On Jun 3, 2009, at 6:21 PM, tsunhin wong wrote:
Dear R users,
I know how to select a subset of a data.frame or a matrix by setting
some criteria, but this time, I have a long index of cases not really
related to 1 or 2 criteria.
And I cannot find a simple way to select cases from another data.frame
based on this index (sublst in this example).
sublst<-unique(g[comp.lst[[2]],]$Subject)
sublst
[1] 19 20 21 22 23 24 25 26 27 28 29 31 32 33 34 35 36 37 38 39 41 42
43 44 45 46 47 48 49
[30] 50 51 52 53 54 55 56 57 58 59 60 62 63 64
foo.lst <- subset(gTrialList,(TrialList==1 & Subject==sublst))
Difficult because no reproducible code with data is offered. Have you
considered substituting %in% for the "==" operator in subset?
Error: longer object length is not a multiple of shorter object
length
Subject would be unlikely to be "==" to that vector.
foo.lst <- subset(gTrialList,(TrialList==1))
foo.lst[foo.lst$Subject==sublst]
Again, perhaps %in% might do the trick (if you also added a missing
comma.)
> s <- data.frame(cnt=1:10, LT=sample(LETTERS, 10) )
> s
cnt LT
1 1 U
2 2 G
3 3 F
4 4 P
5 5 H
6 6 M
7 7 Q
8 8 N
9 9 T
10 10 B
>
> s[s$LT %in% c("F","N"), ]
cnt LT
3 3 F
8 8 N
Error:
In foo.lst$Subject == sublst :
longer object length is not a multiple of shorter object length
The only way I know is to use a for-loop to exhaust the index and then
combine the cases back together. But will there be a simpler way to do
so?
Thank you very much for the help!
- John
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David Winsemius, MD
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West Hartford, CT
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
