assertthat

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The x is a matrix, the error message still refers to a vector.

library(assertthat)
x <- matrix(1:4, ncol = 2)
is.numeric(x) # returns TRUE
assert_that(is.numeric(x)) # returns TRUE
x <- matrix(letters, ncol = 2)
is.numeric(x) # returns FALSE
assert_that(is.numeric(x)) # returns error "Error: x is not a numeric or integer vector"

@ThierryO I'm looking through assertthat issues today. Bet you forgot by now that you even wrote this one!

IMHO what you've reported is not actually a bug. base::is.numeric literally tests whether the thing you pass to is it a numeric/integer vector. This assertion fails for exactly the reason stated...you passed it an object full of numbers that is not a vector.

Does that make sense?

@hadley I think we can close this issue