source: trunk/yat/normalizer/ColumnNormalizer.h @ 1520

#ifndef _theplu_yat_normalizer_column_normalizer_
#define _theplu_yat_normalizer_column_normalizer_

/*
  Copyright (C) 2008 Peter Johansson

  This file is part of the yat library, http://dev.thep.lu.se/yat

  The yat library is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 3 of the
  License, or (at your option) any later version.

  The yat library 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
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with yat. If not, see <http://www.gnu.org/licenses/>.
*/

#include "yat/utility/Matrix.h"
#include "yat/utility/yat_assert.h"

#include <stdexcept>

namespace theplu {
namespace yat {
namespace normalizer {

  /**
     \brief Normalize each column

     Using a functor T to normalize each column.

     \since New in yat 0.5
   */
  template<class T>
  class ColumnNormalizer
  {
  public:
    /**
       functor used to normalize each column
    */
    typedef T normalizer_type;

    /**
       \brief Default constructor
     */
    ColumnNormalizer(void) {}

    /**
       \brief Constructor taking a functor \a norm
     */
    ColumnNormalizer(T norm) 
      : normalizer_(norm) {}

    /**
       Each column in \a matrix is normalized using class T, and
       assigned to Matrix \a result.

       \note \a result must have same dimensions as \a matrix.
     */
    void operator()(const utility::Matrix& matrix, 
                    utility::Matrix& result) const;
  private:
    T normalizer_;
  };

  template<class T>
  void ColumnNormalizer<T>::operator()(const utility::Matrix& matrix, 
                                       utility::Matrix& result) const
  {
    using utility::yat_assert;
    yat_assert<std::runtime_error>(matrix.rows()==result.rows(),
                                   "ColumnNormalizer: rows mismatch");
    yat_assert<std::runtime_error>(matrix.columns()==result.columns(),
                                   "ColumnNormalizer: columns mismatch");
    for (size_t i=0; i<matrix.columns(); ++i)
      normalizer_(matrix.begin_column(i), matrix.end_column(i),
                  result.begin_column(i));

  }


}}} // end of namespace normalizer, yat and thep
#endif