[R] class of 'try' if error is raised

[Bert Gunter]

See ?try which links you to ?tryCatch for the preferred approach.

Alternatively:  if(inherits(e, "try-error")) ....  ## should work and
satisfy CRAN

-- Bert


Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Sun, Dec 15, 2019 at 6:21 AM Hans W Borchers <hwborchers using gmail.com>
wrote:

> I have been informed by CRAN administrators that the development
> version of R issues warnings for my package(s). Some are easy to mend
> (such as Internet links not working anymore), but this one I don't
> know how to avoid:
>
>     Error in if (class(e) == "try-error") { : the condition has length > 1
>
> I understand that `class` can return more than one value. But what
> would be the appropriate way to catch an error in a construct like
> this:
>
>     e <- try(b <- solve(a), silent=TRUE)
>     if (class(e) == "try-error") {
>         # ... do something
>     }
>
> Should I instead compare the class with "matrix" or "array" (or
> both)?. That is, in each case check with a correct result class
> instead of an error?
>
> Thanks, HW
>
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