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For R_y and R_z. You can't used index 0. //next we need to compose the 3 rotations into their matrix forms cv::Mat_<double> R_x(3,3);

R_x << 1, 0, 0,
       0, cos(E_x[0]), -sin(E_x[0]),
       0, sin(E_x[0]), cos(E_x[0]);

cv::Mat_<double> R_y(3,3);

R_y << cos(E_y[1]), 0, sin(E_y[1]),
       0, 1, 0
       -sin(E_y[1]), 0, cos(E_y[1]);

cv::Mat_<double> R_z(3,3);

R_z << cos(E_z[2]), -sin(E_z[2]), 0,
       sin(E_z[2]), cos(E_z[2]), 0,
       0, 0, 1;

R = R_x * R_y * R_z;

For R_y and R_z. You can't used index 0. 0.

//next we need to compose the 3 rotations into their matrix forms
 cv::Mat_<double> R_x(3,3);
R_x(3,3);
  
R_x << 1, 0, 0,
       0, cos(E_x[0]), -sin(E_x[0]),
       0, sin(E_x[0]), cos(E_x[0]);

cv::Mat_<double> R_y(3,3);

R_y << cos(E_y[1]), 0, sin(E_y[1]),
       0, 1, 0
       -sin(E_y[1]), 0, cos(E_y[1]);

cv::Mat_<double> R_z(3,3);

R_z << cos(E_z[2]), -sin(E_z[2]), 0,
       sin(E_z[2]), cos(E_z[2]), 0,
       0, 0, 1;

R = R_x * R_y * R_z;