NA Digest Sunday, February 16, 1992 Volume 92 : Issue 7 Today's Editor: Cleve Moler The MathWorks, Inc. moler@mathworks.com Today's Topics: Congratulations to Bill Gear and Dick Tapia A Reception at the IMA Workshop Help Needed with SPARSE1.3 Whittaker Confluent Hypergeometric Functions Special Issue of LAA Honoring Chandler Davis Re: LCAS, LAPACK and LINPACK Re: LCAS, LAPACK and LINPACK Re: LCAS, LAPACK and LINPACK Two Forthcoming SIAM Meetings Frontiers of Massively Parallel Computation World Congress on Computational Mechanics Mathematical Circus at ENS Lyon, FRANCE Symposium at the Interface: Computing Science and Statistics Position at University of Maryland, Baltimore County Position at CSRD, University of Illinois Position at University of Bath, UK Contents: IMA Journal of Numerical Analysis Contents: SIAM Applied Mathematics Contents: Interval Computations Contents: SIAM Optimization Submissions for NA Digest: Mail to na.digest@na-net.ornl.gov. Information about NA-NET: Mail to na.help@na-net.ornl.gov. ------------------------------------------------------- From: Gene Golub Date: Thu, 13 Feb 92 23:16:53 CST Subject: Congratulations to Bill Gear and Dick Tapia Congratulations to Bill Gear and Dick Tapia on their election to the National Academy of Engineering. The citations read as follows. For Gear: For seminal work in methods and software for solving classes of differential equations and differential-algebraic equations of significance in applications. For Tapia: For contributions in linear and nonlinear programming, and for creative leadership in minority education in computer science. Gene Golub ------------------------------ From: Gene Golub Date: Fri, 14 Feb 92 8:52:11 CST Subject: A Reception at the IMA Workshop To: Attendees of the IMA Workshop on ITERATIVE METHODS FOR SPARSE AND STRUCTURED PROBLEMS You are cordially invited to a reception on Sunday, Feb 23, 1992 at the Kenwood Retirement Apartments 825 Summit Ave (near Hennepin and Franklin) Minneapolis in the "Party Room" on the 15th floor. 7-10pm Snacks and drink will be provided by Gene Golub and Bob Plemmons. If possible, let us know if you can come. REPLY-to: golub@ima.umn.edu or plemmons@ima.umn.edu ------------------------------ From: eg@itt-mta-gw2arpa.fal-braunschweig.dbp.de Date: 10 Feb 92 7:06 Subject: Help Needed with SPARSE1.3 Hi, after having downloaded SPARSE1.3 from NETLIB and getting the testprogram up and running pretty fast I get bogged down by unexpected problems now. I am using SPARSE1.3 in a Fortran environment but cannot get it to run correctly. Firstly, as a non C programmer I found 2 bugs in the sfFortran conversion library (wrong order in parameter list, plain variable where pointer was required). The coefficient matrix is set up correctly but the solutions are wrong. Also I get error status 1 and 2 where they should not turn up (at spGetElement). Now I suspect there might be other bugs in the Fortran conversion library or elsewhere. Is there anybody around who has used SPARSE1.3 in the FORTRAN environment and who could help out? I am working on a SPARC Platform SUN MP670. Many thanks in advance. 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: Christian de Polignac Date: Thu, 13 Feb 92 17:23 N Subject: Whittaker Confluent Hypergeometric Functions Does anyone know Fortran subroutines for: -Whittaker functions (see Magnus/oberhettinger/Soni) M khi,mu (x) and W khi,mu (x) for x>0 -Confluent hypergeometic 1 F 1 (a,b;x) Christian de Polignac Institut Laue Langevin BP 156 X 38042 Grenoble Cedex France ------------------------------ From: Hans Schneider Date: Sat, 15 Feb 92 16:17:49 CST Subject: Special Issue of LAA Honoring Chandler Davis LINEAR ALGEBRA AND ITS APPLICATIONS Special Issue Honoring CHANDLER DAVIS Chandler Davis will reach the mandatory retirement age at the University of Toronto this year. While he remains as vigorously active as ever, this is an appropriate time to recognize his contributions to this journal, to mathematics, and to our lives. A special issue of LINEAR ALGEBRA AND ITS APPLICATIONS in honor of Chandler Davis is scheduled for publication in the first half of 1994. The purpose of this announcement is to solicit papers for this issue. Papers are invited concerning any aspect of linear algebra, its applications, and its interactions with the theory of operators on Hilbert space. All contributions will subject to the normal reviewing process. Submissions should be sent by March 31, 1993 to one of the special editors of this issue: Rajendra Bhatia Indian Statistical Institute New Delhi 110016 INDIA vikram!isid!rbh@shakti.ernet.in Shmuel Friedland Department of Mathematics University of Illinois at Chicago Box 4348, M/C 249 Chicago, IL 60680 U.S.A. u12735@uicvm.bitnet Peter Rosenthal Mathematics Department University of Toronto Toronto, Ontario M5S 1A1 CANADA rosent@math.utoronto.ca Papers may also be submitted to the editor-in-chief of this Journal. ------------------------------ From: James Demmel Date: Tue, 11 Feb 92 10:36:11 CST Subject: Re: LCAS, LAPACK and LINPACK I would like to add the following computational experience regarding the development of portable software that can accommodate VAX D-format. In the LAPACK project we have spent much of the last two weeks trying to get our rather comprehensive test code to pass all its tests on a VAX in D-format. It passes everywhere else we have tried so far, including IEEE arithmetic, Crays, IBMs, and VAX single precision (F-format). We have tried to write software that can robustly handle problems with badly scaled data, including very small or very large values. The limits on how small the data can be, vary for different classes of algorithm, but may be SAFMIN/EPS, SQRT(SAFMIN) or SQRT(SAFMIN/EPS), where SAFMIN is a "safe minimum" close to the underflow threshold, and EPS is the machine precision. IN VAX D-format, these three expressions have the approximate values 1.E-22, 1.E-20, and 1.E-11, which are hardly very tiny, especially when compared with the machine precision of 1.E-17. Our test software is designed to test the software close to these limits. The narrow exponent range on the VAX (combined with the lack of gradual underflow) has required us to do extra work, refining details of the routines and test software, in order to get the routines to pass the tests. In the end we are still left with a few large "test ratios" (basically scaled residual norms), that we have not yet been able to diagnose or cure. Since these large residuals only occur for badly scaled problems and only in VAX D-format, we have decided, with some regret, to go ahead and release the software without having eliminated them, since we do not want any more delay in releasing the software. I mentioned this result to Pete Stewart, one of the original LINPACK developers, and he said that they had never gotten LINPACK to work in all cases in VAX D-format either, and had given up too. (In fact, Velvel Kahan and I began our work on the bidiagonal SVD just by trying to fix the underflow bug that caused the LINPACK SVD to occasionally fail to converge in Vax D.) This confirms my opinion that it is not our software that is poorly designed, but the VAX D format. Of course, it would be probably be possible in the end to fix the problems with either LINPACK or LAPACK, but the point is that a lot of extra work is required, and extra complexity must be added to the code, which would not be needed for most other floating-point formats in current use. This (among other reasons) leads me to oppose a standard like LCAS that would permit VAX D-format in the name of aiding portable software development. Jim Demmel Math Dept. and CS Division U. C. Berkeley demmel@cs.berkeley.edu ------------------------------ From: Somebody Dawson Date: Wed, 12 Feb 92 07:53:18 PST Subject: Re: LCAS, LAPACK and LINPACK You are opposed to the LCAS because you are unable to write successful test programs? I have trouble buckling my seat belt, but still don't advocate the repeal of automotive safety laws. I think you are missing or ignoring the point. If the parameters, like those required by LCAS, describing a floating point data type were readily available, then it would be far easier to write portable test procedures -- even for data types as dubious as VAX