Couenne  0.5.7
CouenneExprExp.hpp
Go to the documentation of this file.
1 /* $Id: CouenneExprExp.hpp 615 2011-06-08 20:36:24Z pbelotti $
2  *
3  * Name: exprExp.hpp
4  * Author: Pietro Belotti
5  * Purpose: definition of the exponential 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_EXPREXP_HPP
12 #define COUENNE_EXPREXP_HPP
13 
14 #include <math.h>
15 
16 #include "CouenneExprUnary.hpp"
17 
18 namespace Couenne {
19 
21 
22 class exprExp: public exprUnary {
23 
24  public:
25 
28  exprUnary (al) {} //< non-leaf expression, with argument list
29 
31  expression *clone (Domain *d = NULL) const
32  {return new exprExp (argument_ -> clone (d));}
33 
35  inline unary_function F () {return exp;}
36 
38  std::string printOp () const
39  {return "exp";}
40 
42  inline CouNumber gradientNorm (const double *x)
43  {return (argument_ -> Index () < 0) ? 0. : exp (x [argument_ -> Index ()]);}
44 
46  expression *differentiate (int index);
47 
49  void getBounds (expression *&, expression *&);
50 
52  virtual void getBounds (CouNumber &lb, CouNumber&ub);
53 
55  void generateCuts (expression *w, //const OsiSolverInterface &si,
56  OsiCuts &cs, const CouenneCutGenerator *cg,
57  t_chg_bounds * = NULL, int = -1,
60 
62  virtual enum expr_type code () {return COU_EXPREXP;}
63 
66 
69  virtual CouNumber selectBranch (const CouenneObject *obj,
70  const OsiBranchingInformation *info,
71  expression * &var,
72  double * &brpts,
73  double * &brDist, // distance of current LP
74  // point to new convexifications
75  int &way);
76 
78  virtual bool isBijective() const {return true;}
79 
81  virtual CouNumber inverse(expression *vardep) const
82  {
83  return log((*vardep)());
84  }
85 
88  virtual bool isCuttable (CouenneProblem *problem, int index) const;
89 
91  //virtual enum convexity convexity ()
92  //{return CONVEX;}
93 };
94 
95 }
96 
97 #endif
Number * x
void generateCuts(expression *w, OsiCuts &cs, const CouenneCutGenerator *cg, t_chg_bounds *=NULL, int=-1, CouNumber=-COUENNE_INFINITY, CouNumber=COUENNE_INFINITY)
Generate convexification cuts for this expression.
#define COUENNE_INFINITY
virtual CouNumber inverse(expression *vardep) const
inverse of exponential
expr_type
code returned by the method expression::code()
CouNumber(* unary_function)(CouNumber)
unary function, used in all exprUnary
CouExpr & log(CouExpr &e)
virtual bool isBijective() const
return true if bijective
void getBounds(expression *&, expression *&)
Get lower and upper bound of an expression (if any)
expression * clone(Domain *d=NULL) const
Cloning method.
Cut Generator for linear convexifications.
auxSign
"sign" of the constraint defining an auxiliary.
class for the exponential,
double CouNumber
main number type in Couenne
expression class for unary functions (sin, log, etc.)
expression * differentiate(int index)
Differentiation.
CouExpr & exp(CouExpr &e)
bool impliedBound(int, CouNumber *, CouNumber *, t_chg_bounds *, enum auxSign=expression::AUX_EQ)
Implied bound processing.
Class for MINLP problems with symbolic information.
CouNumber gradientNorm(const double *x)
return l-2 norm of gradient at given point
Define a dynamic point+bounds, with a way to save and restore previous points+bounds through a LIFO s...
int Index
exprExp(expression *al)
Constructor.
expression * argument_
single argument taken by this expression
virtual enum expr_type code()
Code for comparisons.
OsiObject for auxiliary variables $w=f(x)$.
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.
Expression base class.
virtual bool isCuttable(CouenneProblem *problem, int index) const
can this expression be further linearized or are we on its concave ("bad") side
std::string printOp() const
Print operator.
status of lower/upper bound of a variable, to be checked/modified in bound tightening
unary_function F()
The operator's function.
general include file for different compilers