How can I check whether a function call results in a warning?

Question

In R, how can I determine whether a function call results in a warning?

That is, after calling the function I would like to know whether that instance of the call yi

Answer 1

here is an example:

testit <- function() warning("testit") # function that generates warning.

assign("last.warning", NULL, envir = baseenv()) # clear the previous warning

testit() # run it

if(length(warnings())>0){ # or !is.null(warnings())
    print("something happened")
}

maybe this is somehow indirect, but i don't know the more straightforward way.