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GenericFunctions/FunctionDirectProduct.hh
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1 // -*- C++ -*-
2 // $Id: FunctionDirectProduct.hh,v 1.2 2003/09/06 14:04:13 boudreau Exp $
3 //--------------------------FunctionDirectProduct---------------------------//
4 // //
5 // FunctionDirectProduct, result of multiplication of taking the direct //
6 // product of two functions: f(x)*g(y)= h(x,y). The direct product always //
7 // gives a function taking an argument of higher dimensionality than the //
8 // arguments. //
9 // //
10 // Joe Boudreau, Petar Maksimovic, November 1999 //
11 // //
12 //--------------------------------------------------------------------------//
13 #ifndef FunctionDirectProduct_h
14 #define FunctionDirectProduct_h 1
16 
17 namespace Genfun {
18 
23  class FunctionDirectProduct : public AbsFunction {
24 
26 
27  public:
28 
29  // Constructor
30  FunctionDirectProduct(const AbsFunction *arg1, const AbsFunction *arg2);
31 
32  // Copy constructor
34 
35  // Destructor
36  virtual ~FunctionDirectProduct();
37 
38  // Retreive function value
39  virtual double operator ()(double argument) const; // Gives an error.
40  virtual double operator ()(const Argument & a) const; // Must use this one
41 
42  // Dimensionality
43  virtual unsigned int dimensionality() const;
44 
45  // Derivative.
46  Derivative partial (unsigned int) const;
47 
48  // Does this function have an analytic derivative?
49  virtual bool hasAnalyticDerivative() const {return true;}
50 
51  private:
52 
53  // It is illegal to assign a FunctionDirectProduct
54  const FunctionDirectProduct & operator=(const FunctionDirectProduct &right);
55 
56  AbsFunction *_arg1;
57  AbsFunction *_arg2;
58  unsigned int _m; // dimension of arg1
59  unsigned int _n; // dimension of arg2
60 
61  };
62 } // namespace Genfun
63 #endif
FunctionDirectProduct(const AbsFunction *arg1, const AbsFunction *arg2)
Derivative partial(unsigned int) const
#define FUNCTION_OBJECT_DEF(classname)
virtual unsigned int dimensionality() const
virtual double operator()(double argument) const