87 lines
1.2 KiB
C++
Executable File
87 lines
1.2 KiB
C++
Executable File
//
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// Math.hpp
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// amoeba
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//
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// Created by Timothy Prepscius on 12/30/16.
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// Copyright © 2016 Timothy Prepscius. All rights reserved.
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//
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#pragma once
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namespace tjp::core::math {
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template<typename T>
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struct Mean_SumDivide
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{
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T t = zero<T>();
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size_t count = 0;
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void add(const T &v)
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{
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t = t + v;
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count++;
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}
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T mean() const
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{
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return t / count;
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}
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};
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// https://www.geeksforgeeks.org/program-for-average-of-an-array-without-running-into-overflow/
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template<typename T>
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struct Mean_AddDivide
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{
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T t = zero<T>();
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size_t count = 0;
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void add(const T &v)
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{
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++count;
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t = t + (v - t) / (count);
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}
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T mean() const
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{
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return t / count;
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}
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} ;
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// https://www.geeksforgeeks.org/compute-average-two-numbers-without-overflow/
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template<typename T>
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struct Mean_AddDivideMod
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{
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T t = zero<T>();
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size_t count = 0;
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void add(const T &v)
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{
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++count;
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t = t + (v - t) / (count);
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}
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T mean() const
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{
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return t / count;
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}
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} ;
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template<typename T, typename U>
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auto mean_(const U &u)
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{
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T t;
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for (auto &v: u)
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t.add(v);
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return t.mean();
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}
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template<typename U>
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auto mean(const U &u)
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{
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return mean_<Mean_SumDivide<typename U::value_type>>(u);
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}
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} // namespace
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