ch
>
> > -Original Message-
> > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-
> > project.org] On Behalf Of Tal Galili
> > Sent: Tuesday, 9 November 2010 10:10 a.m.
> > To: r-help@r-project.org
> > Subject: [R] Help with getting ?match to n
f Of Tal Galili
> Sent: Tuesday, 9 November 2010 10:10 a.m.
> To: r-help@r-project.org
> Subject: [R] Help with getting ?match to not sort
>
> Hello all,
>
> I think I am missing something about the sorting parameter in the
> "match"
> command/
> Here is an
Ted -
If you want to retain the exact order of the rows of one
of the merged matrices, I think you have to merge them
"by hand":
cbind(a1,num=a2[match(a1$name,a2$name),'num'])
name num
1D 4
2B 2
3C 3
4A 1
5A 1
6C 3
Missing: a closer reading of the help page --
Value
A data frame. The rows are by default lexicographically sorted on the
common columns, but for sort = FALSE are in an unspecified order.
So sort = FALSE says unspecified. If you want the original order,
then add a column to the dataframe with th
Hello all,
I think I am missing something about the sorting parameter in the "match"
command/
Here is an example:
a1 <- data.frame(name = c("D", "B", "C", "A", "A", "C"))
a2 <- data.frame(name = c("A", "B", "C", "D"), num = 1:4)
a1
a2
merge(a1, a2, sort = F, by.x = T)
The result is:
name n
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