I was surprised by:
> test <- matrix( as.character(1:4), 2)
> test
[,1] [,2]
[1,] "1" "3"
[2,] "2" "4"
> apply(test, 1, paste, sep="+")
[,1] [,2]
[1,] "1" "2"
[2,] "3" "4"
> apply(test, 1, paste, sep="*")
[,1] [,2]
[1,] "1" "2"
[2,] "3" "4"
> te <- matrix(1:4, 2)
> te
[,1] [,2]
[1,] 1 3
[2,] 2 4
> apply(te, 1, sum)
[1] 4 6
Why doesn't paste behave in apply as sum?
Kjetil
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