### Today's Editor:

- Cleve Moler
- The MathWorks, Inc.
- moler@mathworks.com

- Teaching Symbolic Computations
- MATLAB Primer
- Garcia's Request on Air Pollution
- Address Changes for Jesse Barlow and Hongyuan Zha
- Scottish Computational Mathematics Symposium 1993
- Workshop on ODE's Arising in Chemistry

-------------------------------------------------------

From: John Mathews <MATHEWS@FULLERTON.EDU>

Date: 10 Aug 1993 07:00:06 -0800 (PST)

**Subject: Teaching Symbolic Computations**

Teaching Symbolic Computations

I would appreciate feedback about using computer algebra software (CAS),

in teaching Numerical Analysis to undergraduate students.

Is there an interest in teaching CAS in Numerical Analysis?

Should there now be a component on using software such as MAPLE, Derive,

MACSYMA or Mathematica in the student computer laboratory exercises?

Should students be taught to use CAS to derive some of the formulas involved

in numerical analysis? (Such as interpolation, integration...)

Should any computations be done in rational arithmetic compared to decimals?

If you have had experience using CAS or are interested in it,

I would appreciate your correspondence.

Best Regards,

John Mathews

Dept. of Mathematics

Calif. State Univ. Fullerton

Fullerton, CA 92631

e-mail mathews@fullerton.edu

------------------------------

From: Kermit Sigmon <sigmon@math.ufl.edu>

Date: Tue, 10 Aug 93 14:46:23 EDT

**Subject: MATLAB Primer**

MATLAB Primer

This is to remind users of the MATLAB Primer that the latest

version is available via anonymous ftp from:

math.ufl.edu in the directory pub/matlab

The following files are currently available:

primer.tex Plain TeX source of the second edition

primer.ps PostScript file for the second edition

primersp.tex Plain TeX source of the Spanish version of the 2nd ed.

primersp.ps PostScript file for the Spanish version of the 2nd ed.

You are advised to download the appropriate file since it contains

a new copyright clearance statement as well as a few minor revisions

to the one you probably now have. In fact, you are advised to

download anew the latest version each term since minor improvements

and corrections may have been made.

While the second edition of the Primer is based primarily on version

3.5 of MATLAB, it is compatible with version 4.0 with the fundamental

differences noted. An edition of the Primer based on version 4.0 is,

however, under development. You will be informed here when is becomes

available.

As many of you know, the MATLAB Primer was written to help students

begin to use MATLAB. It is intended to serve as an introduction to

and *not* a manual for MATLAB. While its primary purpose is for use

in courses which require use of MATLAB, it could, of course, serve

as an introduction to MATLAB for others. It is intended to be

distributed via a local copy center.

Kermit Sigmon Department of Mathematics

sigmon@math.ufl.edu University of Florida

------------------------------

From: Zahari Zlate v<luzz@sun2.dmu.min.dk>

Date: Wed, 11 Aug 93 15:23:13 +0200

**Subject: Garcia's Request on Air Pollution**

In the last issue of the NA Digest, Gustavo Montero Garcia

sent a request about finite element discretization of air

pollution models (together with some other finite element

applications). We are also interested in these topics.

Therefore we shall be very grateful if all answers sent

to Garcia are also forwarded to us. Our e-mail addreses

are

bneta@moon.math.nps.navy.mil (Beny Neta)

and

luzz@sun2.dmu.min.dk (Zahari Zlatev)

Thank you very much in advance.

------------------------------

From: Jesse Barlow <barlow@cse.psu.edu>

Date: Fri, 13 Aug 1993 10:01:20 -0400

**Subject: Address Changes for Jesse Barlow and Hongyuan Zha**

Address changes for Jesse Barlow and Hongyuan Zha.

The computer science department at Penn State has been combined

with the computer engineering program and moved to a new building.

The new addresses are

Department of Computer Science and Enginnering

220 Pond Laboratory

The Pennsylvania State University

University Park, PA 16802-6106

FAX: 814-865-3176

Dept. Phone: 814-865-9505

Office addresses and phones

Jesse Barlow

312 Pond Lab

814-863-1705

barlow@cse.psu.edu

Hongyuan Zha

307 Pond Lab

814-863-0608

zha@cse.psu.edu

The phone numbers are unchanged.

Jesse Barlow.

