Extract the value of interest rows and copy that to new Mat

Simple example code.

using push_back
#gistcode

	cout << "origin\n";
	Mat a = (Mat_<int>(5, 5) << 1, 2, 3, 4, 5,
	7, 8, 9, 10, 11,
	12, 13, 14, 15, 16,
	17, 18, 19, 20, 21,
	22, 23, 24, 25, 26);
	cout << a << endl;
	cout << "\ninterest index of row - 0,3\n";
	vector< int> row_index_interest;
	row_index_interest.push_back(0);
	row_index_interest.push_back(3);
	cout << "\ncopy interest rows to new Mat\n";
	Mat b;
	for (auto it: row_index_interest)
	{
	cout << a.row(it) << endl;
	b.push_back(a.row(it));
	}
	cout << "\nnew Mat\n";
	cout << b << endl;

view raw Extract the value of interest rows and copy that to new Mat.cpp hosted with ❤ by GitHub

#end code

using concate
#start code

	//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;

view raw Extract the value of interest rows and copy that to new Mat using concate.cpp hosted with ❤ by GitHub

#end code