Hauptman, please use join and use ECJ mailing list for future questions. There are a variety of ways, but the easiest approach is to use the functions printIndividual and readIndividual. You provide the streams, and you'll have to set the Individual's species after reading in. Tutorial 3 also shows how to read and write populations to files. http://cs.gmu.edu/~eclab/projects/ecj/docs/tutorials/tutorial3/ Last I think there's some stuff in the mailing list archives about this topic. Sean On Jan 14, 2005, at 1:10 PM, Hauptman Ami wrote: > Hi, > > I would like to conduct experiments with individuals developed by > evolution in ECJ > > Is there any way of saving a GP individual (and\or state) and later > loading it? > > Many thanx > > ---Ami H. > >