Module: ppl/ppl Branch: pip Commit: ff7e8d5afd59c8440045725bff0cac5e7644ab9c URL: http://www.cs.unipr.it/git/gitweb.cgi?p=ppl/ppl.git;a=commit;h=ff7e8d5afd59c...

Author: Enea Zaffanella zaffanella@cs.unipr.it Date: Mon Feb 1 19:23:18 2010 +0100

Minor improvements to PIP_Problem documentation and C interface.

---

interfaces/C/ppl_c_header.h | 22 ++++++++--- interfaces/C/ppl_c_implementation_common.cc | 14 ------- src/PIP_Problem.defs.hh | 3 +- src/PIP_Tree.cc | 12 +++---- src/PIP_Tree.defs.hh | 53 ++++++++++++++------------- 5 files changed, 50 insertions(+), 54 deletions(-)

diff --git a/interfaces/C/ppl_c_header.h b/interfaces/C/ppl_c_header.h index ac09559..f21626b 100644 --- a/interfaces/C/ppl_c_header.h +++ b/interfaces/C/ppl_c_header.h @@ -697,10 +697,20 @@ PPL_TYPE_DECLARATION(PIP_Problem)

/*! \interface ppl_PIP_Tree_Node_tag \brief - Types and functions for PIP tree nodes. + Types and functions for generic PIP tree nodes. */ PPL_TYPE_DECLARATION(PIP_Tree_Node) + +/*! \interface ppl_PIP_Decision_Node_tag + \brief + Types and functions for PIP decision nodes. +*/ PPL_TYPE_DECLARATION(PIP_Decision_Node) + +/*! \interface ppl_PIP_Solution_Node_tag + \brief + Types and functions for PIP solution nodes. +*/ PPL_TYPE_DECLARATION(PIP_Solution_Node)

/*! \interface ppl_Artificial_Parameter_tag @@ -2656,10 +2666,10 @@ PPL_PROTO((ppl_MIP_Problem_t mip, int value));

/*! \relates ppl_PIP_Problem_tag \brief Builds a trivial PIP problem of dimension \p d and writes an - handle to it at address \p pmip. + handle to it at address \p ppip. */ int -ppl_new_PIP_Problem_from_space_dimension PPL_PROTO((ppl_PIP_Problem_t* pmip, +ppl_new_PIP_Problem_from_space_dimension PPL_PROTO((ppl_PIP_Problem_t* ppip, ppl_dimension_type d));

/*! \relates ppl_PIP_Problem_tag \brief @@ -2744,7 +2754,7 @@ int ppl_PIP_Problem_clear PPL_PROTO((ppl_PIP_Problem_t pip));

/*! \relates ppl_PIP_Problem_tag \brief - Adds <CODE>m_pip_vars + m_pip_params</CODE> new space dimensions + Adds <CODE>pip_vars + pip_params</CODE> new space dimensions and embeds the PIP problem \p pip in the new vector space.

\param pip @@ -2966,8 +2976,8 @@ PPL_PROTO((ppl_const_PIP_Solution_Node_t pip_sol, ppl_const_Linear_Expression_t* le));

/*! \relates ppl_PIP_Tree_Node_tag \brief - Writes to \p pip_tree a const pointer to the \p b (true or false) branch - of \p pip_dec. + Writes to \p pip_tree a const pointer to either the true branch + (if \p b is not zero) or the false branch (if \p b is zero) of \p pip_dec. */ int ppl_PIP_Decision_Node_get_child_node diff --git a/interfaces/C/ppl_c_implementation_common.cc b/interfaces/C/ppl_c_implementation_common.cc index 27e8227..e297492 100644 --- a/interfaces/C/ppl_c_implementation_common.cc +++ b/interfaces/C/ppl_c_implementation_common.cc @@ -2342,13 +2342,6 @@ ppl_PIP_Tree_Node_get_constraints(ppl_const_PIP_Tree_Node_t pip_tree, CATCH_ALL

int -ppl_delete_PIP_Tree_Node(ppl_const_PIP_Tree_Node_t pip_tree) try { - delete to_const(pip_tree); - return 0; -} -CATCH_ALL - -int ppl_PIP_Tree_Node_OK(ppl_const_PIP_Tree_Node_t pip_tree) try { return to_const(pip_tree)->OK() ? 1 : 0; } @@ -2409,13 +2402,6 @@ ppl_PIP_Solution_Node_OK(ppl_const_PIP_Solution_Node_t pip_sol) try { CATCH_ALL

int -ppl_delete_PIP_Decision_Node(ppl_const_PIP_Decision_Node_t pip_dec) try { - delete to_const(pip_dec); - return 0; -} -CATCH_ALL - -int ppl_PIP_Decision_Node_OK(ppl_const_PIP_Decision_Node_t pip_dec) try { return to_const(pip_dec)->OK() ? 1 : 0; } diff --git a/src/PIP_Problem.defs.hh b/src/PIP_Problem.defs.hh index d9e52f1..f8a0f8a 100644 --- a/src/PIP_Problem.defs.hh +++ b/src/PIP_Problem.defs.hh @@ -449,8 +449,7 @@ public: //! Returns an optimizing solution for \p *this, if it exists. /*! \exception std::domain_error - Thrown if \p *this does not have an optimizing point, i.e., - if the PIP problem is unbounded or not satisfiable. + Thrown if the PIP problem is not satisfiable. */ PIP_Tree optimizing_solution() const;

diff --git a/src/PIP_Tree.cc b/src/PIP_Tree.cc index ce5e455..b454246 100644 --- a/src/PIP_Tree.cc +++ b/src/PIP_Tree.cc @@ -1045,6 +1045,7 @@ PIP_Solution_Node::ascii_load(std::istream& s) { return true; }

