I have a couple of initial questions based on skimming the GLPK Reference Manual and examples.
The manual says set_glb_obj_coef applies to structural variables. How are auxiliary (aka slack, row) variable costs set? Are free variables implemented as the difference of two non-negative variables? Is it possible to set the costs (objective coefficients) of the two to have the same sign so that the absolute value of a free variable can be maximized/minimized? Has anyone benchmarked GLPK against the netlib LP suite, http://www.netlib.org/lp/ http://www.netlib.org/lp/)? Are there any reports of how it has fared with those? (The objective values obtained by rational solution have been published.) Thanks.
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