topic Re: Help with coding in Mathematical Optimization, Discrete-Event Simulation, and OR

Help with coding

Z_Lim — Tue, 29 Oct 2013 09:03:44 GMT

Hi,

I am trying to formulate this in SAS:

How should i code this?

Re: Help with coding

RobPratt — Tue, 29 Oct 2013 12:58:47 GMT

Your formula has a couple of issues, including overloading of t. I assume you meant the following (in LaTeX notation):

\sum_j j x_{ijt} = \sum_{s=\max(1,t-8)}^t y_{is} + \sum_{s=\max(1,t-16)}^t z_{is} + \sum_{s=\max(1,t-24)}^t w_{is} \forall i,t

If so, you can write this constraint in PROC OPTMODEL as follows:

con Mycon {i in ISET, t in TSET}:
sum {j in JSET} j * x[i,j,t] = sum {s in max(1,t-8)..t} y[i,s] + sum {s in max(1,t-16)..t} z[i,s] + sum {s in max(1,t-24)..t} w[i,s];

Re: Help with coding

Z_Lim — Wed, 30 Oct 2013 01:52:42 GMT

Hi Rob,

Thanks for your help. I will give it a try.