# Decision Optimization

View Only

## Define variable subject to decision variable binary

• #### 1.  Define variable subject to decision variable binary

Posted Fri August 30, 2019 08:36 AM

Originally posted by: JCGar

Hello,

I have a binary decision variable dvar boolean X , an integer variable dvar int  bu  and  dvar int+ zh;

X [<h,u,c>] = {<1 1 1> <1 1 2> <1 1 3> <1 1 4> <1 1 5> <1 2 1> <1 2 2>
<1 2 3> <1 2 4> <1 2 5> <1 3 1> <1 3 2> <1 3 3>
<1 3 4> <1 3 5> <1 4 1> <1 4 2> <1 4 3> <1 4 4>
<1 4 5> <1 5 1> <1 5 2> <1 5 3> <1 5 4> <1 5 5>

<2 1 1>}

I have a restriction like this:

subject to{

forall (h in 1..2, c in res[h] )
bu[<h,c>] >=  sum(u in res[h]) x[<h,u,c>] ) - 1 ;

forall (h in 1..2)

zh[h] >= maxl( c in res[h]) bu[<h,c>] ;

}

variable bu give me:   bu = [0 -1 -1 1 1 0];  that is correct.

But I I would like to know if it is possible to add the values in c, to get something like this:   bu = [0 -1 -2 -1 0 0 ]

Regards.

#DecisionOptimization
#MathematicalProgramming-General

• #### 2.  Re: Define variable subject to decision variable binary

Posted Fri August 30, 2019 08:53 AM

I am not sure what you mean. Do you just want to add bu and c? Have you tried using a dexpr for that?

#DecisionOptimization
#MathematicalProgramming-General

• #### 3.  Re: Define variable subject to decision variable binary

Posted Fri August 30, 2019 09:40 AM

Originally posted by: JCGar

Hello,

I want sum the value obtained in  bu[<h,c>], as :  bu[<h,c>] = (sum(u in res[h]) x[<h,u,c>] ) - 1 ) + bu[<h,c-1>] .

Regards.

#DecisionOptimization
#MathematicalProgramming-General

• #### 4.  Re: Define variable subject to decision variable binary

Posted Sat August 31, 2019 04:25 AM

Hi

range r=1..6;

int buval[r] = [0, -1, -1, 1, 1, 0];

dvar int bu[r];
dvar int busum[r];

subject to
{
forall(i in r) bu[i]==buval[i];

busum[1]==bu[1];
forall(i in r:i!=1) busum[i]==busum[i-1]+bu[i];

}

execute
{
writeln(busum);
}

gives

[0 -1 -2 -1 0 0]

could that help ?

regards

#DecisionOptimization
#MathematicalProgramming-General

• #### 5.  Re: Define variable subject to decision variable binary

Posted Sun September 01, 2019 05:43 AM

Originally posted by: JCGar

Hello,

Tahnk you, it runs fine.

regards.

#DecisionOptimization
#MathematicalProgramming-General