Wim Vanroose @vanroose.bsky.social · 18/11/2025Automatic blinds at the National Gallery in Edinburgh are an art work itself. 1142
Wim Vanroose @vanroose.bsky.social · 08/08/2025SISC published our paper on RESQPASS where subspaces are combined with constrained optimization to solver the Bounded Variable least squares problem. After a few iterations, where the bounds are discovered, the method behaves as a Krylov subspace. epubs.siam.org/doi/abs/10.1... 030
Wim Vanroose @vanroose.bsky.social · 06/08/2025Washington - Judiciary square. There is something broken here. 010
Wim Vanroose @vanroose.bsky.social · 04/08/2025these masses next to this building in Santiago de Chile are they earthquake dampers? 110
Wim Vanroose @vanroose.bsky.social · 21/06/2025Well Stella is also one of the cheapest beers here in Belgium. 24 bottle for 15euro. I guess it is more expensive abroad 000
Wim Vanroose @vanroose.bsky.social · 13/06/2025adding updating of the factorisation and hot-starting results in the following algorithm 000
Wim Vanroose @vanroose.bsky.social · 13/06/2025A remarkable thing is that these residuals are orthogonal as soon as you have a feasible solution to the KKT conditions. This results a subspace spanned by the residuals that are orthogonal. 100
Wim Vanroose @vanroose.bsky.social · 13/06/2025This gives an algorithms like this. Note that we use a generalised residual, where Lagrange multipliers modify locally the classical residual 100
Wim Vanroose @vanroose.bsky.social · 13/06/2025Krylov methods cannot deal with bounds on the variable. But if you solve a small QP problem instead of a small tridiagonal or small least squares problem, you can find the solutions within the subspace 100
Wim Vanroose @vanroose.bsky.social · 13/06/2025Grateful to Householder committee for the opportunity to explain the ResQPASS algorithm at Householder symposium XXII at Cornell University --- Ithaca, NY USA. The paper, co-auther with Bas Symoens ( arxiv.org/abs/2302.13616 ), has been accepted for publication in SISC. 131
Wim Vanroose @vanroose.bsky.social · 06/12/2024ResQPASS in the outer loop is very similar to GMRES or LSQR. But it can also deal with bounds on the variables, in contrast to these traditional Krylov subspace methods arxiv.org/abs/2302.13616 #RESQPASS 010
Wim Vanroose @vanroose.bsky.social · 19/11/2024The ResQPASS algorithm creates a subspace similar to Krylov subspaces. But is more general since it can deal with bounds on the variables. 140
