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A Symbolic-Numerical Support for Computer-Aided Modelling
Abstract
Recently a great attention has been paid to Computer Aided Control Systems Design (CACSD) (see [3,6]). This new area covers such trends as specialized control-oriented Computer Aided Design (CAD), knowledge-based support of the creative processes, symbolic computer calculations and interactive man-machine dialog based on a user-friendly communication system (interface). A number of papers have been devoted to the design and implementation problems arising during the development of CACSD systems (see [2]).
In this paper certain properties of algorithms used in symbolic manipulation on signal flow graphs are investigated. The rule-based approach and Mason's formula are compared with respect to preservation of minimal rational representation. It is shown by counter example that rule-based method does not possess this property if factor cancellations are allowed at elementary operation level only. A new efficient algorithm is proposed in which this problem is resolved.
The computer programming language Prolog is quickly gaining popularity throughout the world. Since Its beginnings around 1970. Prolog has been chosen by many programmers for applications of symbolic computation. including: D relational databases D mathematical logic D abstract problem solving D understanding natural language D architectural design D symbolic equation solving D biochemical structure analysis D many areas of artificial Intelligence Until now. there has been no textbook with the aim of teaching Prolog as a practical programming language. It Is perhaps a tribute to Prolog that so many people have been motivated to learn It by referring to the necessarily concise reference manuals. a few published papers. and by the orally transmitted 'folklore' of the modern computing community. However. as Prolog is beginning to be Introduced to large numbers of undergraduate and postgraduate students. many of our colleagues have expressed a great need for a tutorial guide to learning Prolog. We hope this little book will go some way towards meeting this need. Many newcomers to Prolog find that the task of writing a Prolog program Is not like specifying an algorithm in the same way as In a conventional programming language. Instead. the Prolog programmer asks more what formal relationships and objects occur In his problem.
An Expert Systems Approach to Computer-Aided Design of Multivariable Systems
- G K H Pang
- A G J Macfarlane
- GKH Pang
Man-Machine Interfaces and Implementational Issues in Computer-Aided Control System Design
- C M Rimvall