[R] Help with getting ?match to not sort

[jim holtman]

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 the order and then sort the
result.

On Mon, Nov 8, 2010 at 4:09 PM, Tal Galili <tal.galili at gmail.com> wrote:
> 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 num
> 1    D   4
> 2    B   2
> 3    C   3
> 4    C   3
> 5    A   1
> 6    A   1
>
>
> While I wish my rows to be in the same order as in a1, they are having some
> other order.
>
> What am I missing here?
>
>
> Thanks.
>
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?