[R] sort matrix by sum of columns

Albert Vilella avilella at gmail.com
Wed Jun 21 12:38:17 CEST 2006

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,


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