------------------------------

From: Dugald Duncan <dugald%cara.ma.hw.ac.uk@ib.rl.ac.uk>

Date: Wed, 11 Aug 93 09:21:04 +0100 (BST)

**Subject: Scottish Computational Mathematics Symposium 1993**

SECOND ANNOUNCEMENT + CALL FOR POSTERS

SCOTTISH COMPUTATIONAL MATHEMATICS SYMPOSIUM 1993

10am-5pm Monday 13th September

Hume Tower, University of Edinburgh, Scotland.

PROGRAMME

* V. Stanley (NAG Ltd.)

Introduction to the AXIOM computer algebra system.

(AXIOM will be demonstrated during the breaks.)

* J.C. Eilbeck (Heriot-Watt University)

Quantum mechanics, Mathematica and the eigenvalues of

tridiagonal matrices.

* A.J. Wathen (University of Bristol)

The convergence of preconditioned Krylov--subspace iterations

for the Stokes and Navier-Stokes equations.

* K.W. Morton (University of Oxford)

Cell vertex methods for steady systems of conservation laws.

* D.J. Higham (University of Dundee)

Global errors in numerical time-stepping.

POSTERS: Space for posters is limited so please contact the organisers

at the address below as soon as possible (and certainly before the end

of August) if you intend to submit one.

SCOTTISH COMPUTATIONAL MATHEMATICS SYPOSIUM: This is the second meeting

in the series organised by D.B. Duncan (Heriot-Watt University) and

D.M. Sloan (University of Strathclyde) with the aim of bringing

together mathematicians and others who develop and/or use computer

algorithms to solve mathematical problems. The meetings are open to

everyone interested and this one is supported financially by the London

Mathematical Society.

REGISTRATION & INFORMATION: To register, send a cheque for 15 pounds

payable to Heriot-Watt University and include your address so that we

can contact you. The fee includes tea & coffee breaks and lunch. If

possible, please register before the end of August so that we can

arrange the catering. To register or to obtain further information

please contact:

Dr. Dugald Duncan, Department of Mathematics,

Heriot-Watt University, Edinburgh, EH14 4AS.

e-mail: dugald@cara.ma.hw.ac.uk.

------------------------------

From: Zahari Zlatev <luzz@sun2.dmu.min.dk>

Date: Wed, 11 Aug 93 14:37:35 +0200

**Subject: Workshop on ODE's Arising in Chemistry**

Here is the announcement for an informal workshop concerning some

important topics that are of interest for air pollution modellists,

chemists and numerical analysts working in the field of numerical

solution of stiff ODE's. The National Environmental Research

Institute, where the workshop will take place, is located

not far from Copenhagen.

Best regards,

Zahari Zlatev

WORKSHOP ON THE NUMERICAL TREATMENT

OF THE CHEMICAL PART

OF LARGE AIR POLLUTION MODELS

Date: November 19 1993

Place: National Environmental Research Institute

Frederiksborgvej 399, DK-4000 Roskilde, Denmark

The chemical reactions are an important part of any air pollution model.

The reliability of the concentrations calculated by the model depends strongly

on the accuracy of the numerical methods used in the treatment of the chemical

reactions. The requirement for accurate methods is absolutely necessary, but

unfortunately not sufficient. The systems of ordinary differential equations

(ODE's) that appear when the chemical reactions are described mathematically

are normally very stiff and very badly scaled. Therefore not only should the

numerical methods be accurate, but it should also be possible to carry out the

integration by using large time-steps. Finally, the discretization of the air

pollution models leads to huge computational problems; it is not uncommon that

millions of equations have to be treated numerically during many time-steps.

This fact implies a third requirement: the numerical methods should be

suitable for high-speed computers. Thus, the modern large air pollution models

can be treated numerically only if accurate and fast numerical methods that

perform well on parallel and vector machines are used in the chemical part.

The main purpose with this workshop is to bring together physisists

working with large air pollution models and specialists in solving stiff

ODE's. The hope is that in the discussions some promising classes of

numerical methods for the chemical parts of the existing large air pollution

models will be selected and further experiments with these methods will be

planned.

A limited number of papers will be selected for the workshop. If you want

to present a paper and/or to attend the workshop contact (no later than

October 25 1993):

Zahari Zlatev

e-mail: luzz@sun2.dmu.min.dk,

fax: +45 4630 1212,

phone: +45 4530 1149

There will be no conference fee, but the number of participants will be

limited (to no more than 30, and preferrably less than 30). We can assist you

in the reservation of hotels.

A tentative program with the talks at the workshop will be sent to the

participants in the beginning of November 1993.

------------------------------

End of NA Digest

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