Hi, All; I tried to plot a dendrogram horizontally using following codes: hc.g <- hclust(dist(mat), method="single") plot(as.dendrogram(hc.g), horiz=T, ...) While I was trying this (single linkage was IMPORTANT) with a matrix with size 587 rows, an error happened with a message saying [1] "Error in match.fun(FUN) : evaluation nested too deeply: infinite recursion options(expression=)?\n" attr(,"class") [1] "try-error" If I used other linkage methods, this error didn't happen. Only for single linkage method, this error took place. Is there any other way I can plot dendrogram horizontally without using as.dendrogram? Thanks in advance, Tae-Hoon Chung -------------------------------------------------- Tae-Hoon Chung Post-Doctoral Researcher Translational Genomics Research Institute (TGen) 445 N. 5th Street (Suite 530) Phoenix, AZ 85004 1-602-343-8724 (Direct) 1-480-323-9820 (Mobile) 1-602-343-8840 (Fax)