Take a look at your data. When I loaded what you attached, there were only
9 species that were in common across the two files:
> dim(s16)
[1] 226 83
> dim(s15)
[1] 96 41
> sum(s15$species %in% s16$species)
[1] 10
> sum(s16$species %in% s15$species)
[1] 10
> length(intersect(s16$species, s15$spec
Below , in line
John Kane
Kingston ON Canada
> -Original Message-
> From: michael.eisenr...@gmx.ch
> Sent: Thu, 14 Mar 2013 11:51:49 +0100
> To: r-help@r-project.org
> Subject: [R] merge function to combine two tables
>
> Dear R-help members
>
> I would
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