[R] sort matrix by sum of columns

[john seers (IFR)]

Albert

Is this what you want?:

 a[,order(colSums(a))]


John S

 
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-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Albert Vilella
Sent: 21 June 2006 11:38
To: r help
Subject: [R] sort matrix by sum of columns


Hi all,

I would like to know how can I sort the cols of a matrix by the sum of
their elements.


a <- matrix(as.integer(rnorm(25,4,2)),10,5)
colnames(a) = c("alfa","bravo","charlie","delta","echo")

I guess I should use colSums, and then rearrange the matrix somehow
according to the result.

My idea is to display a "sorted" barplot:

barplot(a, horiz=TRUE, legend.text=T)

Thanks in advance,

    Albert.

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