[Rd] merge bug fix in R 2.15.0

[Matthew Dowle]

Anyone?

> 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
>