D-format. ------------------------------ From: Richard Lehoucq Date: Thu, 13 Feb 92 12:57:30 CST Subject: Re: LCAS, LAPACK and LINPACK Jim, One question. How does one determine a "safe minimum" for a particular machine. I am aware that VAX D has the same smallest representable(normalized) number in VAX D-format and VAX F-format. I'm under the impression that the same smallest representable (normalized) number is (base)**(base**(number of bits allowed in the exponent) - bias). Call this the "Platonic minimum". Clearly your "safe minimum" is a number no smaller than this. Would this SAFMIN be the smallest (normalized) number that can be safely recipricated? Are you all writing up your experiences with "development of portable software" in any type of report? I'd love to look through this. When I was testing various eigensystem codes at IMSL we encountered the same problems with VAX D format. In the case of the symmetric code we had a test that checked to see whether to skip a householder step (during the reduction to tri. form)if the norm of the part of the vector that we wanted to zero out was less than the "platonic minimum"/eps.(even after scaling the original matrix!) Otherwise we ran the risk of losing orthogonalty of our basis of computed eigenvectors. We took our cue from Wilkinson's remarks in HACLA regarding the symmetric eigenvalue problem. This quick test worked quite well in practice. Richard Hanson and I came to the conclusion that there was only so much you can do about writing robust code for all machines given the querks of a few "designed" F.P. units. As you pointed out this is because of the poor design(I agree with you) of VAX D-format. Remember Stan Brown's F.P.A. model for well designed f.p.units? VAX D-format barely made it with their "platonic minimum"/eps <(just barely) eps**2. I learned alot of practical numerical analysis when I worked at IMSL and one of the goals was to design and develop portable scientific software. It's actually quite a fascinating "ordeal" to go thru. Rich Lehoucq ------------------------------ From: Tina Flores Date: Wed, 12 Feb 92 11:45:23 EST Subject: Two Forthcoming SIAM Meetings Now available........ Programs and registration materials... 1. Fourth SIAM Conference on Optimization May 11-13, 1992, Hyatt Regency Hotel, Chicago, Illinois 2. Sixth SIAM Conference on Discrete Mathematics June 8-11, 1992, University of British Columbia, Vancouver, Canada To receive your copies, contact SIAM...now! Call 215-382-9800, fax 215-386-7999, e-mail meetings@siam.org Many thanks. Tina ------------------------------ From: Jack Dongarra Date: Wed, 12 Feb 92 09:10:28 -0500 Subject: Frontiers of Massively Parallel Computation CALL FOR PAPERS FRONTIERS '92: The 4th Symposium on the Frontiers of Massively Parallel Computation October 19-21, 1992 McLean Hilton McLean, Virginia This symposium is the fourth in a series of biannual meetings on massively parallel computation, focusing on research related to, or adaptable for, systems with 1,000 or more processors. Submissions of original research papers about any aspects of the design, analysis, development, and/or use of massively parallel computers are solicited. Papers relating to high performance computing and communications are of particular interest. PAPER SUBMISSIONS: The corresponding author is requested to include in a cover letter the following information: (1) complete postal address; (2) electronic mail address; (3) phone number; (4) fax number; (5) key phrases that characterize the paper's topic; (6) whether the manuscript should be considered for poster presentation if it is not accepted as a regular paper; (7) a statement that the manuscript is unpublished and is not under review for another conference. Please submit SIX (6) copies of a summary of original work, in English, to: Professor H. J. Siegel Program Chair, Frontiers '92 School of Electrical Engineering 1285 Electrical Engineering Building Purdue University West Lafayette, IN 47907-1285, USA so that they arrive by MARCH 2, 1992. The summary text should be restricted to TEN double-spaced (i.e., point size 12, vertical spacing 24) 8.5" x 