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//
// $Id$
//
//
// Original author: Witold Wolski <wewolski@gmail.com>
//
// Copyright : ETH Zurich
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef DETERMINEBINWIDTH_H
#define DETERMINEBINWIDTH_H
#include <cmath>
#include <boost/assert.hpp>
#include <boost/range/algorithm_ext.hpp>
#include <boost/bind.hpp>
#include <algorithm>
#include "pwiz/utility/findmf/base/base/diff.hpp"
#include "pwiz/utility/findmf/base/resample/utilities/determinebinwidth.hpp"
namespace ralab
{
namespace base
{
namespace resample
{
template<typename TReal>
struct SquareRoot{
TReal operator()(TReal x) const{
return(sqrt(x));
}
};
struct SamplingWith{
std::vector<double> diff_;
std::vector<double> summ_;
std::vector<double> am_;
//expects a sorted sequence
template<typename TRealI>
double operator()(TRealI begin, TRealI end)
{
//BOOST_ASSERT(!boost::range::is_sorted(begin,end));
typedef typename std::iterator_traits<TRealI>::value_type TReal;
std::size_t N = std::distance(begin,end);
double am;
if(N > 1){
diff_.resize(N-1);
summ_.resize(N-1);
am_.resize(N-1);
ralab::base::base::diff(begin,end,diff_.begin(),1);
utilities::summ( begin , end, summ_.begin(),1);
//square the sum
//std::transform(summ_.begin(),summ_.end(),summ_.begin(),boost::bind(sqrt,_1));
std::transform(summ_.begin(),summ_.end(),summ_.begin(),SquareRoot<TReal>());
std::transform(diff_.begin(),diff_.end(),summ_.begin(),am_.begin(),std::divides<double>());
std::sort(am_.begin(),am_.end());
am = utilities::determine(am_.begin(),am_.end());
}else{
am = 0.;
}
return am;
}
};
}
}
}
#endif // DETERMINEBINWIDTH_H
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