Commit 70a98619 authored by Gianluca Frison's avatar Gianluca Frison

added sol09.txt

parent 073adeb8
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| Solution of ex09 |
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9.1
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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
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9.2
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Gurobi
conv5i.mod: Gurobi hangs, it makes millions of iterations and when stopped it returns (-2,-2)
BUG ???
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9.3
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Xpress
conv6i.mod: it works fine, returninig the solution (-2,3)
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9.4
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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)
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9.5
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See boiler.mod.
The problem is not-convex (try to plot the objective)
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9.6
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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)
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