#include "lin_alg.h"

vector3d unit_x(1,0,0);
vector3d unit_y(0,1,0);
vector3d unit_z(0,0,1);
vector3d vec_zero(0,0,0);
vector3d vec_one(1,1,1);
matrix3d mat_zero(vec_zero, vec_zero, vec_zero);
matrix3d mat_ident(unit_x, unit_y, unit_z);