##' @import ape
drop_tip <- function(phy, tip, trim.internal = TRUE, subtree = FALSE,
root.edge = 0, rooted = is.rooted(phy)) {
if (length(tip) == 0L) {
return(phy)
}
if (!inherits(phy, "phylo")) {
stop("object \"phy\" is not of class \"phylo\"")
}
Ntip <- length(phy$tip.label)
if (is.character(tip)) {
tip <- which(phy$tip.label %in% tip)
}
if (!rooted && subtree) {
phy <- root(phy, (1:Ntip)[-tip][1])
root.edge <- 0
}
phy <- reorder(phy)
NEWROOT <- ROOT <- Ntip + 1
Nnode <- phy$Nnode
Nedge <- dim(phy$edge)[1]
if (subtree) {
trim.internal <- TRUE
tr <- reorder(phy, "pruningwise")
N <- node.depth(phy)
}
wbl <- !is.null(phy$edge.length)
edge1 <- phy$edge[, 1]
edge2 <- phy$edge[, 2]
keep <- !logical(Nedge)
if (is.character(tip)) {
tip <- which(phy$tip.label %in% tip)
}
if (!rooted && subtree) {
phy <- root(phy, (1:Ntip)[-tip][1])
root.edge <- 0
}
keep[match(tip, edge2)] <- FALSE
if (trim.internal) {
ints <- edge2 > Ntip
repeat {
sel <- !(edge2 %in% edge1[keep]) & ints & keep
if (!sum(sel))
break
keep[sel] <- FALSE
}
if (subtree) {
subt <- edge1 %in% edge1[keep] & edge1 %in% edge1[!keep]
keep[subt] <- TRUE
}
if (root.edge && wbl) {
degree <- tabulate(edge1[keep])
if (degree[ROOT] == 1) {
j <- integer(0)
repeat {
i <- which(edge1 == NEWROOT & keep)
j <- c(i, j)
NEWROOT <- edge2[i]
degree <- tabulate(edge1[keep])
if (degree[NEWROOT] > 1)
break
}
keep[j] <- FALSE
if (length(j) > root.edge)
j <- 1:root.edge
NewRootEdge <- sum(phy$edge.length[j])
if (length(j) < root.edge && !is.null(phy$root.edge))
NewRootEdge <- NewRootEdge + phy$root.edge
phy$root.edge <- NewRootEdge
}
}
}
if (!root.edge)
phy$root.edge <- NULL
phy$edge <- phy$edge[keep, ]
if (wbl)
phy$edge.length <- phy$edge.length[keep]
TERMS <- !(phy$edge[, 2] %in% phy$edge[, 1])
oldNo.ofNewTips <- phy$edge[TERMS, 2]
n <- length(oldNo.ofNewTips)
phy$edge[TERMS, 2] <- rank(phy$edge[TERMS, 2])
if (subtree || !trim.internal) {
tips.kept <- oldNo.ofNewTips <= Ntip & !(oldNo.ofNewTips %in%
tip)
new.tip.label <- character(n)
new.tip.label[tips.kept] <- phy$tip.label[-tip]
node2tip <- oldNo.ofNewTips[!tips.kept]
new.tip.label[!tips.kept] <- if (subtree) {
paste("[", N[node2tip], "_tips]", sep = "")
}
else {
if (is.null(phy$node.label))
rep("NA", length(node2tip))
else phy$node.label[node2tip - Ntip]
}
if (!is.null(phy$node.label))
phy$node.label <- phy$node.label[-(node2tip - Ntip)]
phy$tip.label <- new.tip.label
}
else phy$tip.label <- phy$tip.label[-tip]
if (!is.null(phy$node.label))
phy$node.label <- phy$node.label[sort(unique(phy$edge[,
1])) - Ntip]
phy$Nnode <- dim(phy$edge)[1] - n + 1L
## REMOVE:
## newNb <- integer(n + phy$Nnode)
## newNb[NEWROOT] <- n + 1L
## sndcol <- phy$edge[, 2] > n
## phy$edge[sndcol, 2] <- newNb[phy$edge[sndcol, 2]] <- (n +
## 2):(n + phy$Nnode)
## phy$edge[, 1] <- newNb[phy$edge[, 1]]
## REPLACE:
i <- phy$edge > n
phy$edge[i] <- match(phy$edge[i], sort(unique(phy$edge[i]))) + n
## DONE:
storage.mode(phy$edge) <- "integer"
collapse.singles(phy)
}
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