11" pages. References, figures, tables, etc., may be included in addition to the ten pages of text. Submissions received after the due date or exceeding the length limit may be returned and not considered. Submissions will be acknowledged promptly by electronic mail and decisions sent by May 29, 1992. Camera-ready copy for the proceedings (for both papers and posters) will be due July 1, 1992. Submission related questions should be sent to the internet address: front92@ecn.purdue.edu Selected papers will be eligible for publication in a dedicated issue of the Journal of Parallel and Distributed Computing, to be guest-edited by Joseph JaJa, University of Maryland, and David Schaefer, George Mason University. WORKSHOPS: Proposals are solicited for organizing half-day workshops that will be held on the first day of the symposium. Please send your proposal by February 3, 1992 to: Professor Isaac D. Scherson Workshops Chair, Frontiers '92 Department of Information & Computer Sciences University of California- Irvine Irvine, CA 92717, USA e-mail: wsf92@ics.uci.edu fax: (714) 856-4056 TUTORIALS: Proposals are solicited for organizing full or half-day tutorials that will be held on the first day of the symposium. Please send your proposal by February 3, 1992 to: Ms. Judy Devaney Tutorials Chair, Frontiers '92 NIST Building 225, Room B-146 Gaithersburg MD 20899-0001, USA e-mail: judy@cam.nist.gov phone: (301) 975-2882 COMMERCIAL EXHIBITORS: For information, please contact: Professor Abdou Youssef Exhibits Chair, Frontiers '92 Department of EE and CS School of Engineering and Applied Science George Washington University Washington, DC 20052, USA e-mail: youssef@gwusun.gwu.edu phone: (202) 994-5513 GENERAL CHAIR - Pearl Wang, George Mason University PROGRAM CHAIR - H.J. Siegel, Purdue University PROGRAM VICE-CHAIRS Algorithms - Leah Jamieson, Purdue University Architecture - Ken Batcher, Kent State University Applications - Jack Dongarra, Univ Tenn/ORNL Software - Andre van Tilborg, ONR PROGRAM COMMITTEE Fran Berman, UC - San Diego Tom Blank, Maspar Computer Jim Browne, Univ Texas-Austin Tom Casavant, Univ Iowa Janice Cuny, Univ Massachusetts Larry Davis, Univ Maryland Doug DeGroot, Texas Instruments Hank Dietz, Purdue Univ John Dorband, NASA GSFC John Feo, Lawrence Livermore Nat Lab Jeanne Ferrante, IBM TJ Watson Raphael Finkel, Univ Kentucky Geoffrey Fox, Syracuse University Richard Freund, NOSC John Gustafson,Ames Lab/Iowa St. Susanne Hambrusch, Purdue Univ Mary Jane Irwin, Penn State Univ Anita Jones, Univ Virginia Russ Miller, SUNY - Buffalo Dennis Parkinson, AMT Donna Quammen, George Mason U John Riganati, SRC Sartaj Sahni, Univ Florida Thomas Schwederski, Inst. Microelectronics Stuttgart Marc Snir, IBM TJ Watson Ted Tabloski, Thinking Machines Stephen Taylor, Caltech Patricia Teller, NM State Univ Elizabeth Williams, SRC Michael Wolfe, Oregon Grad Inst. Pen-chung Yew, Univ Illinois Abdou Youssef, Geo Washington U ADVISORY BOARD Ken Batcher, Kent State Univ Jerry Brackbill, LANL Harold Breaux, BRL Mel Ciment, NSF Hank Dardy, NRL Larry Davis, Univ Maryland Marvin Denicoff, TMC John Dorband, NASA GSFC Milt Halem, NASA GSFC R. Michael Hord, GE Gregory McRae, CMU Paul Messina, Caltech Tor Opsahl, CIT David Schaefer, George Mason U Bill Scherlis, DARPA Paul Schneck, SRC Francis Sullivan, NIST Charles Taylor, UCLA Sponsored by IEEE Computer Society NASA Goddard Space Flight Center If you would like an advance program and registration information for FRONTIERS '92, please send your name and address to James Fischer Frontiers '92 Code 932.1 NASA Goddard Space Flight Center Greenbelt, MD 20771 USA email: f92info@gmuvax2.gmu.edu ------------------------------ From: Taketomo Mitsui Date: Thu, 13 Feb 92 20:03:31 JST Subject: World Congress on Computational Mechanics Dear Colleagues on NA net; Even though it is now early in 1992, the Organizer of the following Congress in 1994 wishes to circulate its announcement. T. Mitsui WCCM III (The Third World Congress on Computational Mechanics) August 1 - 5, 1994 Nippon Convention Center, Chiba, Japan Following fruitful conferences at Austin (USA) and Stuttgart (Germany), WCCM III is being arranged to be held on August 1 - 5, 1994 at the Nippon Convention Center, Makuhari, Chiba Prefecture, Japan. Makuhari, located halfway between the New Tokyo International Airport at Narita and metro- politan Tokyo, is the largest and newly-bulit convention city in Japan. The genral form of the WCCM III will follow those of the preceding Congresses. The Organizing Committee, however, is attempting to stress on the following points: 1. An ambitious program will be planned to cover challenging topics in basic sciences and technologies. 