automatic completion of object names
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: require(car) data(Mroz) 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 argument." (I'm using R2.14.2 ... further evidence this is not new in 2.15.x) > summary(Mroz$w) no yes 541 212
David Winsemius, MD West Hartford, CT