{"title":"An instability problem in Chebyshev expansions for special functions","authors":"A. MacLeod","doi":"10.1145/152923.152924","DOIUrl":"https://doi.org/10.1145/152923.152924","url":null,"abstract":"For the last 2 or 3 years, I have been developing a software package MISCFUN which evaluates mathematical functions not found in the standard libraries such as NAG or IMSL, or in public-domain packages such as SPECFUN or FNLIB.","PeriodicalId":177516,"journal":{"name":"ACM Signum Newsletter","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129799796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Error in Unix commands dc and bc for multiple-precision-arithmetic","authors":"Ingo Dittmer","doi":"10.1145/152923.152925","DOIUrl":"https://doi.org/10.1145/152923.152925","url":null,"abstract":"Erroroneous computations were found in the modulo-function % of the multiple-precision-software dc, standard in Unix™ -systems. Since the command bc is based upon dc, it is concerned, too.","PeriodicalId":177516,"journal":{"name":"ACM Signum Newsletter","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123141766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"MGNet: a multigrid and domain decomposition network","authors":"C. Douglas","doi":"10.1145/148089.148092","DOIUrl":"https://doi.org/10.1145/148089.148092","url":null,"abstract":"MGNet provides a mechanism for exchanging information and computer programs related to multigrid and/or domain decomposition methods.","PeriodicalId":177516,"journal":{"name":"ACM Signum Newsletter","volume":"472 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133023397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The role of LIA-1 in software portability","authors":"Jeffrey R. Dawson, M. Payne, Craig Schaffert","doi":"10.1145/148089.148095","DOIUrl":"https://doi.org/10.1145/148089.148095","url":null,"abstract":"The second committee draft of Language independent arithmetic - Part 1: Integer and floating point arithmetic is now available. This document was formerly called the Language Compatible Arithmetic Standard (LCAS) and is now referred to as LIA-1. This draft was prepared by ISO/IEC JTC1/SC22/WG11, with assistance from standards committees in several countries.","PeriodicalId":177516,"journal":{"name":"ACM Signum Newsletter","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132625689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The role of computer software in numerical analysis teaching","authors":"J. Carroll","doi":"10.1145/140682.140686","DOIUrl":"https://doi.org/10.1145/140682.140686","url":null,"abstract":"We consider some key issues in the use of computer software in Numerical Analysis teaching. By first examining the role of the computer in education, we consider how the teaching of numerical analysis is enhanced through the introduction of computer software. Practical issues such as programming language requirements and sources of numerical software are reviewed. We also consider the different ways in which textbooks and software have been combined to provide a single teaching tool. The potential for interaction between symbolic and numerical computation is also considered and one particular symbolic algebra package is briefly reviewed. Another mode of software usage within the teaching framework is that of interactive environments and, here, we concentrate on two well-known packages, MATLAB [50] and CLAM [34]. Finally we present the experiences of some Numerical Analysis teachers as they outline individual approaches to efficient use of software in their respective syllabi.","PeriodicalId":177516,"journal":{"name":"ACM Signum Newsletter","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131627286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Netlib news: big files","authors":"E. Grosse","doi":"10.1145/122645.122647","DOIUrl":"https://doi.org/10.1145/122645.122647","url":null,"abstract":"Now the collection includes large differential equation and optimization codes, packages written in C where specific filenames matter, and large bibliographies. A variety of mail size limits are appearing in the network. The use of Unix \"shell archives\" for transferring collections of files has become widely understood and accepted. In light of all this, it is clearly time for netlib to adapt. This column announces three changes for dealing with the problem of big files: ftp, revised mail splitting, and user-specified mail limits.","PeriodicalId":177516,"journal":{"name":"ACM Signum Newsletter","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133537222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The first annual large dense linear system survey","authors":"A. Edelman","doi":"10.1145/122645.122648","DOIUrl":"https://doi.org/10.1145/122645.122648","url":null,"abstract":"In the March 24, 1991 issue of NA Digest, I submitted a questionnaire asking who was solving large dense linear systems of equations. Based on the responses, nearly all large dense linear systems today arise from either the benchmarking of supercomputers or applications involving the influence of a two dimensional boundary on three dimensional space. Not surprisingly, the area of computational aerodynamics or aero-electromechanics represents an important commercial application requiring the solution of such systems. The largest unstructured matrix that has been factored using Gaussian Elimination was a complex matrix of size 55,296. The largest dense matrix solved on a Sun using an iterative method was a real matrix of size 20,000. It is unclear at this time whether dense methods are truly needed at all for huge matrices. It is intended to survey users every year with the hope of including more applications as I am made aware of them.","PeriodicalId":177516,"journal":{"name":"ACM Signum Newsletter","volume":"1404 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127440822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"FTP-file transfer program","authors":"G. Stewart","doi":"10.1145/122645.122646","DOIUrl":"https://doi.org/10.1145/122645.122646","url":null,"abstract":"As regular readers of the na-digest know, I have made my current technical reports available by anonymous ftp. The response has been encouraging, and several people have asked how to make their own reports available. Hence this little note. First some background. Ftp-short for file transfer program-is an interact interface for moving files over the network. The user can send or get ASCII or binary files. A particularly useful command is \"mget\", which expands names (e.g., paper.*) and gets all the resulting files. Details may be found in the on-line manual. Ordinarily one must have a valid account on a machine in order to ftp to it. This causes difficulties for people who want to make programs, reports, and the like available to the general public. The fix is the anonymous ftp account, which gives people restricted access to files on a machine. Here for an example, is a little run in which I listed some directories on my own machine. 331 Guest login ok, send ident as password. Password: 230 Guest login ok, access restrictions apply. ftp/, cd pub 250 CWD command successful. tip/, Is 200 PORT command successful. 150 ASCII data connection for/bin/Is (128.8.128.81,1315) (0 bytes). jeep matnxpert references reports 226 ASCII Transfer complete. 39 bytes received in 1.1 seconds (0.035 Kbytes/s) tip/, bye 221 Goodbye. thales:","PeriodicalId":177516,"journal":{"name":"ACM Signum Newsletter","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125591984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"ADA software for teaching modern computer arithmetic","authors":"M. Bartholomew-Biggs","doi":"10.1145/122649.122651","DOIUrl":"https://doi.org/10.1145/122649.122651","url":null,"abstract":"This paper describes three Ada packages which support the teaching of some recent and important ideas in numerical computation. The first is designed to enable students to write and use applications programs demonstrating the behaviour of floating point arithmetic with different precisions and roundings. It also underpins the other two packages which provide simple computational tools for interval arithmetic and for accurate arithmetic.","PeriodicalId":177516,"journal":{"name":"ACM Signum Newsletter","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123106323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Applications of best approximation","authors":"C. Dunham","doi":"10.1145/122286.122287","DOIUrl":"https://doi.org/10.1145/122286.122287","url":null,"abstract":"We attempt to classify the known applications of the theory of best approximation so that attention can be focused on useful problems.","PeriodicalId":177516,"journal":{"name":"ACM Signum Newsletter","volume":"28 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123871064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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