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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