help with one matrix

Gabor Grothendieck wrote:

On 9/10/05, Jose Claudio Faria <joseclaudio.faria at terra.com.br> wrote:

Dear R-list,

Could anybody tell me how to make one matrix as the below:

    [,1] [,2] [,3] [,4] [,5] [,6]
[1,]    -    2    3    4    5    6
[2,]    2    -    2    3    4    5
[3,]    3    2    -    2    3    4
[4,]    4    3    2    -    2    3
[5,]    5    4    3    2    -    2
[6,]    6    5    4    3    2    -

Assuming that - means NA

dd <- diag(NA, 6)
abs(col(dd) - row(dd)) + 1 + dd

or

abs(outer(1:6, 1:6, "-")) + 1 + diag(NA,6)

or

f <- function(x,y) ifelse(x==y, NA, abs(x-y)+1)
outer(1:6, 1:6, f)

Hi,

You are always solving (and teaching) my R doubts: thanks Gabor, very much!
Because I need one, I've been trying to make a more flexible function for
multiple comparison test of means (Tukey, SNK and Duncan). The matrix above is
necessary for SNK and Duncan tests. So, when running I will to sent it for you
for suggestions.