Hello,
I am using the standalone glpsol solver to solve a MIP. I had been using it
with the "--cuts" option, but noticed a strange problem. My model includes
a binary variable indexed over a large set. Like this:
set CurCoverage dimen 2;
.
.
.
var kcoversi {(k,i) in CurCoverage} >=0, <= 1;
var inuse {c in Combinations} binary;
and a constraint where kcoversi >= inuse -- which should force koversi to
take on values of only 0 or 1 without being declared binary.
After I solve the model, I want to see which values of kcoversi are = 1, so
I have an output statement like this:
printf{(k,i) in CurCoverage: kcoversi[k,i] >0}: "%f, %f, %f\n", k, i,
kcoversi[k,i];
when I solve without the "--cuts" option, everything works fine. When I
solve with the "--cuts" option, I get the same result for the objective, but
when I use the printf command to display for which values of CurCoverage is
kcoversi=1 (as above), it is missing a small number of tuples. If I just
display all values of kcoversi, the correct results are displayed.
Any ideas?
thanks,
Greg
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