+// FIXME: this does not (yet) correspond to specification. const Linear_Expression& PIP_Solution_Node ::parametric_values(const Variable var, @@ -1062,13 +1063,10 @@ PIP_Solution_Node if (pos == all_parameters.end()) return solution[var.id()]; else { -#ifndef NDEBUG - if (*pos == var.id()) { - std::cerr << "PIP_Solution_Node::parametric_values(Variable): " - << "Supplied Variable corresponds to a parameter.\n"; - PPL_ASSERT(false); - } -#endif // #ifndef NDEBUG + if (*pos == var.id()) + throw std::invalid_argument("PIP_Solution_Node::" + "parametric_values(v, params): " + "variable v is a parameter."); const dimension_type dist = std::distance(all_parameters.begin(), pos); return solution[var.id() - dist]; } diff --git a/src/PIP_Tree.defs.hh b/src/PIP_Tree.defs.hh index b819b6e..9c9f412 100644 --- a/src/PIP_Tree.defs.hh +++ b/src/PIP_Tree.defs.hh @@ -260,10 +260,10 @@ public: parameters.

\param v - the variable which is queried about + The variable which is queried about.

\param parameters - a \c std::set of indices of the parameters in the problem constraints + A \c std::set of indices of the parameters in the problem constraints.

\exception std::invalid_argument Thrown if \p v is dimension-incompatible with \p *this @@ -406,15 +406,18 @@ private: */ std::vector<dimension_type> mapping;

- /*! \brief A vector of the variable identifiers associated to each row of - the simplex tableau. */ + /*! \brief + The variable identifiers associated to the rows of the simplex tableau. + */ std::vector<dimension_type> var_row;

- /*! \brief A vector of the variable identifiers associated to each column - of the simplex tableau. */ + /*! \brief + The variable identifiers associated to the columns of the simplex tableau. + */ std::vector<dimension_type> var_column;

- /*! \brief The variable number of the special inequality used for modelling + /*! \brief + The variable number of the special inequality used for modelling equality constraints.

The subset of equality constraints in a specific problem can be expressed @@ -433,15 +436,14 @@ private: dimension_type special_equality_row;

/*! \brief - The column number in the parametric part of the simplex tableau - which corresponds to the big parameter; \c not_a_dimension() - if not set. + The column index in the parametric part of the simplex tableau + corresponding to the big parameter; \c not_a_dimension() if not set. */ dimension_type big_dimension;

//! The possible values for the sign of a parametric linear expression. enum Row_Sign { - //! Not computed yet (default) + //! Not computed yet (default). UNKNOWN, //! All row coefficients are zero. ZERO, @@ -449,7 +451,7 @@ private: POSITIVE, //! All nonzero row coefficients are negative. NEGATIVE, - //! The row contains positive and negative coefficients. + //! The row contains both positive and negative coefficients. MIXED };

@@ -462,12 +464,12 @@ private: //! An indicator for solution validity. bool solution_valid;

- //! Determines the sign of given Row. + //! Returns the sign of row \p x. static Row_Sign row_sign(const Row& x, dimension_type big_dimension);

/*! \brief - Checks whether a constraint is compatible with a context, ie. does not - make the context empty. + Checks whether a constraint is compatible with a context, + i.e., if it does not make the context unsatisfiable.

The method consists in applying the revised dual simplex algorithm on a Matrix consisting in the original matrix with the constraint inserted. If @@ -518,30 +520,30 @@ protected: Update the solution values.

\param parameters - a \c std::set of indices of the parameters in the constraints + A \c std::set of indices of the parameters in the constraints */ - virtual void update_solution(const Variables_Set& parameters); + void update_solution(const Variables_Set& parameters);

/*! \brief Execute a parametric simplex on the tableau, under specified context.

\param parent_ref - a pointer to the parent reference to \p this + A pointer to the parent reference to \p this.

\param problem - the containing problem object + The containing problem object.

\param context - the context, being a set of constraints on the parameters + The context, being a set of constraints on the parameters.

\param params - local parameter set, including parent artificial parameters + The local set of parameters, including parent artificial parameters.

\param space_dimension - space dimension of parent, including artificial parameters + Space dimension of parent, including artificial parameters.

\return - An PIP_Problem_Status flag indicating the outcome of the optimization + A PIP_Problem_Status flag indicating the result of the optimization attempt (unfeasible or optimized problem). */ virtual PIP_Problem_Status solve(PIP_Tree_Node*& parent_ref, @@ -572,8 +574,9 @@ protected: Variables_Set& parameters, Matrix& context, dimension_type& space_dimension); - // FIXME: constructors to be decided. -}; + +}; // class PIP_Solution_Node +

//! A tree node representing a decision in the space of solutions. class PIP_Decision_Node : public PIP_Tree_Node {