R devel - Jul 2013 - cbind error with check.names

Here is an example where?cbind?fails with an error when?check.names=TRUE?is set.

data(airquality)
airQualityBind =cbind(airquality,airquality,check.names =TRUE)


?I understand that?cbind?is a call to?data.frame?and the following works:
airQualityBind =data.frame(airquality,airquality,check.names =TRUE)
but I would like to understand why?cbind?throws an error.

I asked this question on SO here:
http://stackoverflow.com/questions/17810470/cbind-error-with-check-names
and user?Hong Ooi?confirmed my suspicion that cbind was passing check.names =
FALSE regardless of my setting that option, even though the help file indicates
that this should be possible,?

"For the "data.frame" method of cbind these can be further
arguments to data.frame such as stringsAsFactors."

Is there some design principle that I am missing here?

Thanks.

On Tue, Jul 23, 2013 at 9:18 AM, Fg Nu <fgnu32 at yahoo.com>
wrote:
>
>
>
> Here is an example where cbind fails with an error when check.names=TRUE is
set.
>
> data(airquality)
> airQualityBind =cbind(airquality,airquality,check.names =TRUE)
>
>
>  I understand that cbind is a call to data.frame and the following works:
> airQualityBind =data.frame(airquality,airquality,check.names =TRUE)
> but I would like to understand why cbind throws an error.
>
> I asked this question on SO here:
> http://stackoverflow.com/questions/17810470/cbind-error-with-check-names
> and user Hong Ooi confirmed my suspicion that cbind was passing check.names
= FALSE regardless of my setting that option, even though the help file
indicates that this should be possible,
>
> "For the "data.frame" method of cbind these can be further
arguments to data.frame such as stringsAsFactors."
>
> Is there some design principle that I am missing here?

Well, the function does work as documented. See the help file section
on "Data frame methods", which says "The 'cbind' data
frame method is
just a wrapper for 'data.frame(..., check.names = FALSE)'".

Best,
Ista

>
>
> Thanks.
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel