sum.hpp

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#ifndef __STAN__MATH__FUNCTIONS__SUM_HPP__
#define __STAN__MATH__FUNCTIONS__SUM_HPP__

#include <vector>

namespace stan {
  namespace math {

    inline double sum(std::vector<double>& x) {
      double sum = x[0];
      for (size_t i = 1; i < x.size(); ++i)
        sum += x[i];
      return sum;
    }

  }
}

#endif