Hi,

I want to use Eigen to compute a QR decomposition.

I am only interested in the triangular R matrix, but not the Q matrix.

How can I efficiently compute this R matrix (i.e. a matrix R s.t. A=QR for some orthogonal Q)

Best Blubber

The matrix Q is not explicitly computed. To get he matrix R:

R = A.householderQR().matrixQR().triangularView<Upper>();