append option).
write.simmap(tree, file=NULL, append=FALSE, map.order=NULL, quiet=FALSE)"phylo". See make.simmap and read.simmap.write.simmap will use attr(tree,"map.order") if available.map.order is neither specified by a function argument or as an attribute of tree.file=NULL).
Huelsenbeck, J. P., R. Neilsen, and J. P. Bollback (2003) Stochastic mapping of morphological characters. Systematic Biology, 52, 131-138.
Revell, L. J. (2012) phytools: An R package for phylogenetic comparative biology (and other things). Methods Ecol. Evol., 3, 217-223.
make.simmap, read.simmap, plotSimmap