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2004 Jul 28
6
elegant matrix creation
Hello everybody.
I am trying to reproduce a particular matrix in an elegant way. If I
have
jj1 <-
structure(c(1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,
3,1,2,3,1,2,3,1,2,3,2,3,1,2,3,1,2,3,1,2,3,
1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,3,1,2,3,1,
2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,
2),.Dim = as.integer(c(9,9)))
[ image(jj1) is good here ] then I can get this with
2009 Apr 29
3
selecting ith rows of a matrix
Hi all,
If I have a huge matrix/ dataframe and I want to create a new matrix/
dataframe with every second (or third, or fourth etc.) row of the original
matrix, how can I do it? Any help much appreciated.
Thanks,
Umesh
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