Ptolemy II

Ptolemy II is a set of Java packages supporting heterogeneous, concurrent modeling and design. Its kernel package supports clustered hierarchical graphs, which are collections of entities and relations between those entities. Its actor package extends the kernel so that entities have functionality and can communicate via the relations. Its domains extend the actor package by imposing models of computation on the interaction between entities. Examples of models of computation include discrete-event systems, dataflow, process networks, synchronous/reactive systems, and communicating sequential processes. Ptolemy II includes a number of support packages, such as graph, providing graph-theoretic manipulations, math, providing matrix and vector math and signal processing functions, plot, providing visual display of data, data, providing a type system, data encapsulation and an expression parser, etc.