subtree_at: Extract a sub-tree.

In autoharp: Semi-Automatic Grading of R and Rmd Scripts

Extract a sub-tree.

Description

Extracts a sub-tree rooted at a particular node.

Usage

subtree_at(obj, at_node, preserve_call = FALSE)

Arguments

obj	An object of class TreeHarp
at_node	The root of the new sub-tree. An integer, not a label, that corresponds to BFS indexing of the tree.
preserve_call	A logical value that indicates if a sub-call should be extracted. This might be slower, but it allows you to evaluate it later.

Details

This is meant for internal use, so the nodeTypes slot is silently dropped, unless preserve_call is set to TRUE

Value

An object of class TreeHarp.

Examples

th3 <- list(a= c(2L,3L,4L), b=NULL, c=c(5L, 6L), d=7L, e=NULL, f=NULL, g=NULL)
subtree_at(TreeHarp(th3), 3)
st <- subtree_at(TreeHarp(th3), 4)
plot(st)

autoharp documentation built on April 3, 2025, 6:36 p.m.