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Summation over index domain

  • 24 May 2023
  • 1 reply
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Hi, 

I am trying to model the following constraint:

with x as a nonnegative value indication the hours processed of job j-1 in time bucket t and Y as binary variable indicating that job j in time bucket t may start or not. The problem is that t is in the index domain and I need a summation over t’ based on t. 

How can I properly model this? I already have two indices for the set time buckets: t and h. But how do I model that x(i,j,t) is the same as x(i,j,h)? Preferably in one variable if that is possible? If I just simply say x(i,j,h) in the constraint I get the error: The parentheses in variable "x" do not match. Which is true since I modelled the variable as x(i,j,t). 

 

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Best answer by MZwanenburg 25 May 2023, 17:02

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Nevermind, it works like I thought it  would work. Did not get the error again, perhaps some notation mistakes.

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