Is it intended that the first suffix can no longer be blank? Seems to be caused by a bug fix to merge in R 2.15.0.
$Rdevel --vanilla DF1 = data.frame(a=1:3,b=4:6) DF2 = data.frame(a=1:3,b=7:9) merge(DF1,DF2,by="a",suffixes=c("",".1")) Error in merge.data.frame(DF1, DF2, by = "a", suffixes = c("", ".1")) : there is already a column named b $R --vanilla R version 2.14.2 (2012-02-29) > DF1 = data.frame(a=1:3,b=4:6) > DF2 = data.frame(a=1:3,b=7:9) > merge(DF1,DF2,by="a",suffixes=c("",".1")) a b b.1 1 1 4 7 2 2 5 8 3 3 6 9 > Matthew ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel