I'm trying to add a cardinality constraint to an existing model and I'm getting
stuck.
var w{S} ;
param inc{S}, binary;
where I want to set the binary variable:
if w[s] = 0 then inc[s] = 0 else inc[s] = 1
s.t. IsIncluded {s in S}: if w[s] > 0 then inc[s]=1;
/* a cardinality constraint -- only include 4 in the solution */
s.t. C6: sum {s in S} inc[s] = 4;
I must admit I'm a newbie at coding models with MathProg, so I think I'm
suffering from the syntax.
Basically, I would like to set the binary variable to 1 if w[s] > 0 and 0
otherwise.
Is this the proper use of the if-then-else statement?
Jeff Hamann
[email protected]
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