[R] How to plot a matrix

From: ss <affysnp_at_gmail.com>
Date: Sun, 01 Jun 2008 13:41:23 -0400

Hi list,

If I have a matrix,

> a<-read.table("a.txt",header=TRUE,row.names=1)
> dim(a)
[1] 4 3
> a

   x y z
a1 1 6 3
a2 2 6 3
a3 2 3 8
a4 5 3 4

Can you suggest how to produce a plot like the one attached here? Basically, I want to plot each sample (each column) using the dots one by one and also have the average value of each column indicated?

Thank you so much and have a wonderful weekend!


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