Roland Wittmann

Learn More
(2014) 'Block fusion on dynamically adaptive spacetree grids for shallow water waves.', Parallel processing letters., 24 (3). p. 1441006. Use policy The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes(More)
In this paper we present a new stable algorithm for the parallel QR-decomposition of " tall and skinny " matrices. The algorithm has been developed for the dense symmetric eigensolver ELPA, whereat the QR-decomposition of tall and skinny matrices represents an important substep. Our new approach is based on the fast but unstable CholeskyQR algorithm [1]. We(More)
  • 1