### Today's Editor:

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

- Multiprecision Computation Translator
- Multivariate Optimization
- SIAM Meeting Advance Registration Deadlines
- Position at University of Vienna
- Contents: Journal of Supercomputer Applications

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

From: David Bailey <dbailey@nas.nasa.gov>

Date: Tue, 21 Apr 92 10:46:38 -0700

**Subject: Multiprecision Computation Translator**

Some of you may be aware of a multiprecision computation package and a

multiprecision Fortran translator that I have developed during the

past year or two. I am now pleased to announce that this software has

been approved by NASA Ames for unlimited international distribution,

at no cost. A brief description of this software is as follows:

The first package contains approximately 85 Fortran subroutines that

perform a variety of arithmetic operations and transcendental

functions. The basic arithmetic routines are very efficient, and for

extra high levels of precision (about about 1000 digits), some

additional routines are available that employ advanced algorithms,

such FFT-based multiplication and the Borwein transcendental

algorithms, for additional speedup. On some problems these routines

are over 200 times faster than certain other multiprecision tools.

However, as with other such packages, manually converting a program to

use these routines is a tedious and error-prone process. To

facilitate such conversions, I have now developed a multiprecision

translator for Fortran programs. By means of source directives

(special comments) placed in a standard Fortran-77 program, the user

declares the precision level and specifies which variables in each

subprogram are to be treated as multiprecision. The translator

program reads this source program and outputs a program with the

appropriate multiprecision subroutine calls, which can then be linked

with the multiprecision package and executed.

This translator program supports multiprecision integer, real and

complex datatypes. The required array space for multiprecision data

types is automatically allocated. In the evaluation of computational

expressions, all of the usual conventions for operator precedence and

mixed mode operations are upheld. Furthermore, most of the Fortran-77

intrinsics, such as ABS, MOD, NINT, COS, EXP are supported and produce

true multiprecision values.

Both the multiprecision package and translator are written in highly

portable Fortran-77 and have been successfully implemented on a

variety of systems, ranging from parallel supercomputers to

workstations.

If anyone is interested in obtaining this software, plus the

accompanying documentation, please send me a note. I eventually

intend to place this software on public media such as netlib, but for

the time being I prefer to keep a list of users, so that any bug fixes

or enhancements can be promptly distributed.

David H. Bailey

NASA Ames Research Center

dbailey@nas.nasa.gov

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

From: Eildert Groeneveld <eg@itt-mta-gw2arpa.fal-braunschweig.dbp.de>

Date: 23 Apr 92 14:42

**Subject: Multivariate Optimization**

We are performing multivariate (dimensions of 60 and more) numerical

optimization on functions which are very costly to evaluate: each

evaluation might take 30 minutes CPU time or more. So far we have used

some Downhill Simplex and QuasiNewton procedures. However, there may be

recent algorithms out there that I am not aware of. Thus, I am looking

for an optimization algorithm that meets the following conditions:

1. very efficient in regard to number of function evaluations

2. able to recover from non smooth function values (indicating a set

of function parameters that are not defined)

3. constrained or unconstrained optimization.

Efficiency is of great importance, but also robustness. Any pointers would be

greatly appreciatated.

Address: Eildert Groeneveld

Institute of Animal Husbandry

and Animal Behaviour

Federal Agricultural Research Centre (FAL)

W-3057 Neustadt 1

Mariensee

Hoeltystr. 10

Germany

Tel : 05034 871 155

Fax : 05034 871 143

e-mail : groeneveld@tierzucht-mariensee.fal-braunschweig.dbp.de

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

From: Tina Flores <flores@siam.org>

Date: Tue, 21 Apr 92 15:15:20 EST

**Subject: SIAM Meeting Advance Registration Deadlines**

Just a friendly reminder.....

Deadlines for advance registration:

Fourth SIAM Conference on Optimization ------ May 4, 1992

Sixth SIAM Conference on Discrete Mathematics-- June 1, 1992

For your convenience, you can register either by phone, FAX

or e-mail. Call 215-382-9800. FAX 215-386-7999. E-mail

meetings@siam.org

VISA, MC and AE credit cards are welcomed. Contact SIAM now

and furnish the following information: registrant's

name, affiliation and address; name of conference; SIAM

member or non-member; type of credit card, number and

expiration date.

We look forward to your presence at these conferences.

Thank you.

SIAM

Society for Industrial and Applied Mathematics

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

From: Herbert Muthsam <A8131DAA%AWIUNI11.BITNET@AEARN.EDVZ.UNI-Linz.AC.AT>

Date: Wed, 22 Apr 92 09:12:20 MEZ

**Subject: Position at University of Vienna**

University of Vienna/AUSTRIA

Institute of Mathematics

The Institute of Mathematics invites applications for a newly created

tenured full professorship in computational mathematics.

Requirements include successfull scientific activity in the development

resp. analysis of computer-aided solution methods for mathematical,

scientific or technological problems. The successful candidate will be

ready to enhance pertinent teaching activities and cooperate with

neighbouring scientific disciplines at the university. Knowledge of the

German language is necessary.

Candidates should send applications (including curriculum vitae,

publication list, etc.), to: University of Vienna, FN Dekanat, Karl

Lueger-Ring 1, A-1010 Vienna, Austria. Applications should arrive

before June 15, 1992.

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

From: Jack Dongarra <dongarra@cs.utk.edu>

Date: Thu, 23 Apr 92 16:45:29 -0400

**Subject: Contents: Journal of Supercomputer Applications**

International Journal of Supercomputer Applications

Table of Contents Volume 6.2 summer 1992

EDITORIAL Page 127

The Frankenstein Project: Building a Man in the

Machine and the Arrival of the Computational Physician

M. Witten

PAPERS

Protein Sequence and Structure Comparison on Page 138

Massively Parallel Computers

by R. Jones Thinking Machines Corporation

Parallel Computation for Medicine and Biology: Page 147

Applications of Linda at Yale University

D.F. Sittig, M.A. Shifman, P. Nadkarni, P.L. Miller

Yale University

Computational Methods for Bone Mechanics Studies Page 164

R.T. Hart, Z.M. Oden, S.W. Parrish, *D.B. Burr

Tulane University, *Indiana University

Solid Modeling on a Massively Parallel Processor Page 175

By D. Strip, M. Karasick Sandia National Laboratories,

IBM T.J. Watson Research Center

History Matching for Multiphase Reservoir Models Page 193

on Shared Memory Supercomputers

by J. Zhu, Y.M Chen Mississippi State University

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

End of NA Digest

**************************

-------