2. A number of best papers will be given awards through recommendations of an international paper reviewing committee. 3. Promising young researches from all over the world will be encouraged to attend the Congress. The WCCM III at Chiba expected to be a forum to communicate ideas and new developments from a wide range of views. Researchers and engineers interested in this field are welcome to the Congress. Scientific and commercial exhibitions will be held concurrently. Congress Themes: (i) Mathematical modelling and numerical methods. (ii) Solid and structural mechanics. (iii) Fluid dynamics. (iv) Nonlinear dynamics. (v) Material science. (vi) CAD/CAM/CAE, AI, Expert System, CG. (vii) Smart algorithms and adaptive methods. (viii) Parallel computing. (ix) Computational physics (x) Industrial applications. The official language will be English. Detailed information regarding call for papers, official registrations, accommodation and others will be announced in the middle of 1992. Contact address: Prof. T. Kawai WCCM III Office Department of Electrical Engineering Science Univsersity of Tokyo 1-3 Kagurazaka, Shijuku-ku, Tokyo 162 Japan Tel: +81-3-3235-5630 Fax: +81-3-3260-8236. The Congress is organized by The International Association for Computational Mechanics (IACM). ------------------------------ From: Claudine Schmidt-Lain Date: Fri, 14 Feb 92 15:55:23 +0100 Subject: Mathematical Circus at ENS Lyon, FRANCE FIRST ANNOUNCEMENT OF MATHEMATICAL CIRCUS Location: Ecole Normale Superieure de Lyon, France Dates: April 3-4 1992 " SOME MATHEMATICAL ASPECTS OF COMBUSTION THEORY" The "RENCONTRES MATHEMATIQUES", Mathematical Circus, is an informal meeting of mathematicians to gather around a principal speaker and a leading subject. It always takes place at ENSL, about every month. The previous ones were about homogeneisation theory, bifurcation theory, kinetics equations ... This time the leading speaker is H. BERESTYCKI, University of Paris VI. He will give three talks covering various aspects of flame theory, free boundary problem, qualitative aspects of elliptic equations and stability. He will be surrounded by: C-M BRAUNER: University of Bordeaux, France G. JOULIN: ENSMA Poitiers, France W. DOLD: University of Bristol, England The circus is unique in that it is VERY informal, and thus allows us to talk about the very latest results as well as interesting work in progress. In our previous meetings there has been lots of informal discussion and a very healthy mix of industrial and academic participants. GRADUATE STUDENTS ARE WELCOME ! We have arranged special conference train fares with SNCF. Ask just for a "Congress Ticket". A restricted number of uncharged rooms are at our disposal on Campus. There is also some hotels a few minutes' ride from ENSL campus. To register, please send e-mail to Claudine Schmidt-Laine at the adress below. As usual, there is no registration fee. The circus will begin on Friday morning and will end on Saturday noon. For further information please contact: Claudine Schmidt-Laine Unite de Mathematiques Pures et Appliquees Ecole Normale Superieure de Lyon 46, Allee d'Italie F-69364 LYON Cedex 07 FRANCE Phone: (33) 72.72.80.34 Fax: (33) 72.72.80.80 e-mail: schmidt@frensl61.bitnet ------------------------------ From: Joe Newton Date: Fri, 14 Feb 92 09:33:19 CST Subject: Symposium at the Interface: Computing Science and Statistics INTERFACE `92 INFORMATION AND REGISTRATION FORM H.J. Newton, Department of Statistics, Texas A&M Univ. College Station, Texas 77843-3143, (409) 845-3141, jnewton@stat.tamu.edu, FAX: (409) 845-3144 24th Symposium on