```
#' Node to tips zero distance.
#'
#' Identify tips within zero distance of internal node
#' @param subtree Subtree that is made by the main script
#' @param igraph.tree a tree converted into graph format by igraph
#' @param node that is the root of the subtree
#' @param tree Newick formatted ACCTRANS tree
#' @param ntips Number of isolates on the phylogenetic tree
tips_node_zero_dist <- function(node, subtree, igraph.tree, tree, ntips){
# Retrieve tips under said node
tips_under_node <- subtree[which(subtree <= ntips)]
# Create empty vector for storage
tips_zero_distance <- rep(0, length(tips_under_node))
interation_0dist_vector <- 0
# Distances of tips from node
for (x in tips_under_node){
tip <- as.numeric(as.character(x))
node_tip_dist <- get_path_distance(igraph.tree,
node,
tip,
tree)
# Store the tips that have a zero distance into a vector
if (node_tip_dist == 0){
interation_0dist_vector <- interation_0dist_vector + 1
tips_zero_distance[interation_0dist_vector] <- tip
}
}
# Clearing elements in the vector that are zero
tips_zero_distance <- tips_zero_distance[tips_zero_distance != 0]
return(tips_zero_distance)
}
```

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