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- Luz M. DeAlba, Irvin Roy Hentzel, +5 authors Kevin N. Vander Meulen
- 2006

A sign pattern Z (a matrix whose entries are elements of {+,−, 0}) is spectrally arbitrary if for any selfconjugate spectrum there is a real matrix with sign pattern Z having the given spectrum.… (More)

- Brian G Greenfield, Pamela A. Catlin, Paul Coats, Erin H. Green, Judith J. McDonald, C. Rebecca North
- The Journal of orthopaedic and sports physical…
- 1995

Assessment of posture is an integral component of patient evaluation with shoulder overuse injuries. However, the professional literature contains relatively few studies that have assessed the… (More)

- SARAH CARNOCHAN NAQVI, Judith J. McDonald
- 2008

In this paper it is shown that an eventually nonnegative matrix A, for which the index of zero is less than or equal to one, exhibits many of the same combinatorial properties as a nonnegative… (More)

- Thomas Britz, Judith J. McDonald, D. D. Olesky, Pauline van den Driessche
- SIAM J. Matrix Analysis Applications
- 2004

An n × n sign pattern A is spectrally arbitrary if given any self-conjugate spectrum there exists a matrix realization of A with that spectrum. If replacing any nonzero entry (or entries) of A by… (More)

An M-matrix is a matrix that can be expressed as αI − P, where P is entry wise nonnegative and α ≥ ρ(P ). It is well known that the inverse of a nonsingular irreducible M-matrix is positive. In this… (More)

Motivated by a differential continuous-time switching model for gene and neural networks, we investigate matrix theoretic problems regarding the relative location and topology of the dominant… (More)

In this paper, we give necessary and sufficient conditions for a set of Jordan blocks to correspond to the peripheral spectrum of a nonnegative matrix. For each eigenvalue, λ, the λ-level… (More)

- SARAH CARNOCHAN NAQVI, Judith J. McDonald
- 2002

In this paper it is shown that an eventually nonnegative matrix A whose index of zero is less than or equal to one, exhibits many of the same combinatorial properties as a nonnegative matrix. In… (More)

- Angela Vasquez, Yolanda Valdez, +5 authors V. H. Contreras Gutiérrez
- Journal of clinical microbiology
- 1996

Resistance of Helicobacter pylori to metronidazole often causes failure of commonly used combination drug treatment regimens. We determined the MICs of metronidazole and clarithromycin against 18 H.… (More)

- Judith J. McDonald, Michael Neumann, H. Schneider, Michael J. Tsatsomeros
- SIAM J. Matrix Analysis Applications
- 1996

In this paper we characterize all nonnegative matrices whose inverses are M{matrices with unipathic digraphs. A digraph is called unipathic if there is at most one simple path from any vertex j to… (More)