RaTrav tool was designed to support computational biology studies where mean first-passage times (MFPTs) between initial and single or multiple final states in network-like systems are used. The tool approves arbitrary networks (graphs) where a dynamics of the Markovian type takes place. Two methods are made available for which their efficiency is strongly dependent on the topology of the defined network: the combinatorial Hill technique and the Monte Carlo simulation method.
M. Torchala, P. Chelminiak, M. Kurzynski and P. A. Bates, 'RaTrav: a tool for calculating mean first-passage times on biochemical networks', BMC Syst. Biol. 7, 130 (2013).
M. Torchala, P. Chelminiak and P. A. Bates, 'Mean first-passage time calculations: comparison of the deterministic Hill's algorithm with Monte Carlo simulations', Eur. Phys. J. B 85, 116 (2012).
Ratrav works fine.