topic The OPTMODEL Procedure in Mathematical Optimization, Discrete-Event Simulation, and OR

The OPTMODEL Procedure

ericvalos — Fri, 21 Sep 2018 19:15:45 GMT

http://support.sas.com/documentation/cdl/en/ormpug/66851/HTML/default/viewer.htm#ormpug_optmodel_gettingstarted03.htm

proc optmodel; /* specify parameters */ set O={'Detroit','Pittsburgh'}; set D={'Boston','New York'}; number c{O,D}=[30 20 40 10]; number a{O}=[200 100]; number b{D}=[150 150]; /* model description */ var x{O,D} >= 0; min total_cost = sum{i in O, j in D}c[i,j]*x[i,j]; constraint supply{i in O}: sum{j in D}x[i,j]=a[i]; constraint demand{j in D}: sum{i in O}x[i,j]=b[j]; /* solve and output */ solve; print x;

I dont understand assignments c{O, D}. my idea is assign a data step of two columns to this variable.

Re: The OPTMODEL Procedure

mkeintz — Fri, 21 Sep 2018 19:43:24 GMT

c{O,D} appears to be a cost matrix showing the costs from each of the two origins to each of the two destinations.

x{O,D} looks like it will be the optimal number of items to ship from each O to each D, subject to the various specified constraints.

And here endeth my understanding of proc optmodel.

But (edited addition): what data set do you want? Input data for proc optmodel, or output results? I imagine proc optmodel has a number of syntax options that include specifying data sets for problem parameters or optimization results.

In the problem you presented, which I ran, it looks like it makes no sense to send any of the Pittsburgh supply to Boston.