prune_depth: Prune a tree up to a specified depth.
In autoharp: Semi-Automatic Grading of R and Rmd Scripts

Description Usage Arguments Details Value See Also Examples

Prunes a tree up to a depth specified by a set of node names.

1	prune_depth(th, names_to_keep)

`th`	A TreeHarp object.
`names_to_keep`	The node names to keep in the pruned tree.

This is a seldom used function. It works in this way. Given a set of node names, it identifies the node with the greatest depth in that set. The function then returns the sub-tree, that contains all the nodes with a depth smaller than or equal to that depth. If the node types slot is not NA, then that data frame is filtered and returned too.

Take a look at the examples for a clearer picture.

An object of class TreeHarp.

carve_subtree, path_to_root, carve_mst

ex1 <- quote(x <- f(y, g(5)))
th1 <- TreeHarp(ex1, TRUE)
s1 <- prune_depth(th1, c("f", "y"))
s2 <- prune_depth(th1, c("f", "z")) # node not present!
plot(s1)
plot(s2)