unlist {base}R Documentation

Flatten Lists

Description

Given a list structure x, unlist produces a vector which contains all the atomic components which occur in x.

Usage

unlist(x, recursive = TRUE, use.names = TRUE)

Arguments

x A list.
recursive logical. Should unlisting be applied to list components of x?
use.names logical. Should names be preserved?

Details

If recursive=FALSE, the function will not recurse beyond the first level items in x.

By default, unlist tries to retain the naming information present in x. If use.names = FALSE all naming information is dropped.

See Also

c, as.list.

Examples

unlist(options())
unlist(unlist(options(), use.names=F))# works for vectors or lists
l.ex <- list(a = list(1:5, LETTERS[1:5]), b = "Z", c = NA)
unlist(l.ex, rec = F)
unlist(l.ex, rec = T)
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