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#include <Eigen/Dense>
#include <iostream>
using namespace std;
using namespace Eigen;
int main()
{
MatrixXf m(3,3), n(2,2);
m << 1,2,3,
4,5,6,
7,8,9;
// assignment through a block operation,
// block as rvalue
n = m.block(0,0,2,2);
//print n
cout << "n = " << endl << n << endl << endl;
n << 1,1,
1,1;
// block as lvalue
m.block(0,0,2,2) = n;
//print m
cout << "m = " << endl << m << endl;
}
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