Message-ID: <da79af330809261443w30c62941rd6a353db4a07bc4b@mail.gmail.com>
Date: 2008-09-26T21:43:06Z
From: Henrique Dallazuanna
Subject: Newbie: Ranking a data frame, grouped by 2 or more columns
In-Reply-To: <82ba77b80809261354q47c21a64rb6ee185e28e6339a@mail.gmail.com>
Try this:
DF
V1 V2 V3
1 a w 200
2 a w 100
3 b w 500
4 b w 200
5 b z 300
6 b z 400
DF$rank <- unlist(lapply(split(DF$V3, list(DF$V1, DF$V2), drop = T), rank))
On Fri, Sep 26, 2008 at 5:54 PM, Matthew Pettis
<matthew.pettis at gmail.com> wrote:
> Hi,
>
> I'd like to rank obs in a data frame as subset by 2 or more columns...
> The example input would look like the following:
>
> ====+====+====+====+
> x y v
> -- -- --
> a w 200
> a w 100
> b w 500
> b w 200
> b z 300
> b z 400
> ====+====+====+====+
>
> And the data frame I want to create is below:
> ====+====+====+====+
> x y v rank
> -- -- -- ----
> a w 200 1
> a w 100 2
> b w 500 1
> b w 200 2
> b z 300 2
> b z 400 1
> ====+====+====+====+
>
> Can someone help me with this?
>
> Thanks,
> Matt
> --
> It is from the wellspring of our despair and the places that we are
> broken that we come to repair the world.
> -- Murray Waas
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O