[R] how to check a R object's property

Benilton Carvalho bcarvalh at jhsph.edu
Tue Nov 14 21:28:12 CET 2006

check class()

but if all you want is to test whether it's a data.frame or not:



On Nov 14, 2006, at 3:07 PM, Weiwei Shi wrote:

> Hi,
> I am writing a generic function and need to check if an arg is a data
> frame or not. I could use
> is.null(dim(x)) to get what i want. But i want to know if there is a
> function which can tell me whether it is a list, a numeric vector, a
> data frame, a factor and so on. Can R do that?
> thanks.
> --  
> Weiwei Shi, Ph.D
> Research Scientist
> GeneGO, Inc.
> "Did you always know?"
> "No, I did not. But I believed..."
> ---Matrix III
> ______________________________________________
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