Couenne  0.5.8
CouenneExprOddPow.hpp
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1 /* $Id: CouenneExprOddPow.hpp 698 2011-06-20 13:36:43Z pbelotti $
2  *
3  * Name: CouenneExprOddPow.hpp
4  * Author: Pietro Belotti
5  * Purpose: definition of powers with odd exponent
6  *
7  * (C) Pietro Belotti 2011
8  * This file is licensed under the Eclipse Public License (EPL)
9  */
10 
11 #ifndef COUENNE_EXPRODDPOW_HPP
12 #define COUENNE_EXPRODDPOW_HPP
13 
14 #include <math.h>
15 
16 #include "CouenneExprPow.hpp"
17 
18 namespace Couenne {
19 
21 
22  class exprOddPow: public exprPow {
23 
24  public:
25 
27  exprOddPow (expression **al, int n = 2):
28  exprOp (al, n) {} //< non-leaf expression, with argument list
29 
32  exprOp (arg0, arg1) {}
33 
35  expression *clone (Domain *d = NULL) const
36  {return new exprOddPow (clonearglist (d), nargs_);}
37 
39  std::string printOp () const
40  {return "^";}
41 
44 
46  void getBounds (expression *&, expression *&);
47 
49  void getBounds (CouNumber &lb, CouNumber &ub);
50 
53  exprAux *standardize (CouenneProblem *p, bool addAux = true);
54 
56  void generateCuts (expression *w, //const OsiSolverInterface &si,
57  OsiCuts &cs, const CouenneCutGenerator *cg,
58  t_chg_bounds * = NULL, int = -1,
61 
65  {return arglist_ [0];}
66 
68  virtual enum expr_type code ()
69  {return COU_EXPRPOW;}
70 
73 
76  virtual CouNumber selectBranch (const CouenneObject *obj,
77  const OsiBranchingInformation *info,
78  expression * &var,
79  double * &brpts,
80  double * &brDist, // distance of current LP
81  // point to new convexifications
82  int &way);
83 
86  virtual bool isCuttable (CouenneProblem *problem, int index) const;
87  };
88 
91  // return (currValue_ = safe_pow (base, exponent));
92  return (safe_pow ((**arglist_) (), (*(arglist_ [1])) ()));
93  }
94 }
95 
96 #endif
Couenne::t_chg_bounds
status of lower/upper bound of a variable, to be checked/modified in bound tightening
Definition: CouenneTypes.hpp:66
Couenne::exprOddPow
Power of an expression (binary operator), with constant.
Definition: CouenneExprOddPow.hpp:22
Couenne::exprOp::nargs_
int nargs_
number of arguments (cardinality of arglist)
Definition: CouenneExprOp.hpp:36
Couenne::expr_type
expr_type
code returned by the method expression::code()
Definition: CouenneTypes.hpp:40
Couenne::exprOp
general n-ary operator-type expression: requires argument list.
Definition: CouenneExprOp.hpp:31
COUENNE_INFINITY
#define COUENNE_INFINITY
Definition: CouennePrecisions.hpp:32
Couenne::exprOddPow::operator()
CouNumber operator()()
function for the evaluation of the expression
Definition: CouenneExprOddPow.hpp:90
Couenne::exprOddPow::code
virtual enum expr_type code()
code for comparison
Definition: CouenneExprOddPow.hpp:68
Couenne::exprPow
Power of an expression (binary operator), with constant.
Definition: CouenneExprPow.hpp:30
Couenne::exprOddPow::generateCuts
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
Couenne::expression::AUX_EQ
@ AUX_EQ
Definition: CouenneExpression.hpp:55
Couenne::COU_EXPRPOW
@ COU_EXPRPOW
Definition: CouenneTypes.hpp:46
CouenneExprPow.hpp
Couenne::exprOp::clonearglist
expression ** clonearglist(Domain *d=NULL) const
clone argument list (for use with clone method)
Definition: CouenneExprOp.hpp:97
Couenne::CouenneCutGenerator
Cut Generator for linear convexifications.
Definition: CouenneCutGenerator.hpp:49
Couenne::exprOddPow::standardize
exprAux * standardize(CouenneProblem *p, bool addAux=true)
reduce expression in standard form, creating additional aux variables (and constraints)
Couenne
general include file for different compilers
Definition: CouenneAggrProbing.hpp:24
Couenne::exprOddPow::selectBranch
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
Couenne::exprOddPow::getFixVar
expression * getFixVar()
return an index to the variable's argument that is better fixed in a branching rule for solving a non...
Definition: CouenneExprOddPow.hpp:64
Couenne::CouenneObject
OsiObject for auxiliary variables $w=f(x)$.
Definition: CouenneObject.hpp:57
Couenne::CouNumber
double CouNumber
main number type in Couenne
Definition: CouenneTypes.hpp:100
Couenne::exprOddPow::clone
expression * clone(Domain *d=NULL) const
cloning method
Definition: CouenneExprOddPow.hpp:35
OsiCuts
Couenne::expression::auxSign
auxSign
"sign" of the constraint defining an auxiliary.
Definition: CouenneExpression.hpp:55
Couenne::exprOddPow::exprOddPow
exprOddPow(expression *arg0, expression *arg1)
Constructor with only two arguments.
Definition: CouenneExprOddPow.hpp:31
OsiBranchingInformation
Couenne::exprOddPow::printOp
std::string printOp() const
print operator
Definition: CouenneExprOddPow.hpp:39
Couenne::safe_pow
CouNumber safe_pow(CouNumber base, CouNumber exponent, bool signpower=false)
compute power and check for integer-and-odd inverse exponent
Definition: CouenneExprPow.hpp:133
Couenne::exprOddPow::isCuttable
virtual bool isCuttable(CouenneProblem *problem, int index) const
can this expression be further linearized or are we on its concave ("bad") side
Couenne::exprOddPow::impliedBound
bool impliedBound(int, CouNumber *, CouNumber *, t_chg_bounds *, enum auxSign=expression::AUX_EQ)
implied bound processing
Couenne::exprOddPow::getBounds
void getBounds(expression *&, expression *&)
Get lower and upper bound of an expression (if any)
Couenne::CouenneProblem
Class for MINLP problems with symbolic information.
Definition: CouenneProblem.hpp:169
Couenne::exprOp::arglist_
expression ** arglist_
argument list is an array of pointers to other expressions
Definition: CouenneExprOp.hpp:35
Couenne::exprAux
Auxiliary variable.
Definition: CouenneExprAux.hpp:32
Couenne::expression
Expression base class.
Definition: CouenneExpression.hpp:48
Couenne::Domain
Define a dynamic point+bounds, with a way to save and restore previous points+bounds through a LIFO s...
Definition: CouenneDomain.hpp:104
Couenne::exprOddPow::exprOddPow
exprOddPow(expression **al, int n=2)
Constructor.
Definition: CouenneExprOddPow.hpp:27