Unlistable Lists

A (nested) list with atomic objects in all final nodes of the list-tree is unlistable - checked with is_unlistable.

is_unlistable(l, DF.as.list = FALSE)

Arguments

l

a list.

DF.as.list

logical. TRUE treats data frames like (sub-)lists; FALSE like atomic elements.

Details

is_unlistable with DF.as.list = TRUE is defined as all(rapply(l, is.atomic)), whereas DF.as.list = FALSE yields checking using all(unlist(rapply2d(l, function(x) is.atomic(x) || is.list(x)), use.names = FALSE)), assuming that data frames are lists composed of atomic elements. If l contains data frames, the latter can be a lot faster than applying is.atomic to every data frame column.

Value

logical(1) - TRUE or FALSE.

See also

ldepth, has_elem, List Processing, Collapse Overview

Examples

l <- list(1, 2, list(3, 4, "b", FALSE))
is_unlistable(l)
#> [1] TRUE
l <- list(1, 2, list(3, 4, "b", FALSE, e ~ b))
is_unlistable(l)
#> [1] FALSE