calc_distance.hh

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/// @file numeric/kdtree/kdtree.hh
/// @brief utility functions for kd-tree. See kdtree.hh for more information.
/// @author James Thompson
#ifndef INCLUDED_numeric_kdtree_calc_distance_hh
#define INCLUDED_numeric_kdtree_calc_distance_hh

#include <numeric/types.hh>
#include <utility/vector1.hh>

namespace numeric {
namespace kdtree {

/// distance metrics for real-valued points

/// @brief Returns the square of the Euclidean distance between the two points
/// vec1 and vec2.
numeric::Real sq_vec_distance(
  utility::vector1< numeric::Real > const & vec1,
  utility::vector1< numeric::Real > const & vec2
);

/// @brief Returns the Euclidean distance between the two points vec1 and vec2.
numeric::Real vec_distance(
  utility::vector1< numeric::Real > const & vec1,
  utility::vector1< numeric::Real > const & vec2
);

} // kdtree
} // numeric

#endif