> I'm having a problem with using glpsol to solve an MIP problem using the > default tolerances. Using the MIP variant of my problem glpsol find an > integral optimal solution; however when I take that solution and solve > the problem again with the integer variables converted to parameters the > solution is vastly different. I have had this issue before with > commercial solvers and have solved it by tightening the integrality > tolerance to 0. Unfortunately I cannot determine a way to do this with > glpsol. Any assistance would be appreciated. >
You need to change the control parameter iocp.tol_int. You cannot do it from the command-line, however, you may patch the glpsol source code. Take file glpk/src/glpapi21.c, find the call to glp_inopt, and add a line above it as follows: csa->iocp.tol_int = 1e-20; glp_intopt(csa->prob, &csa->iocp); Note that tol_int should be positive, i.e. zero is not allowed. _______________________________________________ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk
