Extract the value of interest rows and copy that to new Mat using concate.cpp

Extract the value of interest rows and copy that to new Mat using concate.cpp

//using concate
	cout << "\ncopy interest rows to new Mat using concate\n";
	Mat c;
	for (auto it : row_index_interest)
	{
		if (c.empty())
		{
			c = a.row(it);
			continue;
		}else{

			//cout << a.row(it) << endl;
			vconcat(c, a(Range(it, it+1), Range::all()), c);
			
			/* //or
			Mat t;
			vconcat(c, a(Range(it, it+1), Range::all()), t);
			c = t;
			*/
		}
	}

	cout << "\nnew Mat\n";
	cout << c << endl;