the Interface: Computing Science and Statistics THEME: Graphics and Visualization MARCH 18-21, 1992 - COLLEGE STATION, TEXAS---COLLEGE STATION HILTON KEYNOTE SPEAKER: James Blinn, `Designing Animation for Mathematics Education' PLENARY SPEAKER: Edward Tufte, `Envisioning Information' INVITED SESSIONS: Visualization Methods for Science and Statistics Visualizing Multivariate Data and Functions Geographic Information Systems Visualization in Climate Research Visualization Software Visualizing Programs Wavelets and Nonparametric Modeling Nonparametric Regression Spatial Time Series Time Series Computing Neural Networks Conditional Methods in Regression and Logistic Regression Bayesian Computing Sampling Based Approaches for Bayesian Inference Advanced Statistical Techniques in Industry Statistical Methods in Software Quality Evaluation Building on S Unix Tools for Statistical Computing High Performance Computing VISUALIZATION SHORT COURSE Professor Edward Tufte will give a short course entitled "Design for Data Visualization" on Thursday evening, March 19. Edward Tufte teaches at Yale University where he is Professor of Political Science and Statistics, Lecturer in Law, and Senior Critic in Graphic Design. He has written six books, including the widely acclaimed The Visual Display of Quantitative Information. There is no fee for the short course. More information, including electronic registration forms, is available from Joe Newton ------------------------------ From: Thomas Seidman Date: 13 Feb 92 08:35:00 EST Subject: Position at University of Maryland, Baltimore County ANNOUNCEMENT OF POSITION AT UMBC The Department of Mathematics and Statistics at the University of Maryland Baltimore County has been authorized to hire a Visiting Assistant Professor for a two-year term, starting in the Fall of 1992, with teaching duties of 3 courses in each semester. As replacement of faculty on leave, this is not a tenure-track position. An additional such position, with a one-year term, may also become available. Preference will be given to a candidate with active research interests in Optimization, in Nonlinear Partial Differential Equations and/or related Numerical Analysis, or such as to complement the existing Mathematical strengths of the Department. CV and 3 reference letters should be sent to Thomas I. Seidman, Acting Chair, Department of Mathematics and Statistics, University of Maryland Baltimore County, Baltimore, MD 21228-5398. Applicants will be considered until the position is filled. AA/EOE: women, minorities, and disabled persons are encouraged to apply. ------------------------------ From: E. Gallopoulos Date: Fri, 14 Feb 92 18:27:12 CST Subject: Position at CSRD, University of Illinois POSTDOCTORAL RESEARCH ASSOCIATE POSITION Center for Supercomputing Research and Development University of Illinois at Urbana-Champaign The Center for Supercomputing Research and Development (CSRD) at the University of Illinois at Urbana-Champaign is seeking Postdoctoral Research Associates for August, 1992. Our objective is to provide one- or two-year opportunities for young scholars to initiate their research careers in an exciting and supportive environment. Applicants are sought with interests in the areas of computational sciences and engineering and parallel computing including: parallel algorithms, applications of parallel computers to science and engineering, computer architecture and system packaging, operating systems, performance evaluation, problem-solving environments, and restructuring compilers. Selection will be based upon evidence of professional promise, capacity for independent work, and outstanding achievements to date. Doctoral degree in computer science, electrical engineering, or a related field is required; degree should be received since 1989. Appointees will devote most of their efforts to independent research or participate in on-going projects. For those interested, there may be opportunities to lecture/teach. Salaries will be negotiable; appointments will be full-time temporary. For full consideration, applications should be received by March 6, 1992. Interviews may take place