From 70a98619887d3356279d5544a04e182c69802594 Mon Sep 17 00:00:00 2001 From: giaf Date: Fri, 29 Jul 2016 12:36:50 +0200 Subject: [PATCH] added sol09.txt --- exercises/ex09/solutions/sol09.txt | 78 ++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 exercises/ex09/solutions/sol09.txt diff --git a/exercises/ex09/solutions/sol09.txt b/exercises/ex09/solutions/sol09.txt new file mode 100644 index 0000000..acef504 --- /dev/null +++ b/exercises/ex09/solutions/sol09.txt @@ -0,0 +1,78 @@ +|------------------| +| Solution of ex09 | +|------------------| + + +--- +9.1 +--- + +CPLEX + +conv1i.mod: qp hessian is not positive-semidefinite + +conv2i.mod: qp hessian is not positive-semidefinite + +linearize constraint: +conv3i.mod: solution (-2,3) +it is already using the option rqconvex=3 (global solution) + +conv4i.mod: identical to conv3i.mod + + + +--- +9.2 +--- + +Gurobi + +conv5i.mod: Gurobi hangs, it makes millions of iterations and when stopped it returns (-2,-2) +BUG ??? + + + +--- +9.3 +--- + +Xpress + +conv6i.mod: it works fine, returninig the solution (-2,3) + + + +--- +9.4 +--- + +SCIP + +conv7i.mod: it works fine, returning the solution (-2,3) + +original quadratic constraint +conv8i.mod: it works fine, returning the solution (0,1) + +non-convex constraint +conv9i.mod: it works fine, returning the solution (0,1) + + + +--- +9.5 +--- + +See boiler.mod. +The problem is not-convex (try to plot the objective) + + + + +--- +9.6 +--- + +See boiler_int1.mod and boiler_int2.mod +KNITRO without multistart will return a local solution for the boiler_int2.mod +KNITRO with multistart finds the global solution (same as Couenne) + -- 2.22.2