vlmctree: Compute the tree structure of a "vlmc" object

Description

Compute the tree representation of a "vlmc" object as R list.

Usage

vlmctree(x)
# S3 method for vtree
str(object, …)
.vvec2tree(vv, k, chk.lev)

Arguments

x,object

typically the result of vlmc(..).

integer vector encoding the fitted vlmc, typically x$vlmc.vec[-1].

integer, the alphabet size.

chk.lev

integer internally used for consistency checking.

…

further arguments passed to or from methods.

Value

A list of class "vtree" representing the tree structure recursively.

Each ``node'' of the tree is itself a list with components

level

length-2 integer giving the level in {0,1,…}, counted from the root (which is 0) and the parenting level, i.e the longest branch.

count

integer vector of length k where k is the number of ``letters'' in the alphabet.

total

equals to sum(* $ count).

child

a list (of length k) of child nodes or NULL (i.e. not there).

Details

.vvec2tree is the internal (recursive) function building up the tree.

str.vtree is a method for the generic str function and typically for the output of vlmctree(). For each node, it gives the ``parenting level'' in braces and the counts.

Examples

Run this code

# NOT RUN {
data(presidents)
dpres <- cut(presidents, c(0,45,70, 100)) # three values + NA
table(dpres <- factor(dpres, exclude = NULL)) # NA as 4th level

(vlmc.prc1 <- vlmc(dpres, cut = 1, debug = TRUE))
str(vv.prc1 <- vlmctree(vlmc.prc1))
# }