89 lines
2.1 KiB
C++
89 lines
2.1 KiB
C++
// (C) Copyright John Maddock 2005-2006.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_MATH_TOOLS_STATS_INCLUDED
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#define BOOST_MATH_TOOLS_STATS_INCLUDED
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#ifdef _MSC_VER
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#pragma once
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#endif
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#include <boost/config/no_tr1/cmath.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/math/tools/precision.hpp>
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namespace boost{ namespace math{ namespace tools{
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template <class T>
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class stats
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{
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public:
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stats()
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: m_min(tools::max_value<T>()),
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m_max(-tools::max_value<T>()),
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m_total(0),
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m_squared_total(0),
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m_count(0)
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{}
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void add(const T& val)
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{
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if(val < m_min)
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m_min = val;
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if(val > m_max)
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m_max = val;
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m_total += val;
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++m_count;
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m_squared_total += val*val;
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}
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T min BOOST_PREVENT_MACRO_SUBSTITUTION()const{ return m_min; }
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T max BOOST_PREVENT_MACRO_SUBSTITUTION()const{ return m_max; }
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T total()const{ return m_total; }
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T mean()const{ return m_total / static_cast<T>(m_count); }
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boost::uintmax_t count()const{ return m_count; }
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T variance()const
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{
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BOOST_MATH_STD_USING
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T t = m_squared_total - m_total * m_total / m_count;
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t /= m_count;
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return t;
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}
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T variance1()const
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{
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BOOST_MATH_STD_USING
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T t = m_squared_total - m_total * m_total / m_count;
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t /= (m_count-1);
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return t;
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}
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T rms()const
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{
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BOOST_MATH_STD_USING
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return sqrt(m_squared_total / static_cast<T>(m_count));
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}
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stats& operator+=(const stats& s)
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{
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if(s.m_min < m_min)
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m_min = s.m_min;
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if(s.m_max > m_max)
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m_max = s.m_max;
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m_total += s.m_total;
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m_squared_total += s.m_squared_total;
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m_count += s.m_count;
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return *this;
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}
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private:
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T m_min, m_max, m_total, m_squared_total;
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boost::uintmax_t m_count;
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};
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} // namespace tools
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} // namespace math
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} // namespace boost
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#endif
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