X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=R%2Fis.ultrametric.R;h=ae4c43937ea6f08ea6a8cae0afcf7d40a684195a;hb=2419de65ffb4f7c45eb8c2448bcba3d0df64744f;hp=476c229c0d46045dafa53e94e176d2d0bec4bc4b;hpb=c827059eeafc8cbe41c812b26979543ab287803e;p=ape.git

diff --git a/R/is.ultrametric.R b/R/is.ultrametric.R
index 476c229..ae4c439 100644
--- a/R/is.ultrametric.R
+++ b/R/is.ultrametric.R
@@ -1,19 +1,19 @@
-## is.ultrametric.R (2007-12-18)
+## is.ultrametric.R (2009-05-10)
 
 ##   Test if a Tree is Ultrametric
 
-## Copyright 2003-2007 Emmanuel Paradis
+## Copyright 2003-2009 Emmanuel Paradis
 
 ## This file is part of the R-package `ape'.
 ## See the file ../COPYING for licensing issues.
 
 is.ultrametric <- function(phy, tol = .Machine$double.eps^0.5)
 {
-### the tree must be in cladewise order
-    if (class(phy) != "phylo")
+    if (!inherits(phy, "phylo"))
       stop('object "phy" is not of class "phylo".')
     if (is.null(phy$edge.length))
       stop("the tree has no branch lengths.")
+    phy <- reorder(phy)
     n <- length(phy$tip.label)
     n.node <- phy$Nnode