex.prod(), cplex.diff(). Or just use addTerm() of IloLinearNumExpr.
Please also refer to chapter "ILOG Concert Technology for Java users" in the user manual. It should answer all the questions you are posting here.
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