Extract.factor

From base v3.6.1 by R-core R-core@R-project.org

Extract or Replace Parts of a Factor

Extract or replace subsets of factors.

Keywords: category

Usage

# S3 method for factor
[(x, …, drop = FALSE)
# S3 method for factor
[[(x, …)
# S3 method for factor
[(x, …) <- value
# S3 method for factor
[[(x, …) <- value

Arguments

x: a factor
…: a specification of indices -- see Extract.
drop: logical. If true, unused levels are dropped.
value: character: a set of levels. Factor values are coerced to character.

Details

When unused levels are dropped the ordering of the remaining levels is preserved.

If value is not in levels(x), a missing value is assigned with a warning.

Any contrasts assigned to the factor are preserved unless drop = TRUE.

The [[ method supports argument exact.

Value

A factor with the same set of levels as x unless drop = TRUE.

Examples

library(base)

# NOT RUN {
## following example(factor)
(ff <- factor(substring("statistics", 1:10, 1:10), levels = letters))
ff[, drop = TRUE]
factor(letters[7:10])[2:3, drop = TRUE]
# }

Documentation reproduced from package base, version 3.6.1, License: Part of R 3.6.1

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