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(C++) GetSum (on matrix)

Matrix code snippet to sum all values in a two-dimensional matrix. To sum all values in a one-dimensional container, go to the GetSum (on container) page.

#include <algorithm>

#include <numeric>

#include <vector>

//From http://www.richelbilderbeek.nl/CppGetSum.htm

template <class T>

const T::value_type GetSum(const T& v)

{

return std::accumulate(v.begin(), v.end(), static_cast<T::value_type>(0.0));

}

//From http://www.richelbilderbeek.nl/CppGetSumMatrix.htm

template <class T>

const T GetSum(const std::vector<std::vector<T> >& v)

{

T sum = static_cast<T>(0.0);

typedef std::vector<std::vector<T> >::const_iterator Iterator;

const Iterator j = v.end();

for (Iterator i = v.begin(); i!=j; ++i)

{

sum+=GetSum(*i);

}

return sum;

}

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