A Modeling System named DYNAGRAPH has been developed on the IBM 5550 Personal Computer with NEXUS 5500 Graphics to interactively build dynamic simulation models using APL functions. A model for the simulation is represented by APL expressions in the rows of an APL Spreadsheet. The modeling of dynamic systems is achieved by a state-variable method. The paper introduces DYNAGRAPH and the underlying modeling method. Some of the modeling functions for dynamic simulations are presented. We claim that the method is suitable and convenient for modeling problems of moderate size, especially when using APL in teaching or business environments: DYNAGRAPH is useful as a training tool and an APL program generator to enhance APL applications in management science.
/lp/association-for-computing-machinery/an-interactive-simulation-modeling-system-dynagraph-for-multi-period-ZtEG0t50Ds