DARE IIIB — a CSSL-type batch-mode simulation language for CDC 6000-series computers

Abstract

This paper describes a batch-mode FORTRAN-based continuous-system simulation language possessing most of the desirable features specified by the Simulation Council's CSSL committee.

Of course, there are already many continuous-system simulation languages, such as DSL/90 and CSMP (block- oriented), MIMIC, SL-1, CSSL III, etc.; however, to the writers' knowledge, only MIMIC and CSSL III are currently available for CDC-6000 series systems. MIMIC, while equation-oriented, is not as powerful as CSSL III, is somewhat rigid in format, and hard to modify. CSSL III usage involves a surcharge to the program originator, and is thus not attractive for educational applications.

DARE IIIB, locally developed under NSF sponsorship, is a modern CSSL-type language, almost as powerful as CSSL III, that is available to any potential user for the cost of a magnetic tape. DARE IIIB is structured to permit convenient user modification, e.g., it is relatively easy to add new integration rules, run-time strategies, or special library subprograms.

Problem equations are entered in a form close to ordinary mathematical notation; the associated proce dural language is FORTRAN. User-chosen variable names in the problem description are accommodated by a translation phase. Run-time data is entered via standard FORTRAN IV namelist data cards. A variety of output options are provided, including line- printer listings and plots, and CalComp plotter dis plays.

Single- or multiple-run problems may be specified, with storage files used for saving output data for subsequent cross-plotting, reentry into future runs, etc. In addition to an internal collection of library functions, special functions may be specified in FORTRAN, and one-or-two variable table lookup function generation is provided. DARE IIIB provides a choice of several internal fixed- and variable-step integra tion rules; the user can insert his own run-time con trol subroutine for special application.

The system is presently implemented on a CDC 6400 with 65K of core memory (SCOPE 3.2 operating system), and an off-line CalComp plotter. DARE IIIB can accommodate problems with 100 parameters, 200 state variables, and 350 output variables.

This paper describes the major features of the lan guage, and presents basic user information, and several examples.

Inquiries regarding this software package should be addressed to Professor John V. Wait.

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References

Brennan R.D. and Linebarger R.N.

A survey of digital simulation

SIMULATION pp 22-36 December 1964

Sansom F.J. MIMIC: Successor to MIDAS Conference paper Joint meeting of Central and Midwestern Simulation Councils May 1965

Syn W.M. and Wyman D.G. DSL/90 digital simulation language systems IBM Corp. San Jose California July 15 1965

SCi Software Committee

The SCi continuous system simulation language (CSSL)

SIMULATION pp 281-303 December 1967

Schram S. and Boren J. A real-time 6-degree-of-freedom aircraft simulation with SL-1 Proc. 1970 SCSC

Denver Colorado

1970

10.

Trevor A.B. and Wait J.V. DARE IIIB User's Manual CSRL MEMO 221 University of Arizona Department of Electrical Engineering Tucson Arizona July 1971

11.

Korn G.A.

Project DARE: Differential Analyzer REplacement by on-line digital simulation

Proc. AFIPS Fall Joint Comp. Conf. pp 247-254 1969

12.

Goltz J.R. DARE I, and on-line digital simulation system CSRL MEMO 169 University of Arizona Department of Electrical Engineering Tucson Arizona March 1969

13.

Liebert T.A. The DARE II on-line digital simulation system CSRL MEMO 202 also Proc. 1970 Summer Computer Simulation Conference March 1970

14.

15.

Forrester J.W.

Counterintuitive behaviour of social systems

SIMULATION vol 16 no 2 February 1971