Originally posted by: Ujfaaz

Hi everyone,

I'm relatively new at OPL and Cplex. I'm trying to build my first Supply Chain model. I have a Boolean variable, which indicates if an activity/process is in a specific site or not.

dvar int open[Sites][Act] in 0..1;

I have 2 Sites and 5 different Activities. So this variable is for example:

[[1, 0, 1, 0, 0]
 [0, 1, 0, 1, 1]]

Now i want to model another Boolean variable, which shows me the last activity produces at each site. All activities before should also have a 1.

 for this example it should be:

[[1, 1, 1, 0, 0]
 [1, 1, 1, 1, 1]]

How can I model this second Boolean variable. Which constraint should I use?

Thanks for your help.

#DecisionOptimization
#OPLusingCPLEXOptimizer

Hi

range Sites=1..2;

range Acts=1..5;

 

int opendata[Sites][Acts]=

[[1,0, 1, 0 ,0],[0, 1, 0, 1, 1]];

 

dvar boolean open[Sites][Acts];

dvar boolean x[Sites][Acts];

 

subject to

{

forall(i in Sites,j in Acts) open[i][j]==opendata[i][j];

 

forall(i in Sites,j in Acts) open[i][j]<=x[i][j];

 

forall(i in Sites,j in Acts:j!=1) x[i][j]-x[i][j-1]<= open[i][j-1];

 

}

 

execute

{

writeln(open);

 

writeln(x);

}

regards

#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: Ujfaaz

Many Thanks! It works excellent.

#DecisionOptimization
#OPLusingCPLEXOptimizer