Forum Discussion
Combining sum and overall statement
Hi, I am trying to build a perishable supply chain model. To include perishability, I want to include a constraint in which for every period in time (T is the set of periods, indexed by t) the model...
Hi Stijn,
if you define your constraint for all t in Theta..NT, then "t" is already defined and can't be reused as a summation index. Naming those other summation indices tau should be fine, but then you should also sum over x(tau,i) [and similarly for the other two], if you want to compute the sum of all productions in previous periods, currently you would just add the production of the current period once for each previous period.