[R] is.na for S4 object

[Martin Morgan]

On 06/04/2015 10:08 AM, cgenolin wrote:
> Hi the list,
>
> I have a variable y that is either NA or some S4 object. I would like to
> know in which case I am, but it seems taht is.na does not work with S4
> object, I get a warnings:
>
> --- 8< ------------
> setClass("myClass",slots=c(x="numeric"))
> if(runif(1)>0.5){a <- new("myClass")}else{a <- NA}
> is.na(a)
> --- 8< ------------
>
> Any solution?

getGeneric("is.na")

shows that it's an S4 generic, so implement a method

setMethod("is.na", "myClass", function(x) FALSE)

Martin

> Thanks
>
> Christophe
>
>
>
>
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