OpencvとC++でMatを作成する方法

#include 
#include 
#include 
#include 

using namespace cv;
using namespace std;
int main()
{

 Mat M(2, 2, CV_8UC3, Scalar(0, 0, 255));
 cout << "M = " << endl << M << endl;
 Mat M;
 M.create(4, 4, CV_8UC(2));
 cout << "M = " << endl << M << endl;
 Mat M = (Mat_(3, 3) << 0, 1, 2, 3, 4, 5, 6, 7, 8);
 cout << "M = " << endl << M << endl;
 Mat e = Mat::eye(4, 4, CV_64F);
 Mat o = Mat::ones(2, 2, CV_32F);
 Mat z = Mat::zeros(3, 3, CV_8UC1);

 system("pause");
 return 1;

}