Rtcl is a Tcl extension for executing code in the R[http://www.r-project.org] programming language. R is a free version of Bell Labs' S language for statistical computing. Rtcl embeds an R interpreter into Tcl, and allows access to it via Tcl commands. Rtcl was written by [Neil McKay], and is available from http://www.eecs.umich.edu/~mckay/computer/Rtcl0.1.tar.gz