Hi there, I encounter the following problem with getGenerics when Rgraphviz is installed: which(!sapply(getGenerics(), isGeneric)) #graph Rgraphviz graph Rgraphviz # 105 106 107 108 so, getGenerics returns twice graph and Rgrapviz as being generics, when they are not: isGeneric("graph") #FALSE Best, Vitalie. R version 2.13.0 Under development (unstable) (2011-02-11 r54330) Platform: i386-pc-mingw32/i386 (32-bit) locale: [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252 LC_MONETARY=English_United States.1252 LC_NUMERIC=C [5] LC_TIME=English_United States.1252 attached base packages: [1] grid stats datasets grDevices utils graphics methods base other attached packages: [1] Rgraphviz_1.29.0 graph_1.28.0 loaded via a namespace (and not attached): [1] tools_2.13.0