[Eigen] 복습 2일차

 
    //are two vectors orthogonal?
 
    vxd::t v1(4);
    vxd::t v2(4);
 
    v1 << -2, 3, 1,  4;
    v2 <<  1, 2, 0, -1;
 
    co(v1.dot(v2), "v1.dot(v2)");

 
    vxd::t v1(3);
    vxd::t v2(3);
 
    vxd::t v3(3);
    vxd::t v4(3);
 
    v1 << 2, -1, 3;
    v2 << 4, -1, 2;
 
 
    //find v3 which is projection of v1 on v2
    //and  v4 which is projection of v1 on orthogonal vector of v3(or v2)
 
 
    v3 = v_proj(v1, v2);
    v4 = v1 - v3;
 
    co(v3, "v3");
    co(v4, "v4");