The XPRESS Solver Options dialog General tab allows you to select the algorithm or solution method -- primal Simplex, dual Simplex, or Newton Barrier -- and to optionally invoke a presolve step which often simplifies the problem.
The Scaling group of options allows you to select from a variety of scaling methods to improve numerical accuracy. You can also set a maximum solution time in seconds, and adjust the most common tolerancesfor the Simplex method from this tab.
