Couenne 0.5.8
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CouenneExprFloor.hpp
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1/* $Id: CouenneExprFloor.hpp 720 2011-06-27 13:31:26Z pbelotti $
2 *
3 * Name: exprFloor.hpp
4 * Author: Pietro Belotti
5 * Purpose: definition of floor
6 *
7 * (C) Pietro Belotti, 2011.
8 * This file is licensed under the Eclipse Public License (EPL)
9 */
10
11#ifndef COUENNE_EXPRFLOOR_HPP
12#define COUENNE_EXPRFLOOR_HPP
13
14#include "CouenneExpression.hpp"
15
16namespace Couenne {
17
19
20class exprFloor: public exprUnary {
21
22 public:
23
26 exprUnary (arg) {}
27
29 expression *clone (Domain *d = NULL) const
30 {return new exprFloor (argument_ -> clone (d));}
31
33 inline unary_function F ()
34 {return floor;}
35
37 std::string printOp () const
38 {return "floor";}
39
41 inline CouNumber gradientNorm (const double *x) {
42 return (argument_ -> Index () < 0) ?
43 0. : fabs (x [argument_ -> Index ()]);
44 }
45
48
51
53 void getBounds (CouNumber &lb, CouNumber &ub);
54
56 void generateCuts (expression *w, //const OsiSolverInterface &si,
57 OsiCuts &cs, const CouenneCutGenerator *cg,
58 t_chg_bounds * = NULL, int = -1,
61
63 virtual enum expr_type code ()
64 {return COU_EXPRFLOOR;}
65
67 bool impliedBound (int index, CouNumber *l, CouNumber *u, t_chg_bounds *chg, enum auxSign = expression::AUX_EQ) {
68
69 bool impl = true;
70 return impl;
71 }
72
75 virtual CouNumber selectBranch (const CouenneObject *obj,
76 const OsiBranchingInformation *info,
77 expression * &var,
78 double * &brpts,
79 double * &brDist, // distance of current LP
80 // point to new convexifications
81 int &way)
82 {return 0.;}
83
85 virtual void closestFeasible (expression *varind, expression *vardep,
86 CouNumber& left, CouNumber& right) const;
87
90 virtual bool isCuttable (CouenneProblem *problem, int index) const
91 {return false;}
92
94 //virtual enum convexity convexity () const;
95};
96
97}
98
99#endif
#define COUENNE_INFINITY
Cut Generator for linear convexifications.
OsiObject for auxiliary variables $w=f(x)$.
Class for MINLP problems with symbolic information.
Define a dynamic point+bounds, with a way to save and restore previous points+bounds through a LIFO s...
virtual void closestFeasible(expression *varind, expression *vardep, CouNumber &left, CouNumber &right) const
closest feasible points in function in both directions
virtual bool isCuttable(CouenneProblem *problem, int index) const
can this expression be further linearized or are we on its concave ("bad") side?
virtual enum expr_type code()
code for comparisons
void getBounds(CouNumber &lb, CouNumber &ub)
Get value of lower and upper bound of an expression.
expression * differentiate(int index)
obtain derivative of expression
void generateCuts(expression *w, OsiCuts &cs, const CouenneCutGenerator *cg, t_chg_bounds *=NULL, int=-1, CouNumber=-COUENNE_INFINITY, CouNumber=COUENNE_INFINITY)
generate equality between *this and *w
unary_function F()
the operator itself (e.g. sin, log...)
CouNumber gradientNorm(const double *x)
return l-2 norm of gradient at given point
void getBounds(expression *&, expression *&)
Get lower and upper bound of an expression (if any)
expression * clone(Domain *d=NULL) const
cloning method
exprFloor(expression *arg)
constructor, destructor
bool impliedBound(int index, CouNumber *l, CouNumber *u, t_chg_bounds *chg, enum auxSign=expression::AUX_EQ)
implied bound processing
virtual CouNumber selectBranch(const CouenneObject *obj, const OsiBranchingInformation *info, expression *&var, double *&brpts, double *&brDist, int &way)
Set up branching object by evaluating many branching points for each expression's arguments.
std::string printOp() const
print operator
expression class for unary functions (sin, log, etc.)
expression * argument_
single argument taken by this expression
Expression base class.
virtual int Index() const
Return index of variable (only valid for exprVar and exprAux)
auxSign
"sign" of the constraint defining an auxiliary.
status of lower/upper bound of a variable, to be checked/modified in bound tightening
general include file for different compilers
double CouNumber
main number type in Couenne
CouNumber(* unary_function)(CouNumber)
unary function, used in all exprUnary
expr_type
code returned by the method expression::code()