[R] automatic completion of object names
dwinsemius at comcast.net
Fri Jul 6 16:32:05 CEST 2012
On Jul 6, 2012, at 9:36 AM, knallgrau at gmx.com wrote:
> Hello there,
> I just upgraded to R 2.15 (from R 2.12) on a Windows XP machine and
> noticed some puzzling behaviour (that in my opinion did not exist in
> R 2.12).
> It is possible now to call objects without spelling out the full
> object name. R now seems to use that (unique) object which shares
> the same beginning of the called object, even though the originally
> called object might not even exist.
> This is quite awkwardly described, but perhaps you know what I'm
> talking about?
> Let's say I'm using the Mroz data supplied with the car package:
> there is no variable called "w" in that dataframe, but calling
> summary(Mroz$w) #### Mroz$w does not exist
> does not return any error but instead gives the same result as
> summary(Mroz$wc) ##### exists in Mroz
> I find this behaviour *very* undesirable. Is there any way to switch
> it off?
It has always been the case. See the ?Extract page. The controlling
sentence is here>
" x$name is equivalent to x[["name", exact = FALSE]]. Also, the
partial matching behavior of[[ can be controlled using the exact
(I'm using R2.14.2 ... further evidence this is not new in 2.15.x)
David Winsemius, MD
West Hartford, CT
More information about the R-help