use .block() with complex matrix eigen lib

Question

when i would like to use block() with MatrixXcd In and levyhorni:

levyhorni=In.block(0,0,h/2,w/2);

is correct or for every part of complex is correct?

levyhorni.real()=In.real().block(0,0,h/2,w/2);

and same for .imag();

Answer 1

Yes the first statement is correct. You can even simplify it to:

levyhorni = In.topLeftCorner(h/2,w/2);