findAncestor {TreeSummarizedExperiment} | R Documentation

## Find the ancestors of specified nodes

### Description

`findAncestor` finds the ancestor in the nth generation above specified nodes.

### Usage

    findAncestor(tree, node, level, use.alias = FALSE)

### Arguments

`tree` | A phylo object
`node` | A vector of node numbers or node labels
`level` | A vector of numbers to define nth generation before the specified nodes
`use.alias` | A logical value, TRUE or FALSE. The default is FALSE, and the node label would be used to name the output; otherwise, the alias of node label would be used to name the output. The alias of node label is created by adding a prefix `"alias_"` to the node number.

### Value

A vector of nodes. The numeric value is the node number, and the vector name is the corresponding node label. If a node has no label, it would have NA as name when `use.alias = FALSE`, and have the alias of node label as name when `use.alias = TRUE`.

### Author(s)

Ruizhu Huang

### Examples

    library(ggtree)
    data(tinyTree)
    ggtree(tinyTree, branch.length = 'none') +
     geom_text2(aes(label = label), color = "darkorange",
               hjust = -0.1, vjust = -0.7) +
     geom_text2(aes(label = node), color = "darkblue",
                   hjust = -0.5, vjust = 0.7)

     findAncestor(tree = tinyTree, node = c(18, 13), level = 1)

[Package TreeSummarizedExperiment version 2.2.0 Index]