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## unique.multiPhylo.R (2021-12-19)
## Revomes Duplicate Trees from a List
## Copyright 2007-2021 Emmanuel Paradis
## This file is part of the R-package `ape'.
## See the file ../COPYING for licensing issues.
unique.multiPhylo <-
function(x, incomparables = FALSE,
use.edge.length = FALSE,
use.tip.label = TRUE, ...)
{
n <- length(x)
## fixed by Martin:
if (n == 0L) return(x)
if (n == 1L) return(structure(x, old.index = 1L))
keep <- 1L
old.index <- seq_len(n)
for (i in 2:n) {
already.seen <- FALSE
for (j in keep) {
if (all.equal(x[[j]], x[[i]],
use.edge.length = use.edge.length,
use.tip.label = use.tip.label)) {
already.seen <- TRUE
old.index[i] <- j
break
}
}
if (!already.seen) keep <- c(keep, i)
}
res <- x[keep]
attr(res, "old.index") <- old.index
res
}
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