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; }