code: def __neighbor_indexes_distance_matrix(self, index_point):
          
          distances = self.__pointer_data[index_point]
          return [index_neighbor for index_neighbor in range(len(distances))
                  if ((distances[index_neighbor] <= self.__eps) and (index_neighbor != index_point))]
docs: !
          @brief Return neighbors of the specified object in case of distance matrix.
  
          @param[in] index_point (uint): Index point whose neighbors are should be found.
  
          @return (list) List of indexes of neighbors in line the connectivity radius.