1 Matrix4i m
= Matrix4i::Random();
2 cout
<< "Here is the matrix m:" << endl
<< m
<< endl
;
3 cout
<< "Here is m.block<2,2>(1,1):" << endl
<< m
.block
<2,2>(1,1) << endl
;
4 m
.block
<2,2>(1,1).setZero();
5 cout
<< "Now the matrix m is:" << endl
<< m
<< endl
;