NA Digest Monday, October 4, 1999 Volume 99 : Issue 39

Today's Editor:
Cleve Moler
The MathWorks, Inc.

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From: Martin Berzins <>
Date: Mon, 27 Sep 1999 20:11:03 +0100
Subject: Is Scientific Computing Part of Computer Science?

Is Scientific Computing part of Computer Science?

Every 5 years or so in the UK there is a Research Assessment Exercise
whereby the research of all University departments is examined.
The definition of Computer Science for the forthcoming exercise makes
no mention of Scientific Computing. I'd be interested in the reaction
of the NA-digest community to this.


From: Ilse Ipsen <>
Date: Wed, 29 Sep 1999 15:51:54 -0400
Subject: Difference Between 1x1 Matrices and Scalars

There can be a difference between 1x1 matrices and scalars.

Consider the matrix product A*B*C where

A = [1 1] B = [1] C=[1]
[1] [2]

The product A*B*C is not defined because B*C is not defined.
Nevertheless MATLAB 5.3 computes the answer [2]

presumably because it associates (A*B)*C. In this case A*B
happens to be a scalar but should be treated as a 1x1 matrix.

Is this something to worry about?

Ilse Ipsen


From: Jonathan Owen <>
Date: Tue, 28 Sep 1999 07:37:25 -0500 (CDT)
Subject: GIDEN-2.0, Network Optimization Software

A beta release of the new GIDEN-2.0 software environment is
now available through the GIDEN web site:

GIDEN is interactive software environment designed to
facilitate the visualization of network optimization
problems, solutions, and algorithms. Features of GIDEN
include the following:

- a graphical interface for building and
modifying networks

- facilities for algorithm animation

- an expandable toolkit of animated algorithm
implementations ("solvers")

- a library of network-related data structures

- platform independence (using Java)

The new version of GIDEN is available only as a Java-1.1
application. The software can be used on any Java-enabled
computing platform with an available Java virtual machine
(version 1.1.7 or higher). The GIDEN-2.0 download page
provides installers for several platforms, including an
installer for Win9x/NT that contains an appropriate Java
virtual machine.

See the GIDEN web site ("") for more
information on the project. Please direct any questions or
comments via email to "".

Jonathan H. Owen
Assistant Research Professor
Industrial Engineering and Management Sciences
Northwestern University
2145 Sheridan Road
Evanston, IL 60208-3119


From: Xiaoye Li <>
Date: Wed, 29 Sep 1999 14:26:19 -0700
Subject: New SuperLU Release

New SuperLU release

SuperLU is a general purpose library for the direct solution of
large, sparse, nonsymmetric systems of linear equations on high
performance machines. There are 3 versions:
SuperLU - serial
SuperLU_MT - parallel, for shared memory machines
SuperLU_DIST - parallel, for distributed memory machines

The distributed memory version, SuperLU_DIST, is new in this release.
It uses MPI for interprocess communication. "Static pivoting"
techniques are used to combine the numerical stability
of partial pivoting with the scalability of not pivoting,
The pre-ordering code for large diagonal elements was developed
by I. Duff and J. Koster.

In addition, we have also updated the serial SuperLU and
multi-threaded SuperLU_MT libraries. These updates include
bug fixes, modified MEX files to work with Matlab 5.x, and
adding the approximate minimum degree column ordering code
(COLAMD) developed by T. Davis, J. Gilbert, S. Larimore and E. Ng.

All three libraries, and a new User Guide, can be obtained at

This is joint work of James Demmel ( at
UC Berkeley, John Gilbert ( at Xerox PARC and
Xiaoye S. Li ( at Lawrence Berkeley National Lab.
The project has been funded by DOE, NSF and DARPA.


