Copyright 2014, 2015 by Sander Pronk and Peter Kasson
This code calculates persistence and exchange times - not by looking at fixed-space displacements but by looking at displacements w.r.t. a locally weighted center of mass of a surrounding set of particles.
Links against gromacs 4.5
References (please cite if you use): Sander Pronk, Erik Lindahl, and Peter M. Kasson. Heterogeneity in space and time: diffusion and viscosity near interfaces. Nature Communications, 2014; 5:3034. doi:10.1038/ncomms4034
Sander Pronk, Erik Lindahl, and Peter M. Kasson. Coupled diffusion in lipid bilayers upon close approach. Journal of the American Chemical Society, 2015 Jan 21;137(2):708-14. doi:10.1021/ja508803d