[eigen] row and col setZero in sparse matrices

[Daniel Alves Paladim <daalpa@xxxxxxxxx>]

Good evening,

I write to ask whether you have considered implementing the method setZero for rows and columns of sparse matrices. As far as I understand, we can't do,

A.col(index).setZero(); // A is sparse

This would be very useful to set a known value in a system of equations,
  b-=value*A.col(dof);
  A.col(dof).setZero();
  A.row(dof).setZero();
  A.coeffRef(dof,dof)=1.0;
  b(dof)=value;

Regards,

Daniel