is.atomic(x) is.recursive(x)
is.atomic
returns TRUE
if x
does not have a list structure and FALSE
otherwise.
is.recursive
returns TRUE
if x
has a recursive
(list-like) structure and FALSE
otherwise.
is.list
, is.language
, etc, and the
demo("is.things")
.is.a.r <- function(x) c(is.atomic(x), is.recursive(x)) is.a.r(c(a=1,b=3))# TRUE FALSE is.a.r(list()) # FALSE TRUE ?? is.a.r(list(2)) # FALSE TRUE is.a.r(lm) # " is.a.r(y ~ x) # " is.a.r(expression(x+1))# should be F-T (not in 0.62.3!)