|Subject:||RE: [Help-glpk] OPB output file anomaly|
|Date:||Fri, 29 Feb 2008 11:58:32 -0800|
Thanks for the quick response Oscar.
> It is assumed that the coefficients are integers.
All coeff's and b's are integer in my model.
> But, from your explanation it seems like all the coefficients are zero,
> which is strange. Especially since you get an incorrect result when
> removing the empty constraints. (Clearly it would be good to check if
> there are any non-zero coefficients.)
Not too sure by what you mean by "check if there are any non-zero coeff". If there were non-zero coeffs then we'd be talking about an error in glp_get_mat_row(), right?
> One possible reason is that your model generates some dummy constraints
> that breaks the model and that you also have fractional coefficients that
> are not well handled by the export function leading to an incorrect
Everything is integer in the model. I could see in the export function (lpx_write_pb()) where the coeff values are cast to ints, is this what you mean by 'not well handled'? I can understand that, but the fact that I never get to that fprintf statement at all because k==0 seems like the issue here. Any other thoughts about what I should inspect?
Oh, and thanks for writing this module in the first place, it should turn out to be handy for me,
Connect and share in new ways with Windows Live. Get it now!
|[Prev in Thread]||Current Thread||[Next in Thread]|