Module: ppl/ppl Branch: pip Commit: 80b7e08459297f6dc193ad8988e49baa21e27df4 URL: http://www.cs.unipr.it/git/gitweb.cgi?p=ppl/ppl.git;a=commit;h=80b7e08459297...

Author: François Galea francois.galea@uvsq.fr Date: Fri Sep 18 09:21:54 2009 +0200

Finished parametric simplex algorithm. No cut generation yet.

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src/PIP_Tree.cc | 30 +++++++++++++++++++++++++++++- 1 files changed, 29 insertions(+), 1 deletions(-)

diff --git a/src/PIP_Tree.cc b/src/PIP_Tree.cc index 604683c..abdb0d5 100644 --- a/src/PIP_Tree.cc +++ b/src/PIP_Tree.cc @@ -871,8 +871,36 @@ PIP_Solution_Node::solve(PIP_Tree_Node*& parent_ref, return OPTIMIZED_PIP_PROBLEM; } } - //FIXME: to be finished

+ /* Otherwise, all parameters are positive: we have found a continuous + * solution. If the solution happens to be integer, then it is a + * solution of the integer problem. Otherwise, we may need to generate + * a new cut to try and get back into the integer case. */ + else { +#ifdef NOISY_PIP + std::cout << "All parameters are positive." + << std::endl; +#endif + tableau.s.normalize(); + tableau.t.normalize(); + + if (tableau.s.is_integer() && tableau.t.is_integer()) { + /* The solution is integer */ +#ifdef NOISY_PIP + std::cout << "Solution found for in current node." + << std::endl; +#endif + return OPTIMIZED_PIP_PROBLEM; + } + else { + /* The solution is non-integer. We have to generate a cut. */ + //FIXME: to be finished +#ifdef NOISY_PIP + std::cout << "Cut generation required." + << std::endl; +#endif + } + } } // Main loop of the simplex algorithm

return OPTIMIZED_PIP_PROBLEM;