before the closing date, but final decisions will not be made until after Mar. 6. Please refer to ad PD91 and send applications (i.e., a letter of interest and complete Curriculum Vitae, including names, addresses and telephone numbers of at least 3 references) to: Ms. Sandy Cunningham Center for Supercomputing Research and Development University of Illinois at Urbana-Champaign 305 Talbot Lab 104 S. Wright St. Urbana, IL 61801 Telephone: 217-244-1611 The University of Illinois is an Affirmative Action/Equal Opportunity Employer. ------------------------------ From: A. Spence Date: Fri, 14 Feb 92 9:51:16 GMT Subject: Position at University of Bath, UK UNIVERSITY OF BATH SCHOOL OF MATHEMATICAL SCIENCES LECTURESHIP IN NUMERICAL ANALYSIS / COMPUTATIONAL APPLIED MATHEMATICS Applications are invited for the above lectureship which is available from 1st September 1992 in the School of Mathematical Sciences. The successful applicant will have research interests in Numerical Analysis or Computational Applied Mathematics. This is an area of considerable strength and activity, which is at present supported by one Professor, three lecturers, four postdoctoral Research Officers, one postgraduate Research Officer, and six postgraduates. Within the Mathematics Group there is considerable involvement in the mathematics of nonlinear systems and this provides a strong unifying theme for much of our activity in pure and applied Mathematics. Members of staff have access to modern and powerful computing facilities. There is an extensive network of SUN-4 workstations connected by an ethernet, and a SIMD MasPar machine with 1024 processors. A 32-transputer MEIKO Computing Surface, part of a collaborative venture involving several other Schools is also available for MIMD computation. The major criterion for making the appointment will be strength in research: only persons of proven research record or recognisable research potential will be considered. The person appointed will be expected to teach at undergraduate and postgraduate levels in the School as well as probably doing some service teaching. At the beginning, the teaching load will be commensurate with age and experience. The new lecturer will be expected to develop independent research and to play an active role in the research activities of the School. Closing date: 6th March 1992. Candidates seeking further information may contact Alastair Spence Telephone: +44 225 826011, fax: +44 225 826492, email: as@uk.ac.bath.maths or na.spence@na-net.ornl.gov ------------------------------ From: Iain Duff Date: Mon, 10 Feb 92 08:50:18 GMT Subject: Contents: IMA Journal of Numerical Analysis IMA JOURNAL OF NUMERICAL ANALYSIS - Volume 12, Number 1 J J Du Croz and Stability of methods for matrix inversion N J Higham M Arioli and Stability, convergence and conditioning F Romani of stationary iterative methods of the form (i+1) (i) x = Px + q for the solution of linear systems J A Cuminato Uniform convergence of a collocation method for the numerical solution of Cauchy-type singular integral equations: a generalization W Han The P-version penalty finite element method G J Cooper Weak nonlinear stability of implicit Runge-Kutta methods C A Hall and Approximation methods in the computer T A Porsching numerically controlled fabrication of optical surfaces Part I: finite dimensional material removal profile spaces. N Osada A method for obtaining sequence transformations B Mulansky Chebyshev approximation by spline functions with free knots R K Beatson and Univariate interpolation on a regular finite M J D Powell grid by a multiquadric plus a linear polynomial ------------------------------ From: Laura Helfrich Date: Tue, 11 Feb 92 08:06:50 EST Subject: Contents: SIAM Applied Mathematics Table of Contents SIAM Journal on Applied Mathematics Vol. 52, No. 3, June 1992 On a Minimization Problem Arising in Wetting Amy Novick-Cohen Symmetric Supersonducting States in Thin Films Sheng Wang and Yisong Yang A New Method for Mass Transport Problems with an Application to Haemofilters N.F. Britton The Electrostatic Field About a Thin Oblate Dielectric Body of Revolution Richard Barshinger