Dear R,
I have two small questions confused me recently. Now assume I have a matrix
"a", like this,
> a <- matrix(1:6, 2, 3)
> a
[,1] [,2] [,3]
[1,] 1 3 5
[2,] 2 4 6
I sometimes need each row of "a" raised to a different exponent. So I do a
trick like this,
> a^c(2, 3)
[,1] [,2] [,3]
[1,] 1 9 25
[2,] 8 64 216
My first question is that if it is possible to do this trick column wise?
Just out of curiosity, of course I know there are other ways of doing this.
And the second question is why I get such result when I put another element
in the exponent part like this,
> a^c(2, 3, 4)
[,1] [,2] [,3]
[1,] 1 81 125
[2,] 8 16 1296
BTW, I have a 64bit R version (2.11) for Linux. Any advice would be
appreciated.
Feng
--
Feng Li
Department of Statistics
Stockholm University
106 91 Stockholm, Sweden
http://feng.li/
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