CODEWITHSUNDEEP
r
mickkk
mickkk

Reputation: 1192

Is there a smart way to catch a list with all elements set to integer(0) in R?

Suppose you have a list where each element is an integer(0). How can you catch this "error" in an effective way?

# Reproducible example
set.seed(10)
a <- list(a = as.factor(integer(0)), b = as.factor(sample(letters[1:5], 10, rep=T)))
levels(a$a) <- levels(a$b)
a$b <- as.factor(integer(0))
levels(a$b) <- levels(a$a)
a

# I know I can catch an integer(0) using length()
length(integer(0))

# But how can I check that all list elements are integer(0)???

The only case I'd like to catch is the one where all the elements of the list are integer(0).

Upvotes: 0

Views: 45

Answers (1)

Gregor Thomas
Gregor Thomas

Reputation: 146030

This will check that the length of every list element is 0:

all(lengths(a) == 0)

It won't differentiate between numeric(0), integer(0), character(0), etc.

If the integer part important, You might have some like in your example), but you could make another check: all(sapply(a, typeof) == "integer") if you only want integer(0)s.

Upvotes: 3

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