oencv学习（10）opencv mul()每个元素相乘

double m[4][4] = {1.0,2.0,3.0,4.0,5.0,6.0,7.0,8.0,9.0,10.0,11.0,12.0,13.0,14.0,15.0,16.0};   
Mat M = Mat(4, 4, CV_64F ,m); 

Mat N=M.mul(M);
show(N);