have a look at ?"[.data.frame"; what you need is the following:
dat <- data.frame(a = rbinom(20, 1, 0.5), x = rnorm(20), y = rnorm(20))
dat
dat[dat$a == 1, ]
I hope it helps.
Best,
Dimitris
Bunny, lautloscrew.com wrote:
Hi all,
i have a pretty easy indexing question, at least i believe so. The main
reason i post it here, is that brackets and $ are hard to google.
How do I index correctly, if i just want to display the whole dataset
conditioned on the fact that some particular column equals one.
I know i can do something like: data$somecolumn[data$particularcol
==1] . That will show all "some column" values where the particular
column is 1.
Unfortunately something like : data[data$particularcol ==1] does not
work to get the whole matrix.
is there some easy way except the % in % stuff ?
Thx in advance
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--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
______________________________________________
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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.
