On Aug 16, 2010, at 5:53 AM, Lily_stats wrote:
Dear all,
I have an xts object , t.xts with 4 columns: "v1" "DD1" "v2" "DD2" and
created a data frame :
t <- as.data.frame(t.xts)
"t" is not the best choice of names for an object because it is the
name of a commonly used function
Let's instead assume you used "tt". Try:
tt[which(tt$DD1 >0 & tt$DD1 < 30), "v1"]
Or:
subset(tt, subset=which(tt$DD1 >0 & tt$DD1 < 30), select="v1")
I would like to extract data and create a new data frame for when
the values
in column DD1 falls between 0 and 30 and extract the corresponding
v1 value.
How can I do this?
Thanks.
David Winsemius, MD
West Hartford, CT
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