Couenne 0.5.8
CouenneExprAbs.hpp
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1/* $Id: CouenneExprAbs.hpp 615 2011-06-08 20:36:24Z pbelotti $
2 *
3 * Name: exprAbs.hpp
4 * Author: Pietro Belotti
5 * Purpose: definition of the absolute value of a function
6 *
7 * (C) Carnegie-Mellon University, 2006-10.
8 * This file is licensed under the Eclipse Public License (EPL)
9 */
10
11#ifndef COUENNE_EXPRABS_HPP
12#define COUENNE_EXPRABS_HPP
13
14#include <math.h>
15
16#include "CouenneExprUnary.hpp"
17#include "CouenneExprConst.hpp"
18
19namespace Couenne {
20
22
23class exprAbs: public exprUnary {
24
25 public:
26
29 exprUnary (al) {} //< non-leaf expression, with argument list
30
32 inline unary_function F () {return fabs;}
33
35 expression *clone (Domain *d = NULL) const
36 {return new exprAbs (argument_ -> clone (d));}
37
39 std::string printOp () const
40 {return "abs";}
41
43 inline CouNumber gradientNorm (const double *x)
44 {return ((argument_ -> Index () < 0) ? 0. : 1.);}
45
48
50 virtual void getBounds (expression *&, expression *&);
51
53 virtual 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 enum expr_type code () {return COU_EXPRABS;}
64
66 inline bool isInteger ()
67 {return argument_ -> isInteger ();}
68
71
74 virtual CouNumber selectBranch (const CouenneObject *obj,
75 const OsiBranchingInformation *info,
76 expression * &var,
77 double * &brpts,
78 double * &brDist, // distance of current LP
79 // point to new convexifications
80 int &way);
81
83 virtual void closestFeasible (expression *varind, expression *vardep,
84 CouNumber& left, CouNumber& right) const;
85
88 virtual bool isCuttable (CouenneProblem *problem, int index) const;
89
91 //virtual enum convexity convexity () const;
92};
93
94}
95
96#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...
expression * clone(Domain *d=NULL) const
cloning method
virtual void getBounds(CouNumber &lb, CouNumber &ub)
Get value of lower and upper bound of an expression (if any)
enum expr_type code()
code for comparisons
bool isInteger()
is this expression integer?
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
exprAbs(expression *al)
Constructor.
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
virtual void getBounds(expression *&, expression *&)
Get lower and upper bound of an expression (if any)
unary_function F()
The operator's function.
CouNumber gradientNorm(const double *x)
return l_2 norm of gradient at given point
virtual void closestFeasible(expression *varind, expression *vardep, CouNumber &left, CouNumber &right) const
closest feasible points in function in both directions
std::string printOp() const
output
virtual bool isCuttable(CouenneProblem *problem, int index) const
can this expression be further linearized or are we on its concave ("bad") side
bool impliedBound(int, CouNumber *, CouNumber *, t_chg_bounds *, enum auxSign=expression::AUX_EQ)
implied bound processing
expression * differentiate(int index)
differentiation
expression class for unary functions (sin, log, etc.)
expression * argument_
single argument taken by this expression
Expression base class.
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()
ipindex Index