From: Jean-David Benamou <>
Date: Thu, 30 Sep 1999 09:50:26 +0200
Subject: MATLAB GUI for Ray Tracing

I have written Matlab GUI called GROLAB (Geometric Rays Optical Lab).
It is designed to provide easy interactive access to 2-D point source
optic ray tracing. The user can import models and also reshape them
to a limited extent. The source position and the aperture angle are
can also be adjusted in the GUI. I think it can used for education
or simply for fun. A quick introduction to the software can be found
in the file groREADME. Feed Back and bug reports are welcome ...

It can be downloaded from my web page on Geometric Optics .


From: Sergei Gololobov <>
Date: Wed, 29 Sep 1999 13:51:37 +0200
Subject: Seminar Days at Catholic University of Nijmegen


Supported by the Copernicus KIT project "High performance computing
in Geosciences" and by the INTAS-RFBR 95-0098 project "Development of
high performance numerical methods for solving stiff multiparameter
boundary value problems".

Tuesday 19.10.99

O.Axelsson, (title to be given later)
A.Padiy, On the two-level Newton method
J.Karotson, On the gradient method in Sobolev space for
quasilinear elliptic problems
S.Margenov, On nonlinear problems arising in soil mechanics
B.Polman, The augmented matrix preconditioning method
for ill-conditioned matrices
E. van Veenendaal, Numerical simulation of solution
crystal growth and solute diffusion
R.Huiskes, Computer simulation of bone remodeling

Wednesday 20.10.99

R.Blaheta, Variable displacement decomposition preconditioning
R.Kohut, Local refinement algorithms -- performance aspects
B. van Rietbergen, Computational strategies for iterative
solutions of very large FEM applications
employing voxel data: application to
trabecular bone
I.Kaporin, Minimum residual and adaptive refinement FE methods
for first order reformulations of PDE's.
M.Nikolova, On adaptive refinement methods for convection-diffusion
L.Vijfvinkel, Error indicators for adaptive refinement:
comparison between a residual-based and a
multiplier-based estimator
M.Larin, An optimal multilevel method for computing the
smallest eigenpair


From: Issam Moghrabi <>
Date: Thu, 30 Sep 1999 08:07:24 +0200
Subject: Conference in Lebanon on Research Trends in Science and Technology

International Conference on Research Trends in Science and
RTST 2000
Beirut and Byblos, Lebanon
March 6 to 8, 2000

This conference is a forum for scientists and engineers to
present their research, ideas, developments and applications in
basic sciences and engineering. It will be held at the Lebanese
American University on two campuses (Beirut and Byblos) during
the year in which LAU celebrates its seventy fifth anniversary.
The organization of the conference by LAU is a tribute to science
and technology and an outlook on the future of LAU in the third

Chemical Synthesis
Molecular Recognition
Quantum Mechanics
Computational Mechanics
Material Science
Modeling and Simulation
Signal and Image Processing
Smart Engineering
Applied Symbolic Programming
Numerical Methods

A. Kabbani (Chair)
R. Ghajar (Co-Chair)
I. Moghrabi (Secretary)
M. Hamdan
M. Tabbara
A.N. Kassar

All correspondence should be sent to:
Dr. Issam Moghrabi
Natural Science Division
Lebanese American University
P.O. Box 13-5053
Beirut, Lebanon


Professor Pulickel Ajayan, Rensselaer Polytechnic Institute, USA
Professor Dennis Brewer, University of Arkansas, USA
Professor George Newkome, University of South Florida, USA
Professor James Sorem, University of Tulsa, USA
Professor Frank Wazzan, University of California - LA, USA

Submission of manuscripts: December 31, 1999
Notification of acceptance: January 31, 2000


From: Arieh Iserles <>
Date: Thu, 30 Sep 99 15:40:08 BST
Subject: Durham Symposium on Geometric Integration

LMS DURHAM SYMPOSIUM on "Geometric integration"
13th - 23rd July 2000 University of Durham, Durham, UK.

