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- Iain S. Duff, Roger G. Grimes, John G. Lewis
- ACM Trans. Math. Softw.
- 1982

We describe the Harwell-Boeing sparse matrix collection, a set of standard test matrices for sparse matrix problems. Our test set comprises problems in linear systems, least squares, and eigenvalueâ€¦ (More)

An \industrial strength" algorithm for solving sparse symmetric generalized eigenproblems is described. The algorithm has its foundations in known techniques in solving sparse symmetricâ€¦ (More)

- Cleve Ashcraft, Roger G. Grimes, John G. Lewis
- SIAM J. Matrix Analysis Applications
- 1998

- Ari S Levine, Orna Zagoory-Sharon, Ruth Feldman, John G. Lewis, Aron Weller
- Physiology & behavior
- 2007

The steroid cortisol is an extensively studied and important variable in developmental and other behavioral studies. Cortisol has been assayed by various methods using a range of substrates includingâ€¦ (More)

- Lucio Bonato, Gregory D. Edgecombe, +4 authors Marzio Zapparoli
- ZooKeys
- 2010

A common terminology for the external morphological characters of centipedes (Chilopoda) is proposed. Terms are selected from the alternatives used in the English literature, preferring those mostâ€¦ (More)

The critical bottlenecks in the implementation of the conjugate gradient algorithm on distributed memory computers are the communication requirements of the sparse matrix-vector multiply and of theâ€¦ (More)

- Caroline Jung, Jui T Ho, +5 authors Warrick J Inder
- The Journal of clinical endocrinology andâ€¦
- 2011

CONTEXT
There is a paucity of longitudinal data on plasma and urinary cortisol levels during pregnancy using modern assays. Furthermore, conflicting data exist as to the effect of the low-dose oralâ€¦ (More)

- John G. Lewis, Leonard Maler
- Journal of neurophysiology
- 2002

The dynamics of neuronal feedback pathways are generally not well understood. This is due to the complexity arising from the combined dynamics of closed-loop feedback systems and the synapticâ€¦ (More)

We describe an algorithm to compute a rank revealing sparse QR factorization. We augment a basic sparse multifrontal QR factoriza-tion with an incremental condition estimator to provide an estimateâ€¦ (More)

- John G. Lewis, Len Maler
- The Journal of neuroscience : the officialâ€¦
- 2001

Weakly electric fish use an electric sense to navigate and capture prey in the dark. Objects in the surroundings of the fish produce distortions in their self-generated electric field; theseâ€¦ (More)