Hi Daniel, [1]. Install the graphviz library: * [ http://www.graphviz.org/ ] [2]. Install the R front-end API to the graphviz library, Rgraphviz: * [ http://bioconductor.org/packages/2.2/bioc/html/Rgraphviz.html ] [3]. Bioconductor Monograph 2005, worked example: * [ http://www.bioconductor.org/mogr/chapter-code/modelingGraphs.R ] see code chunk #16 - #21. + This code produces Fig. 22.4, Table 22.1, and Fig. 22.5 from chapter 22 pages 376 - 378. Hope this helps, ... Elliot P.S. Remember to include your sessionInfo() in your mail posts: * [ http://www.bioconductor.org/docs/postingGuide.html ] + see item 4 from the 'While sending mail to the list' section. -- __________________________ MS graduate student Program in Computational Science San Diego State University http://www.csrc.sdsu.edu/