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Convert a data.frame to a nested list for renderTree

Source: R/data.tree-conversion.R
dfToTree.Rd

Each column of hierarchy is one level of the tree, in that order: a node for each value of the first column, under it a node for each value of the second column found with it, and so on. A missing value ends the branch there, which is how treeToDf writes a branch shorter than the deepest one, so a tree survives the round trip. A row whose first column is missing is left out.

Usage

dfToTree(df, hierarchy = colnames(df))

Arguments

df

data.frame

hierarchy

ordered character vector of column names defining the hierarchy

Value

A named nested list, as renderTree takes; an empty list for a data frame with no rows.

See also

treeToDf, the 22-dfToTree example

Author

Jasper Schelfhout jasper.schelfhout@openanalytics.eu

Examples

df <- data.frame(Titanic)
tree <- dfToTree(df, c("Sex", "Class", "Survived"))
str(tree$Male$`1st`)
#> List of 2
#>  $ No : chr ""
#>  $ Yes: chr ""