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18 篇 会议

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environment parameters and basic functions for floating-point computation

Environment parameters and basic functions for floating-poin...

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1978 signum conference on the programming environment for development of numerical software

作者： Brown, W.S. Feldman, S.I. Bell Laboratories Murray HillNJ07974 United States

This paper presents a language independent proposal for environment parameters and basic functions for floating point computation, and suggests a specific representation in terms of generic functions for Fortran 77. The environment parameters were originally introduced in 1967 by Forsythe and Moler [1], who attributed the essentials of their theory to Wilkinson [2]. These parameters are also used in the PORT mathematical subroutine library [3], with precise definitions in terms of a more recent model of floating-point computation [4], and a similar set has been proposed by the IFIP Working on numerical software [5]. Three of the basic functions are taken from a proposal by Ford, Reid, and Smith [6], but redefined in terms of the parameters and the model to provide a firm theoretical foundation. The other three basic functions can be expressed in terms of these, but we feel they should be provided separately for convenience. © 1979 Proceedings of the signum conference on the programming environment for development of numerical software. All rights reserved.

关键词： Subroutines

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UNIX TM as an environment for producing numerical software

UNIX TM as an environment for producing numerical software

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1978 signum conference on the programming environment for development of numerical software

作者： Schryer, N.L. Bell Laboratories Murray HillNJ07974 United States

UNIX is a Trademark of Bell Laboratories. The UNIX't" operating system [1] supports a number of software tools which, when viewed as a whole, are an unusually powerful aid to programming. The design, implementation, documentation and maintenance of a portable FORTRAN test of the floating-point arithmetic unit of a computer is used to illustrate these tools at work. The result of this effort was a program created automatically from the paper describing the test. Thus, only the documentation had to be written;the program was automatically produced from it. Also, changes in the document (debugging) were automatically reflected in the program. The second section briefly describes the UNIX tools to be used. The third section outlines the basic problem and the fourth section shows how the tools can help solve the problem. © 1979 Proceedings of the signum conference on the programming environment for development of numerical software. All rights reserved.

关键词： UNIX

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Desirable floating-point arithmetic and elementary functions for numerical computation

Desirable floating-point arithmetic and elementary functions...

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1978 signum conference on the programming environment for development of numerical software

作者： Hull, T.E. Department of Computer Science University of Toronto TorontoON Canada

The purpose of this talk is to summarize proposed specifications for floating-polar arithmetic and elementary functions. The topics considered are: the base of the number system, precision conira1, number representation, arithmetic operations, ocher basic operations, elementary functions, and exception handling. The possibility Of doing without fixed-polnt arithmetic is also mentioned. The specifications are intended to be entirely at the level of a programming language such as Fortran. The emphasis is on convenience and simplicity from the user's point of view. Conforming to such specifications would have obvious beneficial implications for the portability of numerical software, and for proving programs correct, as well as attempting to provide facilities which are most suitable for the user. The specifications are not complete in every detail, but it is intended that they be complete "in spirit"-some further details, especially syntatic details, would have to be provided, but the proposals are otherwise relatively complete. © 1979 Proceedings of the signum conference on the programming environment for development of numerical software. All rights reserved.

关键词： Specifications

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New languages for numerical software

New languages for numerical software

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1978 signum conference on the programming environment for development of numerical software

作者： Coughran, Bill Grosse, Eric Stanford University StanfordCA United States

Existing languages for numerical software are not altogether satisfactory. Fortran, even preprocessed, has troublesome limitations. Unfortunately, proposed replacements have been discouragingly large, or omit essential features like variably dimensioned arrays and Fortran compatibility. A new language has been designed to include such crucial features, but otherwise be as small as possible. This language, called T, includes: indention to indicate block structure, novel loop syntax, and engineering format for real constants. By preprocessing into PL/I, implementation cost was kept low. But this language can only be regarded as a stopgap. The next step is to deal with more fundamental issues, by more fully exploiting arrays, by making pointers available in a controlled way, and by arranging for better declaration and syntax for using subroutine libraries. © 1979 Proceedings of the signum conference on the programming environment for development of numerical software. All rights reserved.

关键词： Syntactics

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The augment precompiler as a tool for the development of special purpose arithmetic packages

The augment precompiler as a tool for the development of spe...

