You generally do this by adding a binary variable (and, of course, this
becomes an integer program rather than a simple linear program, and
therefore more difficult to solve).
For example:
var z, binary;
s.t. condition{f in FOO, b in BAR}: sum{a in BAZ} x[f,b,a] >= 5 * z;
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of JohannesJ
Sent: Saturday, March 22, 2008 10:46 AM
To: [email protected]
Subject: [Help-glpk] "0 or greater than" condition
Hi all,
I want to use the following kind of condition in GLPK:
s.t. condition{f in FOO, b in BAR}: sum{a in BAZ} x[f,b,a] "is
either 0 or
greater than 5"
Is this possible at all? If yes, do you have any hints on how I can do
this
in MathProg? I tried it, but couldn't figure it out.
Thanks in advance,
Johannes
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