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mas

v0.0.3

Published

JavaScript Modeling and Simulation. Currently supports a portion of the System Dynamics (SD) formalism.

Downloads

237

Vulnerabilities

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Links

Git

Maintainers

ptgroganptgrogan

Keywords

Readme

mas

JavaScript Modeling and Simulation

This library implements basic components required for modeling and simulation in JavaScript. It currently supports a portion of the System Dynamics (SD) formalism.

This package adopts the RequireJS interface for dual use in Node or a browser.

SD Components and Functions

  • Stock (mas.sd.Stock)
  • Flow (mas.sd.Flow)
  • Parameter (mas.sd.Parameter, a Flow with constant value)
  • Delay1 (mas.sd.Delay1, first-order exponential delay function)
  • Smooth (mas.sd.Smooth, first-order exponential smoothing function)

Simulators and Integration Methods

  • Simulator (mas.sim.Simulator, a basic simulator with event bindings)
  • LoggingSimulator (mas.sim.LoggingSimulator, logs entity values at each time step)

Known limitations:

  • The current time advancement as a decentralized tick/tock procedure only allows an explicit (forward) Euler integration method. More precise methods such as 4th order Runge-Kutta (RK4) would require either a centralized state update function or more numerous iterative data exchange periods.
  • Results cannot be directly compared to outputs of some tools due to a difference in numerical precision. For example, most versions of Vensim only support single-precision floating-point numbers while JavaScript is double-precision.