Rotating Waves for Semiconductor Inverter Rings Cc. Lim, J. M. Pimbley, C. Schmeiser, and D. W. Schwendeman Charge Carrier Dynamics in Alpha Particle Tracks J. M. Pimbley and J. D. Cole Inverse Problems for Metal Oxide Semiconductor Field-Effect Transistor Contact Resistivity Weifu Fang and Ellis Cumberbatch The Interior Radon Transform Peter Maass An Inverse Eigenvalue Problem for and Arbitrary, Multiply Connected, Sounded Domain in R3 with Impedance Boundary Conditions E. M. E. Zayed On Exponential Asymptotics for Nonseparable Wave Equations III: Approximate Spectral Bands of Periodic Potentials on Strips R. E. Meyer and M. C. Shen Frequency and Phase Locking of Spatially Periodic Perturbed Sine-Gordon Breather Trains M. Gregory Forest, S.-P. Sheu, and Amarenda Sinha Defect Dynamics in a Dissipative System F. Moura Neto Bifurcation to Rotating Waves in Equations with O(2)-Symmetry P. J. Aston, A. Spence, and W. Wu Numerical Stability Analysis of a Class of Functional Differential Equations W. D. Curtis, R. O. Fox, and K. Halasi Stability and Bifurcation for a Multiple-Group Model for the Dynamics of HIV/AIDS Transmission Wenzhang Huang, Kenneth L. Cooke, and Carlos Castillo-Chavez Analysis of a Model Representing Stage-Structured Population Growth with State- Dependent Time Delay Walter G. Aiello, H. I. Freedman, and J. Wu A Discussion of the Quasi-Euler--Lagrange Equation William Roger Fuller A Processor-Shared Queue That Models Switching Times: Normal Usage Charles Knessl and Charles Tier On Faster than Nyquist Signaling: Further Estimations on the Minimum Distance D. Hajela ------------------------------ From: Baker Kearfoot Date: Thu, 13 Feb 92 00:38:18 CST Subject: Contents: Interval Computations CONTENTS OF THE SECOND ISSUE OF INTERVAL COMPUTATIONS Research Articles S.Shary Optimal Solution of interval linear algebraic systems. I. (in English) V.Kreinovich, A. Bernat, E. Villa, Y.Mariscal Parallel Computers. Estimate errors caused by imprecise data (in English) Computer Tools R.Hammer, M.Neaga, D.Ratz, D.Shiriaev PASCAL-XSC: A new language for scientific computing (in Russian) Advertisement The full translation into Russian of the ANSI/IEEE standards on computer arithmetic Program package ASIAS Reviews and Abstracts P.S.Pankov. Review of the new monograph: Two-Sided Numerical Methods, by B.S. Dobronets and V. V. Shaydurov (in English) Meetings Actual problems of applied mathematics. All-Union conference. Saratov May 20-22, 1991. A brief report (English and Russian) A.Davidenkoff, Advanced seminar on programming languages for scientific/ engineering computation, Leningrad, June 3-6, 1991. A summarizing report (in English) Interval Subjects at the SCAN-1991 Symposium. Information (Russian) Resolution of the 8-th All-Union Workshop on interval mathematics. Bishkek, October 1-3, 1991 (English) Preliminary announcement, call for papers and further information for a conference on numerical analysis with automatic result verification. Lafayette, Louisiana, February 25 -- March 1, 1993 (English) Bibliography of Soviet works on interval computations. Part 1 (English) ------------------------------ From: SIAM Date: Thu, 13 Feb 92 13:58:48 EST Subject: Contents: SIAM Optimization SIAM Journal on Optimization May 1992 Volume 2, Number 2 CONTENTS Dual Methods in Entropy Maximization. Application to Some Problems in Crystallography Andree Decarreau, Danielle Hilhorst, Claude Lemarechal, and Jorge Navaza A Low Complexity Interior-Point Algorithm for Linear Programming Michael Todd An SQP Augmented Lagrangian BFGS Algorithm for Constrained Optimization R. H. Byrd, R. A. Tapia, and Yin Zhang A Structure Exploiting Algorithm for Nonlinear Minimax Problems Andrew R. Conn and Yuying Li Optimal Distribution of Larvicide in Running Waters Alain Chalifour and Michel C. Delfour On the Superlinear and Quadratic Convergence of Primal-Dual Interior Point Linear Programming Algorithms Yin Zhang, Richard A. Tapia, and John E. Dennis, Jr. A Robust Trust Region Method for Constrained Nonlinear Programming Problems James V. Burke ------------------------------ End of NA Digest ************************** -------