R help - Jul 2007 - capture numeric(0) with if statement

Hi List,

I am trying to capture the numeric(0) with an if statement,
unsucessfully:

test<-numeric(0)

if(test == numeric(0)) print("test is", test)

I get: Error in if (test == numeric(0)) print("test is", test) : 
        argument is of length zero

How can I capture the numeric(0) condition?

Any enlightment appreciated
Cheers
Herry

> test <- numeric(0)
> length(test)
[1] 0
> if (length(test) == 0) print("length=0")
[1] "length=0"

Try:

if (identical(test, numeric(0))) ...

On 7/23/07, Alexander.Herr at csiro.au <Alexander.Herr at csiro.au>
wrote:
> Hi List,
>
> I am trying to capture the numeric(0) with an if statement,
> unsucessfully:
>
> test<-numeric(0)
>
> if(test == numeric(0)) print("test is", test)
>
> I get: Error in if (test == numeric(0)) print("test is", test) :
>        argument is of length zero
>
> How can I capture the numeric(0) condition?
>
> Any enlightment appreciated
> Cheers
> Herry
>
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