How to compute basis of nullspace with Eigen library?

Question

How to compute basis of nullspace of a matrix with Eigen library?

I tried to find explicit function name to compute null basis and also

Answer 1

You can get a basis of the null space using Eigen::FullPivLU::kernel() method:

FullPivLU lu(A);
MatrixXd A_null_space = lu.kernel();