eigen3库的赋值操作

           　Eigen::Matrix3d matrix3d(3, 3);
         　matrix3d(0, 0) = -0.2822;
            matrix3d(0, 1) = 0.9594;
            matrix3d(0, 2) = 0;
            matrix3d(1, 0) = 0.9594;
            matrix3d(1, 1) = 0.2822;
            matrix3d(1, 2) = 0;
            matrix3d(2, 0) = 0;
            matrix3d(2, 1) = 0;
            matrix3d(2, 2) = 0;

            matrix3d<<-0.2822, 0.9594 , 0.
                    ,0.9594 , 0.2822,  0.
                    ,-0.     , 0.    , -0.  ;