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1978 signum conference on the programming environment for development of numerical software

作者： Crary, F.D. Yohe, J.M. Boeing Company SeattleWA98124 United States Mathematics Research Center University of Wisconsin-Madison MadisonWI53706 United States

We discuss the use of a FORTRAN preeompiler in the development of packages for nonstandard arithmetics. In particular, the use Of the FORTRAN prceompiler, AUGMENT, renders the source code more lucid, reduces the number Of lines of code in a nonstandard arithmetic package, facilitates modification, and ameliorates the problems of transporting such a package to another host system. © 1979 Proceedings of the signum conference on the programming environment for development of numerical software. All rights reserved.

关键词： FORTRAN (programming language)

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Extending reliability: Transformational tailoring of abstract mathematical software

Extending reliability: Transformational tailoring of abstrac...

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1978 signum conference on the programming environment for development of numerical software

作者： Boyle, James M. Applied Mathematics Division Argonne National Laboratory United States

Over the past decade, mathematical software libraries have matured from small, usually locallyassembled, collections of subroutines to large, commerclally-provlded libraries which are approaching the status of standards [Alrd;Du Croz;Fox] Despite the high quality of such libraries and the obvious economic advantages of using routines whose development cost has been shared with many other users, applications programmers, when asked: "K~y don't you use routine XYZ from IMSL, or from NAC, or from FORT?" frequently reply that library routines are too general, that they need a routine which takes advantage of special features of their problem, and that since they could not use a library routine without modifying it, they might as well write their own routine from scratch. In many, if not most, instances, the latter assertion could be easily refuted by a simple competition on selected test problems. However, the need for a routine adapted, or tailored, to a particular problem is more difficult to dismiss. It usually arises from considerations of efficiency, which may range from the perceived inefficiency of the presence of unusedoptlons in a routine to the practical impossibility of using a routine whose data representation i 9 utterly incompatible with that needed in the rest of the applications program. © 1979 Proceedings of the signum conference on the programming environment for development of numerical software. All rights reserved.

关键词： Application programs

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A transportable system for management and exchange of programs and other text

A transportable system for management and exchange of progra...

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1978 signum conference on the programming environment for development of numerical software

作者： Snyder, W.V. Jet Propulsion Laboratory 4800 Oak Grove Drive PasadenaCA91103 United States

Computer software is usually exchanged between different computer facilities via punched cards or magnetic tape. For up to about I000 images, cards are cheaper and probably easier to deal with than tape. The primary problem with cards is the variety of punch codes. Frequently, one also has the minor nuisance of repunchlng cards damaged in transit. For larger amounts of data, tape is cheaper, but there are so many tape formats in use that the recipient frequently has trouble reading a tape, even if the format is simple and well defined. Occasionally, one has the problem of parity errors, which make a tape essentially worthless. Ken test data, modules In several languages, computer output or documentation are included, the lack of organization in the material can cause a substantial amount of unnecessary human labor. This paper presents a system for exchanging information on tape, that allows information about the data to be included with the data. The system is designed for portability, but requires a few slmplemachlne dependent modules. These modules are available for a varlety of machines, and a bootstrapping procedure is provided. The system allows content selected reading of the tape, and a simple text editing facility is provided. Although the system recognizes 30 commands, information may be extracted from the tape by using as few as three commands. In addition to its use for information exchange, we expect the system to find use in maintaining large libraries of text. © 1979 Proceedings of the signum conference on the programming environment for development of numerical software. All rights reserved.

关键词： Computer software

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"programming effort" analysis of the ellpack language

"Programming effort" analysis of the ellpack language

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1978 signum conference on the programming environment for development of numerical software

作者： Rice, John R. Division of Mathematical Sciences Purdue University United States

ELLPACK is a problem statement language and system for elliptic partial differential equations (PDEs) which is implemented by a Fortran preprocessor. ELLPACK's principal purpose is as a tool for the performance evaluation of software. However, we use it here as an example with which to study the "programming effort" required for problem solving. It is obvious that problem statement languages can reduce programing effort tremendously;our goal is to quantify this somewhat. We do this by analyzing the lengths and effort (as measured by Halstead's "software science" technique) of various approaches to solving these problems. © 1979 Proceedings of the signum conference on the programming environment for development of numerical software. All rights reserved.

关键词： Partial differential equations

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