A better plot function for GMYC result

I have received some emails and comments about the plotting function of the splits package. The plot.gmyc lacks some options. It cannot change the font size of the sample names, colors of tips, size of margins and so on. Surely, these options are important for the presentation of results. I have been thinking of updating the function, but its code is a mixture of codes written by several people and disentangling them appears a bit laborious.

So, for now, I upload a new version of the plot function.

plot.result <- function(res, cex=0.5, edge.width=1, no.margin=F, show.tip.label=T, label.offset=0) {
	plot.tree <- function(tr, mrca, cex=0.5, edge.width=1, no.margin=F, show.tip.label=T, label.offset=0) {
		traverse.subtree <- function(tr, n=1) {
			numtip <- length(tr$tip.label)
			sub.node <- tr$edge[which(tr$edge[,1] == n+numtip), 2]

			res.node <- c()
			for (sn in sub.node) {
				res.node <- c(res.node, sn)
				res.node <- c(res.node, traverse.subtree(tr, sn-numtip))
			return (res.node)

		numtip <- length(tr$tip.label)
		br.col <- rep(1, length(tr$edge.length))

		for (i in mrca) {
			for (j in traverse.subtree(tr, i-numtip)) {
				br.col[which(tr$edge[,2]==j)] <- 2


		plot(tr, edge.color=br.col, show.tip.label=show.tip.label, cex=cex, edge.width=edge.width, no.margin=no.margin, label.offset=label.offset)

	plot.tree(res$tree, res$MRCA[[which.max(res$likelihood)]]+length(res$tree$tip.label), cex=cex, edge.width=edge.width, no.margin=no.margin, show.tip.label=show.tip.label, label.offset=label.offset)

This plot function accepts the common options of the ape’s plot.phylo function, including cex, edge.width, etc.

You can change the color of edges by replacing “2” at the end of line 20 with another number or a color name. For instance,

br.col[which(tr$edge[,2]==j)] <- "blue" 

This makes branch colors blue.

The function can be used like the old plot function, and it should be more flexible than the old one.

 >res <- gmyc(test.tr)
>plot.result(res, no.margin=T, cex=0.3, edge.width=1.5)


3 thoughts on “A better plot function for GMYC result

  1. Jasper Obico

    Hello Tomochika,
    Thank you sharing the script to improve the plot. I’m really new to R. I would like to know if there’s a way to improve the node labels , for example, the way the support values look like? Mine looks cluttered because they’re overlapping. Thanks for the time!

    Best, Jasper

    1. t.fujisawa Post author

      Hi Jasper,

      You can change the size of labels by using “cex” argument like,

      plot(tr, cex=0.7, show.node.label=T)

      You can also use function like “round” to fix the cluttered plot. It rounds the number to a specified number of digit.

      Best regards,


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s