Full_Name: Edward McNeil Version: 2.5.0 OS: Windows XP Submission from: (NULL) (203.170.234.5) This is a new bug introduced to R2.5.0. Scenario: If one of the data frames to merge contains two variables that have the same name, then the data in first variable (of the same name) is copied to the second variable in the resulting merged data frame. In R2.4.1, the second variable name is automatically renamed (in the resulting data frame) by adding ".1" to the end. R2.5.0 doesn't seem to do this anymore.
On Mon, 21 May 2007, edward.m at psu.ac.th wrote:> Full_Name: Edward McNeil > Version: 2.5.0 > OS: Windows XP > Submission from: (NULL) (203.170.234.5) > > > This is a new bug introduced to R2.5.0. > > Scenario: If one of the data frames to merge contains two variables that have > the same name, then the data in first variable (of the same name) is copied to > the second variable in the resulting merged data frame.This is probably o <a data.frame>[i, j] could sometimes select the wrong column when j is numeric if there are duplicate column names. from NEWS and hence already fixed in R-patched.> In R2.4.1, the second variable name is automatically renamed (in the resulting > data frame) by adding ".1" to the end. R2.5.0 doesn't seem to do this anymore.This is not reproducible: A <- data.frame(x=1:3, y=4:6, y=7:9, check.names=FALSE) B <- data.frame(x=1:3, a=3:1) merge(A, B) works correctly in R-patched. You were asked for a reproducible example: if you have one in current R-patched, please supply it now (using PR#9699 early in your subject line). -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
Yes, it appears to have been resolved in R2.5.0pat, although the counter-example provided *does* fail in R2.5.0. A <- data.frame(x=1:3, y=4:6, y=7:9, check.names=FALSE) B <- data.frame(x=1:3, a=3:1) A x y y 1 1 4 7 2 2 5 8 3 3 6 9 B x a 1 1 3 2 2 2 3 3 1 merge(A, B) x y y.1 a 1 1 4 4 3 2 2 5 5 2 3 3 6 6 1 --- Prof Brian Ripley wrote:> On Mon, 21 May 2007, edward.m at psu.ac.th wrote: > >> Full_Name: Edward McNeil >> Version: 2.5.0 >> OS: Windows XP >> Submission from: (NULL) (203.170.234.5) >> >> >> This is a new bug introduced to R2.5.0. >> >> Scenario: If one of the data frames to merge contains two variables >> that have >> the same name, then the data in first variable (of the same name) is >> copied to >> the second variable in the resulting merged data frame. > > This is probably > > o <a data.frame>[i, j] could sometimes select the wrong column > when j is numeric if there are duplicate column names. > > from NEWS and hence already fixed in R-patched. > >> In R2.4.1, the second variable name is automatically renamed (in the >> resulting >> data frame) by adding ".1" to the end. R2.5.0 doesn't seem to do this >> anymore. > > This is not reproducible: > > A <- data.frame(x=1:3, y=4:6, y=7:9, check.names=FALSE) > B <- data.frame(x=1:3, a=3:1) > merge(A, B) > > works correctly in R-patched. You were asked for a reproducible > example: if you have one in current R-patched, please supply it now > (using PR#9699 early in your subject line). > >-- This message has been scanned for viruses and\ dangerous con...{{dropped}}