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Recent Advances in the L-A-S Software used in CAD of control systems

IFAC Proceedings Volumes 1985年第8期18卷 145-150页

作者： S.P. Bingulac P.J. West W.R. Perkins Electrical Engineering Department Virginia Polytechnic Institute and State University Blacksburg VA 24061 USA Coordinated Science Laboratory and Department of Electrical and Computer Engineering University of Illinois Urbana IL 61801 USA

This paper reviews the basic features of a high-level, interactive, conversational language called L-A-S (Linear AIgebra and systems). Particular emphasis is placed upon recent developments of this Computer-Aided Design (CAD) language. Unlike the conventional menu-driven approach of many CAD packages, L -A -S provides the user with considerable flexibility in the development and maintenance of linear algebra and control algorithms. L-A-S is both a language and an interpreter. Users or L-A-S write programes while interacting with the Interpreter. Programs may he edited, stored, recalled, and executed with the same or a differernt data set. L-A-S data strunures include matrices, polynomials (continuos or discrete). and matrices of polynomials. In this paper. we briefly review the basics or the L-A-S language. Then. we concentrate on those features of L-A-S which have been added within the last year. These include the Multiple Operator Statement (MOS), L-A-S lNT-delined suhroutines. and the most-reccnt “echo” feature for interaction with the interpreter. Example, accompany the text to illustrate each new feature.

关键词： Computer-aided Design Programming Languages control Engineering Computer Applications control system analysis/synthesis

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