[R] sort matrix by sum of columns

From: Albert Vilella <avilella_at_gmail.com>
Date: Wed 21 Jun 2006 - 20:38:17 EST


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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