# Welcome to pypepa’s documentation!¶

pypepa is a library and a toolset for Performance Evaluation Process Algebra (PEPA) by Jane Hillston. pypepa is not a fully PEPA compatible tool, it supports a limited (for now) PEPA syntax (we only allow <> operator in system equation), i.e. it does not suport hiding operator (e.g. P\{a,b,}), does not calculate passage time and provide model checking. pypepa also does not use Kronecker state space representation and Hillston’s aggregation algorithms, so it can have worse performance than the PEPA Eclipse Plugin. All these features, plus more, are planned to be added in future versions.

pypepa consist of three parts:

1. libpepa - a library written in Python,
2. pypepa - a command line tool for solving and graphing,
3. distr - map reduce tools for solving large PEPA experiments (not done yet)

## News¶

(18.07.2013) pypepa can now calculate utilisations of components’ states, output argument works again

(07.06.2013) Added support for defining rates as mathematical expressions, e.g. r=2*3+7*n;