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/*
* Copyright 2009-2011 The VOTCA Development Team (http://www.votca.org)
*
* 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 _AVERAGE_H
#define _AVERAGE_H
namespace votca { namespace tools {
// do not use this calss yet!
template<typename T>
class Average
{
public:
Average();
~Average() {}
void Process(const T &v);
void Clear();
template<typename iterator_type>
void ProcessRange(const iterator_type &begin, const iterator_type &end);
T CalcDev();
T CalcSig2();
const T &getAvg();
const T getM2();
size_t getN();
private:
size_t _n;
T _av; // average
T _m2; // second moment
};
template<typename T>
Average<T>::Average()
: _n(0) {}
template <>
inline Average<double>::Average()
: _n(0), _av(0), _m2(0) {}
template<typename T>
inline void Average<T>::Process(const T &value)
{
_av = _av*(double)_n/(double)(_n+1) + value / (double)(_n+1);
_n++;
_m2 += value*value;
}
template<typename T>
inline void Average<T>::Clear()
{
_av = 0;
_n = 0;
_m2 = 0 ;
}
/*
template<>
inline void Average<double>::Process(const double &value)
{
_av = _av*(double)_n/(double)(_n+1) + value / (double)(_n+1);
_n++;
_m2 += value*value;
}
*/
template<typename T>
template<typename iterator_type>
void Average<T>::ProcessRange(const iterator_type &begin, const iterator_type &end){
for(iterator_type iter=begin; iter!=end; ++iter){
Process(*iter);
}
}
template<typename T>
T Average<T>::CalcDev(){
double dev = 0.0;
dev = sqrt((_m2-_n*_av*_av)/(_n-1));
return dev;
}
template<typename T>
T Average<T>::CalcSig2(){
double dev = 0.0;
dev = _m2/_n-_av*_av ;
return dev;
}
template<typename T>
const T &Average<T>::getAvg(){
return _av;
}
template<typename T>
const T Average<T>::getM2(){
double m2 = 0.0;
m2 = _m2/_n;
return m2;
}
template<typename T>
size_t Average<T>::getN(){
return _n;
}
}}
#endif /* _AVERAGE_H */
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