(not an answer, more a hint, if you'd switch to the c++ api instead, peace of cake) :

double a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };

 cv::Mat Ma(3,4,CV_64FC1, a);

cout << Ma << endl;

[1, 2, 3, 4;
 5, 6, 7, 8;
 9, 10, 11, 12]

how i can switch to c++ , when i write cout my visual produce error

need to include iostream, also using namespace std;

thanks alot

when i write this code visual produce error

include <iostream>

include<core\core_c.h>

include<core\types_c.h>

include <highgui.h>

include <conio.h>

using namespace std;

int main()

{ int b; double a[] = { 3, 3, 3, 3, 3, 3, 7, 8, 9, 10, 11, 12 };

CvMat Ma=cvMat(3, 4, CV_64FC1, a);

cout<< Ma << endl; cin>>b; return(0);

} why???????/

CvMat, IplImage === c-api. cv::Mat === c++; cv::Mat != cvMat

really, stick with the c++ api, the old c one won't be supported for long

ok because i start learning opencv with learning opencv book and this book is for c api do u know a book or site learning opencv with c++???????

yes, the book is nice, still maybe look at the cpp samples in your opencv folder.

and ofc, the tutorials