OKKK
Thanks a lot for letting me know the subset function
Cheers
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On Feb 22, 2010, at 8:45 AM, statquant wrote:
Hello Sarah, thanks for answering
For example if I have the following example
test <- as.data.frame(matrix(c(1,2,3,4, 11,12,13,14,
"a","b","b","c"), nrow
= 3, ncol=3,dimnames = list(c("r1","r2","r3","r4"),NULL))
This is a malformed example. S
Hello Sarah, thanks for answering
For example if I have the following example
test <- as.data.frame(matrix(c(1,2,3,4, 11,12,13,14, "a","b","b","c"), nrow
= 3, ncol=3,dimnames = list(c("r1","r2","r3","r4"),NULL))
V1 V2 V3
r1 1 11 a
r2 2 12 b
r3 3 13 b
r4 4 14 c
it is easy to select
Hi Colin,
You'll get a better answer if you provide an actual example, including what
you tried that didn't work. It looks to me like you want to subset a
data frame based
on column names, though I'm not sure what A(i, J) is supposed to be.
if so, then this is one approach:
> A <- data.frame(A =
hello all,
thank you for taking the time
I have a matrix A that have column names (let say n columns), I want to
reduce the matrix to have just a few of those column (p colums, this is
trivial), but for the lines I want only the lines such that A(i,J) is part
of a list (J is fixed and known)
I a
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