setting a row of a matrix to 0, in eigen

Question

kind of strange:

I'm trying to set a full row of a matrix to 0 and neither of the four obvious constructs in eigen would compile:

//U is a p by p matrix. I wanna set its last column to 0.0f
U=solved.eigenvectors();   

U.row(p-1).array()=0;              //don't compile
U.row(p-1).setZero(1,p);           //don't compile
U.row(p-1).array().setZero(p);     //don't compile
U.bottomRows(1).setZero(p);        //don't compile

I also tried other variations on these themes but neither passed the compiler

Milicent

Answer 1

You should use:

U.row(p-1).setZero();

Galen

One more question: how can I do this directly? --e.g. solved.eigenvectors().row(p-1).setZero(); – Milicent

@Milicent You cannot do this as eigenvectors() returns a constant. – Galen