has_one_root: Has One Root
In ben519/btree: Binary Tree Wrangling

Helper method for validating a data.table object as a btree by checking for one root.

1	has_one_root(btree)

btree

A data.table object with field ParentNodeId

Returns TRUE if field ParentNodeId has exactly 1 NA value.

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2
3

library(data.table)
mytree <- data.table(NodeId=c(1, 2, 3), ParentNodeId=c(NA, 1, 1))
has_one_root(mytree)

ben519/btree documentation built on May 12, 2019, 10:56 a.m.

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