[R] R Experts

[Paul Hiemstra]

Hi,

Maybe the R version Ryan is using is very old?

cheers,
Paul

Erik Iverson wrote:
>
>
> Ryan Kinzer wrote:
>> Erik
>>
>> Thanks for helping.  Both of them are factors.
>>
>
> That's the problem, they need to be of class Date.  See the R NEWS 
> article about Date classes in Volume 4/1.
>
> http://cran.r-project.org/doc/Rnews/
>
> I don't see how they could be factors though, since you shouldn't be 
> able to subtract two factors from each other without a warning at least?
>
> e.g., when I make up factors f1  and f2
>
> >f1 - f2
>
> <snip>
>
> Warning message:
> In Ops.factor(f1, f2) : - not meaningful for factors
>
> We would have to have a small, reproducible example to know for sure 
> what's going on...
>
> Best Regards,
> Erik
>
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-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
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