On Sat, 11 Oct 2008, Alexy Khrabrov wrote:
Is there a way to select a subset of a dataframe consisting of all those rows
with rownames *except* from a subset of rownames to be excluded? Example:
Yes: DF[is.na(match(row.names(DF), exclude_me)), ]
a <- data.frame(x=1:10,y=10:1)
a <- a[order(a$y),] # to make rownames differ visually
a[8,]
x y
3 3 8
a["8",]
x y
8 8 3
a[-8,]
x y
10 10 1
9 9 2
8 8 3
7 7 4
6 6 5
5 5 6
4 4 7
2 2 9
1 1 10
a[-"8",]
Error in -"8" : invalid argument to unary operator
-- is there a similar exclusion operator or simple way? So far the best I
can do is
a[setdiff(rownames(a),"8"),]
x y
10 10 1
9 9 2
7 7 4
6 6 5
5 5 6
4 4 7
3 3 8
2 2 9
1 1 10
Cheers,
Alexy
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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