-------- Forwarded Message --------
From: Thomas Schwabhäuser <[email protected]>
To: [email protected]
Subject: How can regions be modeled in which different objective
functions apply?
Date: Thu, 28 Sep 2017 11:02:48 +0200
Dear All --
I need to find the maximum energy which is given by 4 GMPL expressions
F[x,y], G[x,y], H[x,y], K[x,y], say. These expressions apply to
different regions determined by thresholds S and T. According to Re:
[Help-glpk] Multiple LP problem solving I was going to solve the
following Problem:
maximize Energy: ObjF;
subject to Region1: x >= S or y >= T or ObjF <= F[x,y] ;
subject to Region2: x <= S or y >= T or ObjF <= G[x,y];
subject to Region3: x >= S or y <= T or ObjF <= H[x,y];
subject to Region4: x <= S or y <= T or ObjF <= K[x,y];
Unfortunately the Messages when parsing this are
Reading model section from models\RLMF.mod...
models\Regions.mod:79: syntax error in constraint statement
Context: ...ize Energy : Z ; subject to Region1 : XM >= Thresh_M or
1. Can somebody explain this error?
2. I suspect a logical or is not allowed in constraints. Is that
true?
3. If so, could anybody propose an alternative?
Thanks, Thomas
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