recipes (version 0.1.4)

names0: Naming Tools

Description

names0 creates a series of num names with a common prefix. The names are numbered with leading zeros (e.g. prefix01-prefix10 instead of prefix1-prefix10). dummy_names can be used for renaming unordered and ordered dummy variables (in step_dummy()).

Usage

names0(num, prefix = "x")
dummy_names(var, lvl, ordinal = FALSE, sep = "_")

Arguments

num

A single integer for how many elements are created.

prefix

A character string that will start each name.

var

A single string for the original factor name.

lvl

A character vectors of the factor levels (in order). When used with step_dummy(), lvl would be the suffixes that result after model.matrix is called (see the example below).

ordinal

A logical; was the original factor ordered?

sep

A single character value for the separator between the names and levels.

Value

names0 returns a character string of length num and dummy_names generates a character vector the same length as lvl,

Examples

# NOT RUN {
names0(9, "x")
names0(10, "x")

example <- data.frame(y = ordered(letters[1:5]),
                      z = factor(LETTERS[1:5]))

dummy_names("z", levels(example$z)[-1])

after_mm <- colnames(model.matrix(~y, data = example))[-1]
after_mm
levels(example$y)

dummy_names("y", substring(after_mm, 2), ordinal = TRUE)
# }

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