Re: [R] simple matrix question

[Paul Lemmens]

Hoi Christoph,

--On woensdag 4 juni 2003 15:21 +0200 Christoph Lehmann 
<[EMAIL PROTECTED]> wrote:

what is the easiest way to get from
x
     x1 x2
[1,]  2  3
[2,]  3  2
[3,]  1  3
[4,]  1  4
xbar1
       x1 x2
[1,] 1.75  3
[2,] 1.75  3
[3,] 1.75  3
[4,] 1.75  3
with the mean of the columns of x as values?

xbar1 <- tapply(as.vector(x), gl(2,4), mean);



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Paul Lemmens
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