3 papers
math.NA2026
An Introduction to Solving the Least-Squares Problem in Variational Data Assimilation
I. DaužickaitÄ, M. A. Freitag, S. Gürol +4
Variational data assimilation is a technique for combining measured data with dynamical models. It is a key component of Earth system state estimation and is commonly used in weath…
math.NA2025
Mixed precision sketching for least-squares problems and its application in GMRES-based iterative refinement
Erin Carson, Ieva DaužickaitÄ
Sketching-based preconditioners have been shown to accelerate the solution of dense least-squares problems with coefficient matrices having substantially more rows than columns. Th…
math.NA2025
A comparison of mixed precision iterative refinement approaches for least-squares problems
Erin Carson, Ieva DaužickaitÄ
Various approaches to iterative refinement (IR) for least-squares problems have been proposed in the literature and it may not be clear which approach is suitable for a given probl…