Hi Andrew, Please replace file glpk-4.63/src/simplex/spydual.c with a new one > (see attachment) and then build the package as usual. >
I did some testing with this version of dual simplex: I tried several problems from miplib 2010, including some that had trouble with the previous version and it seems to be a big improvement. The only issue I run into was with primal simplex, similar to the case that was reported earlier [1]. Best Regards, Chris Matrakidis [1] https://lists.gnu.org/archive/html/help-glpk/2017-08/msg00000.html
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