On Mar 15, 2012, at 4:38 PM, G See wrote:
my.df <- data.frame(IDX=1:42, x=rnorm(1:42))
my.df[my.df$IDX %in% c(17, 42), ]
IDX x
17 17 -0.5110095
42 42 -1.0686427
subset(my.df, IDX %in% c(17,42) )
(I find subset to give clearer code than: df[which(df$colname <logical-
cond>) , ], plus it created its own environment. Downside is that it
is recommended only for interactive use.)
--
David.
Garrett
On Thu, Mar 15, 2012 at 3:25 PM, Ed Siefker <ebs15...@gmail.com>
wrote:
I would like to subset by dataframe by matching all rows that have
any value
from a list of values. I can get it to work if I have exactly one
value,
I'm not
sure how to do it with a list of values though.
This works and gives me exactly one line:
my.df[ which( mydf$IDX==17)), ]
I would like to do something like this:
my.df[ which( mydf$IDX==c(17, 42), ]
Obviously that won't work, but I hope the meaning is clear.
What's the right way to express this?
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______________________________________________
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David Winsemius, MD
West Hartford, CT
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