Sue Thorne

Researcher

In 2005 I completed my DPhil at the Numerical Analysis Group, Oxford University: Iterative linear algebra for constrained optimization. My DPhil supervisor was Andy Wathen.

I spent six months at Technische Universiteit Eindhoven, The Netherlands, in 2004 as a Marie Curie Research Fellow. During this time, I was supervised by Wil Schilders.

After completing my DPhil I spent eight months at the University of Reading as a Temporary Lecturer in Applied Mathematics.

At the beginning of June 2006, I joined the Numerical Analysis Group at the Rutherford Appleton Laboratory. My research interests are primarily in numerical linear algebra, iterative methods and preconditioning.

In October 2009, I got married and changed my surname from Dollar to Thorne.

My daughter, Jessica, was born in December 2011: I was on maternity leave for the period November 2011 - September 2012. My second child is due in February 2014: I will be on maternity leave for the period February - December 2014.

Prizes

First prize in the Bill Morton Prize competion for a paper on CFD by a young research worker within 5 years of obtaining their PhD, April 2010

First prize in the Ninth Copper Mountain Conference on Iterative Methods Student Paper Competition, April 2006

Second prize in the Seventh IMACS International Symposium on Iterative Methods in Scientific Computing Student Paper Competition, May 2005

Other

In my spare time I enjoy various hobbies. These include dressmaking, knitting, cross stitch and baking.

  • Iterative methods
  • Preconditioning
  • Matrix orderings for direct methods
  • Saddle-point systems
  • Guidelines for the development of MATLAB interfaces for HSL packages (revised for MATLAB 2011a)
    [STFC Report]
    M. Arioli, I. S. Duff, J. D. Hogg and H. S. Thorne
    December 2011
  • Distributed control and constraint preconditioners
    [Computers & Fluids Article] [STFC Preprint]
    H. Sue Thorne
    Computers & Fluids, Issue 1, pp 461-466, July 2011
  • Properties of linear systems in PDE-constrained optimization. Part 2 : Neumann boundary control
    [STFC Report]
    H. S. Thorne
    April 2010
  • Optimal Solvers for PDE-Constrained Optimization
    [SISC Article] [STFC Preprint]
    T. Rees, H. S. Dollar and A. J. Wathen
    SIAM Journal on Scientific Computing, 32, pp 271–298, Feruary 2010
  • Preconditioning saddle-point systems with applications in optimization
    [SISC Article] [STFC Preprint]
    H. S. Dollar, N. I. M. Gould, M. Stoll and A. J. Wathen
    June 2008
  • A note on fast approximate minimum degree ordering for symmetric matrices with some dense rows
    [NLAA Article] [STFC Preprint]
    H. S. Dollar and J. A. Scott
    Numerical Linear Algebra with Applications, Issue 17, pp 43-55, January 2010
  • Properties of linear systems in PDE-constrained optimization. Part 1 : distributed control
    [STFC Report]
    H. S. Thorne
    August 2009
  • On Taylor series approximations for trust-region and regularized subproblems in optimization
    [STFC Report]
    H. S. Dollar
    January 2009
  • An approximate minimum degree algorithm for matrices with dense rows
    [STFC Report]
    P. R. Amestoy, H. S. Dollar, J.K. Reid and J. A. Scott
    March 2008
  • Constraint-Style Preconditioners for Regularized Saddle Point Problems
    [SIMAX Article]
    H. S. Dollar
    SIAM Journal on Matrix Analysis and Applications, 29, pp 672-684, May 2007
  • Using constraint preconditioners with regularized saddle-point problems
    [COAP Article] [STFC Preprint]
    H. S. Dollar, N. I. M. Gould, W. H. A. Schilders and A. J. Wathen
    Computational Optimization & Applications, 36, pp 249-270, April 2007
  • Approximate factorization constraint preconditioners for saddle-point matrices
    [SISC Article]
    H. S. Dollar and A. J. Wathen
    SIAM Journal on Scientific Computing, 27, pp 1555-1572, July 2006
  • Implicit-factorization preconditioning and iterative solvers for regularized saddle-point systems
    [SIMAX Article]
    H. S. Dollar, N. I. M. Gould, W. H. A. Schilders and A. J. Wathen
    SIAM Journal on Matrix Analysis and Applications, 28, pp 170-189, July 2006
  • On implicit-factorization constraint preconditioners
    [Journal Article] [STFC Preprint]
    H. S. Dollar, N. I. M. Gould and A. J. Wathen
    Nonconvex Optimization and Its Applications Volume 83, pp 61-82, 2006
  • A note on permutations for quadratic programming problems
    [Technical Report]
    H. S. Dollar
    Reading University Numerical Analysis Technical report 5/2006. 2006

Sue is the author or co-author of the following packages that are part of HSL 2013.

MC: Computations with real matrices and vectors
MC47
Sparse symmetric pattern: approximate minimum-degree ordering allowing dense rows
HSL_MC68
Symmetric sparse matrix: compute elimination orderings
HSL_MC79
Sparse matrix: maximum matching and Dulmage-Mendelsohn decomposition
MI: Iterative methods for sparse matrices
HSL_MI13
Preconditioners for saddle-point systems
HSL_MI27
Projected preconditioned conjugate gradient method for saddle-point systems
ZB: Array allocation
HSL_ZB01
Reallocate an array
RCUK