[R] conversion of data for use within barchart

From: Karin Lagesen <karinlag_at_studmed.uio.no>
Date: Wed, 02 Jul 2008 11:52:25 +0200

I have a data matrix like this:

> data[1:10,]

   aaname grp cluster count

1     Ala All Singleton   432
2     Arg All Singleton  1239
3     Asn All Singleton   396
4     Asp All Singleton   152
5     Cys All Singleton   206
6     Gln All Singleton   370
7     Glu All Singleton   211
8     Gly All Singleton   594
9     His All Singleton   213

10 Ile All Singleton 44

where the cluster column has three levels.

> levels(data$cluster)

[1] "Array" "Singleton" "rRNA"
>

Now, I would like to plot this like this:

barchart(aaname~count|grp, group = cluster, data = data, stack = TRUE)

I am thus using the cluster as the grouping.

I would like to plot the relative abundance within each grouping, such that the max level in my plot always is one (or 100). This would for instance mean for the Ala in the All grp that the Singleton cluster consitute lets say 40% of the Ala in the All grp, wheras the Singleton and rRNA makes up 20% each. In this case I would get in my plot a Singleton stretching to 40%, whereas the other two would be 20% each, all in all making 100%.

I am uncertain of whether I am managing to describe what I want, so I hope somebody understands what I want!

Thanks!

Karin

-- 
Karin Lagesen, PhD student
karin.lagesen_at_medisin.uio.no
http://folk.uio.no/karinlag

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Received on Wed 02 Jul 2008 - 12:26:18 GMT

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