and you might want to check ?prop.table
> prop.table(a, 2)
[,1] [,2]
[1,] 0.0 0.3333333
[2,] 0.5 0.3333333
[3,] 0.5 0.3333333
or even ?sweep (which will be useful for more complex situations)
> sweep(a, 2, colSums(a), "/")
[,1] [,2]
[1,] 0.0 0.3333333
[2,] 0.5 0.3333333
[3,] 0.5 0.3333333
b
On Mar 7, 2008, at 5:32 PM, Alexey Shipunov wrote:
Dear list,
I just made a very simple mistake, but it was hard to spot. And I
think that I should warn other people, because it is probably so
simple to make...
=== R code ===
# Let us create a matrix:
(a <- cbind(c(0,1,1), rep(1,3)))
# [,1] [,2]
# [1,] 0 1
# [2,] 1 1
# [3,] 1 1
# That is a MISTAKE:
a/colSums(a)
# [,1] [,2]
# [1,] 0.0000000 0.3333333
# [2,] 0.3333333 0.5000000
# [3,] 0.5000000 0.3333333
# I just wonder if some R warning should be issued here?
# That is what I actually needed (column-wise frequencies):
t(t(a)/colSums(a))
# [,1] [,2]
# [1,] 0.0 0.3333333
# [2,] 0.5 0.3333333
# [3,] 0.5 0.3333333
=== end of R code ===
With best wishes and regards,
Alexey Shipunov
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
