R help - May 2011 - for loop populate matrix

Dear List,
I am trying to populate a matrix using a for loop.This
works.
> four<- matrix(nrow=4,ncol=5)> for (j in 1:ncol(four)){+ for (i in
1:nrow(four)){+ four[i,j]<-i-1}+ }> print(four)? ? ?[,1] [,2] [,3] [,4]
[,5][1,] ? ?0 ? ?0 ? ?0 ? ?0 ? ?0[2,] ? ?1 ? ?1 ? ?1 ? ?1 ? ?1[3,] ? ?2 ? ?2 ?
?2 ? ?2 ? ?2[4,] ? ?3 ? ?3 ? ?3 ? ?3 ? ?3
What I would like is the inverse ofthe above, i.e.:	[,1] [,2] [,3] [,4] [,5][1,]
? ? 3 ? ?3 ? ?3 ? ?3 ? ?3[2,] ? ? 2 ? ?2 ? ?2 ? ?2 ? ?2[3,] ? ? 1 ? ?1 ? ?1 ? ?1
? ?1[4,] ? ? 0 ? ?0 ? ?0 ? ?0 ? ?0
and can't seem to get there. ?Thanks,Chris

Why loop?

matrix(rep(3:0, each = 5), ncol = 5, byrow = TRUE)
     [,1] [,2] [,3] [,4] [,5]
[1,]    3    3    3    3    3
[2,]    2    2    2    2    2
[3,]    1    1    1    1    1
[4,]    0    0    0    0    0

HTH,
Dennis

On Tue, May 10, 2011 at 11:10 AM, Chris English <sglish at hotmail.com>
wrote:
>
> Dear List,
> I am trying to populate a matrix using a for loop.This works.
>> four<- matrix(nrow=4,ncol=5)> for (j in 1:ncol(four)){+ for (i in
1:nrow(four)){+ four[i,j]<-i-1}+ }> print(four)? ? ?[,1] [,2] [,3] [,4]
[,5][1,] ? ?0 ? ?0 ? ?0 ? ?0 ? ?0[2,] ? ?1 ? ?1 ? ?1 ? ?1 ? ?1[3,] ? ?2 ? ?2 ?
?2 ? ?2 ? ?2[4,] ? ?3 ? ?3 ? ?3 ? ?3 ? ?3
> What I would like is the inverse ofthe above, i.e.: ? ? [,1] [,2] [,3] [,4]
[,5][1,] ? ? 3 ? ?3 ? ?3 ? ?3 ? ?3[2,] ? ? 2 ? ?2 ? ?2 ? ?2 ? ?2[3,] ? ? 1 ? ?1
? ?1 ? ?1 ? ?1[4,] ? ? 0 ? ?0 ? ?0 ? ?0 ? ?0
> and can't seem to get there. ?Thanks,Chris
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