Is there any interaction between presolve and restarting with the dual?
I set the presolve on before the first call to the simplex method.
The presolver must be disabled before re-optimization. If it is
enabled, the current basis is ignored that makes re-optimizaton
impossible.
I appreciate your quick reply. I think it works now, but would like to
make sure.
The initial LP takes about 40 minutes to solve, so trying out different
ideas is a bit slow.
I now explicitly turn off the presolver before the second call to the
simplex. My pseudo code looks like:
