On Aug 23, 2009, at 9:56 PM, Steven Kang wrote:
Dear R users,
I am using "subset" function to filter out specific conditions and
would
like to use the value of subsetted argument as a name of an object.
Specifically, from the following statement:
a <- subset(dat, dat$x == "A" & dat$xx == 1 & dat$xxx == "AB" &
dat$y
== "B" & dat$yy == 2)
I would to assign the value of the 3rd subset argument (i.e. "AB")
as an
object's name such as:
a.AB <- sum(a$z)
Sounds like you need to read FAQ 7.21:
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-turn-a-string-into-a-variable_003f
Perhaps, ... lightly tested, of course, because no reproducible data
provided:
assign( paste("a.", sum(a$z), sep=""),
subset(dat,x == "A" & xx == 1 & xxx == "AB" & y== "B" & yy
== 2) )
# you do not need the "dat$"'s in the subset.
> a <- data.frame(x=1:4, y=4:7, xx=8:11, xxx=12:15)
> a
x y xx xxx
1 1 4 8 12
2 2 5 9 13
3 3 6 10 14
4 4 7 11 15
> a.10
x y xx xxx
1 1 4 8 12
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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