London Mathematical Society will be hosting a ten-day symposium on
geometric integration this summer at the University of Durham. The
main themes are
1.Discretization of differential equations in Lie groups and
homogeneous manifolds;
2.Recovery of Lie symmetries under discretization and applications to
partial differential equations
3.Computation of Lie symmetries by means of symbolic analysis
4.Asymptotics of solutions of partial differential equations;
5.Numerical methods and testing computer codes;
6.Symplectic and multisymplectic methods for Hamiltonian differential
The format will consist of instructional lectures in the mornings by
experts and talks during the afternoons, with plenty of time reserved
for interaction, collaboration and self-study.

Members of the organising committee are Chris Budd (Bath), Peter
Clarkson (Kent), Des Higham (Strathclyde), Arieh Iserles (Cambridge),
Benedict Leimkuhler (Leicester), Elizabeth Mansfield (Kent), Sebastian
Reich (Surrey) and Ian Roulstone (Met Office). A (fairly incomplete)
home page of the symposium, with more detail about scientific contents
and a tentative list of participants, can be found at

Participation in a Durham Symposium is mainly by invitation, but we
are willing to consider a small number of applicants. Please email your
application with supporting material to before 15th


From: Max Gunzburger <>
Date: Mon, 27 Sep 1999 16:00:25 -0500
Subject: Faculty Positions at Iowa State University

Department of Mathematics

The department seeks applicants, pending funding, for
several tenure track positions to begin in August, 2000.
The positions are expected to be at the assistant professor
level, but exceptional applicants for a higher rank may be
considered. An excellent record in research and teaching is
required, and experience beyond the Ph.D. is desirable.

The positions are targeted on the following areas.
Computational molecular biology/bioinformatics
Numerical analysis and scientific computing
Discrete mathematics
Applied mathematics
In all cases, we are interested in hiring mathematicians
whose research programs are complementary to the existing
strengths in the department and who can interact with
current faculty in the department as well as with the
faculty in other units of the university. Details about
each position may be found at the web site

An applicant must indicate which position(s) they are
applying for and submit a vita and a brief statement
describing their research accomplishments and plans. They
must also arrange for the submission of four letters of
recommendation, one of which must address the applicant's
teaching ability and experience. Applicants for junior
positions should also submit their graduate transcripts.
All application materials should be sent to: Max Gunzburger,
Department of Mathematics, Iowa State University, Ames IA
50011-2064. Applicants whose completed applications are
received by December 15, 1999 are assured of receiving full

Iowa State University strongly encourages women and
members of underepresented groups to apply.


From: Gilles Villard <>
Date: Wed, 29 Sep 1999 17:34:09 +0200
Subject: Faculty Position at UJF / IMAG Grenoble

L'Universit=E9 Joseph Fourier and the computer algebra group
within the laboratory LMC-IMAG in Grenoble France,
have an opening for a full professor position starting at
fall 2000. Outstanding scientists who have an interest in the
topics listed below in the detailed description of the position,
are invited to apply.
The candidate must be "qualifi=E9" by the french CNU (National
Council of the Universities), the deadline to apply to this
qualification is nov 10, 1999.

Title: Computer algebra (software, algorithmic and applications)
Sections: 26/27 (Applied Mathematics & Computer Science)

The candidate must have done and supervised a large part of his
research in the domain of computer algebra: software and computer
algebra systems, algorithmic, applications of computer algebra.
He must also have knowledges either in computer science (languages
and software in computer algebra, theoretical computer science),
either in modelling (automatic, geometry, ..., numerical analysis,
differential and/or partial differential equations).

The candidate will belong to the computer algebra group of
the LMC-IMAG laboratory. He will participate to the development of
current projects (differential and differential algebraic equations,
linear algebra and software development) and to the opening of
the team towards domains of modelling at the interface between
computer science, applied mathematics and applied topics such as
automatic or geometry.

With his knowledges, the candidate will be able to manage the
different aspects of computer algebra teachings. More generally,
he must be able to answer to the basic mathematics or computer
science teaching needs.


