print.tree: Show tree representation in dot format
In cbaumbach/treeFun: Functions for dealing with tree structures

Description Usage Arguments Details Value See Also Examples

Show tree representation in dot format

1 2	## S3 method for class 'tree' print(x, nodef = NULL, edgef = NULL, main = NULL, ...)

`x`	Tree object.
`nodef`	Function for printing node attributes in dot format.
`edgef`	Function for printing node attributes in dot format.
`main`	Title used for printed tree.
`...`	Ignored.

The ‘nodef’/‘edgef’ functions should print dot format node/edge attributes like ‘[label="node1"]’ to standard output. The ‘nodef’ function is called with two arguments: the current node id and a data frame. The ‘edgef’ function is called with three arguments: the id of the node where the edge starts (the parent node), the id of the node where the edge ends (the child node), and a data frame. In both cases, the data frame is the one that was used to construct the initial tree object (an ancestor of ‘tree’) using make_tree. Rows corresponding to nodes that are not in ‘tree’ were removed from the data frame. By default, nodes are labeled with their id and edges are drawn as arrows from parent to child without any label.

Produces a representation of the tree in dot format. Sometimes that is enough to give you an idea of what the tree looks like. Often, however, it's better to convert that representation into a picture using tools from the open source graph visualization software Graphviz (www.graphviz.org) and look at that instead (see tree2dot).

make_tree tree2dot

library(treeFun)

d <- read.table(textConnection("\
id parents label
0 - a
1 0 b
2 0 c
3 1 d
4 1 e
5 1 f
6 2 g
7 2 h
8 7 i
"), header = TRUE, stringsAsFactors = FALSE)

##         0a
##        / \
##      /     \
##    1b       2c
##   /|\      / \
##  / | \    /   \
## 3d 4e 5f 6g    7h
##                 \
##                  \
##                   8i

print(make_tree(d))