Dear all, I would like to use glpk in order to obtain exact rational solutions of linear programming problems (all variables rationals, no integer).
Unfortunately, since GLPK is not thread safe, I have to use the glpsol as an external program called from a C++ program. When I use the option --exact and --xcheck I get unfortunately a vertex with fractional coordinates expressed as 1.666667 instead of the expected 5/3. I know I can compute the exact solution since I have a basis of incident inequalities. But it is a little bit sad to have to recompute something which is likely available from the model itself. Also, the documentation glpk.pdf gives the following for using the model. It says that it is better to first use glp_simplex and then use glp_exact in order to achieve good result. Reading the source code, it seems that this is achieved by using --xcheck (but not --exact) for solving the problem. Mathieu
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