STK_Kernel_IKernel.h

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/*--------------------------------------------------------------------*/
/*     Copyright (C) 2004-2016  Serge Iovleff, Université Lille 1, Inria
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public
    License along with this program; if not, write to the
    Free Software Foundation, Inc.,
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    Contact : S..._Dot_I..._At_stkpp_Dot_org (see copyright for ...)
*/
 
/*
 * Project:  stkpp::Stat::Kernel
 * created on: 5 avr. 2015
 * Author:   iovleff, S..._Dot_I..._At_stkpp_Dot_org (see copyright for ...)
 **/
 
#ifndef STK_KERNEL_IKERNEL_H
#define STK_KERNEL_IKERNEL_H
 
#include <Sdk.h>
#include <Arrays/include/STK_CArraySquare.h>
 
namespace STK
{
 
namespace Kernel
{
class IKernel: public IRunnerBase
{
  public:
    inline IKernel(): IRunnerBase(), gram_() {}
    inline IKernel(IKernel const& kernel): IRunnerBase(kernel), gram_(kernel.gram_) {}
    inline virtual ~IKernel() {}
 
    // getters
    inline CSquareX const& k() const { return gram_;}
    inline CSquareX const& gram() const { return gram_;}
 
    // method using the gram matrix
    inline Real kcomp(int i, int j) const { return gram_(i,j);}
    inline Real kdist(int i, int j) const { return gram_(i,i)+gram_(j,j)-2*gram_(i,j);}
    inline Real kdiag(int i) const { return gram_(i,i);};
 
    // method computing the values of the gram matrix
    virtual Real comp(int i, int j) const =0;
    inline Real dist(int i, int j) const { return comp(i,i)+comp(j,j)-2*comp(i,j);}
    virtual inline Real diag(int i) const { return comp(i,i);};
 
    // pure virtual
    virtual int nbSample() const =0;
    virtual int nbVariable() const =0;
 
  protected:
    CSquareX gram_;
};
 
 
} // namespace Kernel
 
} // namespace STK
 
#endif /* STK_KERNEL_IKERNEL_H */