From: Bill Hager <>
Date: Thu, 30 Sep 1999 19:33:59 -0400 (EDT)
Subject: Faculty Position at University of Florida

The University of Florida Mathematics Department invites applications
for a tenure track assistant professor position in Applied Mathematics/PDE.
Priority is given to candidates who can interact with existing groups
in the department. Appointments commence in August 2000. Applicants
must show strong research promise and are expected to excel in teaching
as well. Applicants should forward curriculum vitae and a list of publications

Chair of Search Committee
Department of Mathematics
358 Little Hall
University of Florida
Gainesville, FL 32611 - 8105

Applicants should ask referees to send three letters of recommendation
directly to the address above. Completed applications are due by December
13, 1999.

The Department welcomes applications from women and minority candidates.
The University of Florida is an EEO/AA institution. Anyone requiring
special assistance in completing the application should contact the search
committee chairperson.

For more information about the department, see


From: Stu Naegele <>
Date: Mon, 27 Sep 1999 10:10:37 -0600
Subject: Postdoctoral Position at CU Boulder


Applications are invited for two postdoctoral fellowships to begin either
Spring or Fall 2000. The fellowships are part of a National Science
Foundation grant the Department has been awarded for Vertical Integration
of Research and Education (VIGRE) in applied mathematics. This award will
support three-year appointments for four postdoctoral fellows. The fellows
will join a "tetrahedral" multi-level research group-composed of faculty,
postdoctoral fellows, graduate trainees and undergraduates-in one of the
following areas (faculty are listed in parentheses):
Multilevel computation (T. Manteuffel, S. McCormick)
Fast algorithms (G. Beylkin, B. Fornberg, K. Julien)
An innovative attribute of this grant is the dual participation in research
and teaching. Each fellow will also be involved in teaching and learning
programs in the Department and is expected to teach one course per
semester. Fellowships are available only to U.S. citizens or permanent
residents. The University of Colorado at Boulder is committed to diversity
and equality in education and employment.
Further information can be found on the Department's web page:
Applicants should send a letter of application, a current curriculum vitae,
a statement of research interests, an AMS Standard Cover Sheet (see and three letters of
recommendation (sent directly) to:
Postdoctoral Fellow Search
Department of Applied Mathematics
Campus Box 526
University of Colorado
Boulder, CO 80309
Review of applications will begin December 1, 1999 and will continue until
the positions are filled.


From: George Anastassiou <>
Date: Wed, 29 Sep 1999 14:19:47 -600
Subject: Contents, Journal of Computational Analysis and Applications

Table of Contents JoCAAA Vol.1,No.2,April 1999

1)A Learning Algorithm for the Control of Continuous Action Set-Point
Regulator Systems,A.O.Esogbue and W.E.Hearnes,II,121

2)A General Sampling Theorem Associated with Differential Operators,
A.G.Garcia and M.A.Hernandez-Medina,147

3)Fundamental Solutions of Linear Differential Equations in the Sense
of Mnemofunctions,N.Y.Radyno and V.G.Papanicolaou,163

4)Univariate Geometric Stable Laws,T.J.Kozubowski and S.T.Rachev,177

5)Fast Iterative Methods for Solving of Boundary Nonlinear Integral
Equations with Singularity,D.Rostami Varnos Fadrani and

Table of Contents JoCAAA Vol.1,No.3,July 1999

1)Dedication to Professor P.L.Butzer,235


3)Simultaneous Polynomial Approximation in the Weighted Chebyshev
Norm,T.Kilgore and M.Tasche,239

4)Interpolation on Sparse Grids and Tensor Products of Nikol'skij-
Besov Spaces,W.Sickel and F.Sprengel,263

5)General Theory of Global Smoothness Preservation by Singular
Integrals,Univariate Case,G.A.Anastassiou and S.G.Gal,289.


End of NA Digest