mean.hpp

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#ifndef __STAN__MATH__MATRIX__MEAN_HPP__
#define __STAN__MATH__MATRIX__MEAN_HPP__

#include <vector>
#include <boost/math/tools/promotion.hpp>
#include <stan/math/matrix/Eigen.hpp>
#include <stan/math/matrix/validate_nonzero_size.hpp>

namespace stan {
  namespace math {
    
    template <typename T>
    inline 
    typename boost::math::tools::promote_args<T>::type
    mean(const std::vector<T>& v) {
      validate_nonzero_size(v,"mean");
      T sum(v[0]);
      for (size_t i = 1; i < v.size(); ++i)
        sum += v[i];
      return sum / v.size();
    }

    template <typename T, int R, int C>
    inline  
    typename boost::math::tools::promote_args<T>::type
    mean(const Eigen::Matrix<T,R,C>& m) {
      validate_nonzero_size(m,"mean");
      return m.mean();
    }    
    
  }
}
#endif