On Aug 3, 2011, at 8:09 AM, zcatav wrote:
Your suggestion works perfect as i pointed previous message. Now
have another
question about data editing. I try this code:
X[X[,"c"]==1,"b"]<-X[,"d"]
and results with error: `[<-.data.frame`(`*tmp*`, X[, "c"] == 1,
"b", value
= c(NA, :
replacement has 9 rows, data has 2
Logically i selected 2 rows with X[,"c"]==1. Than i want to replace
in that
rows its own data from "d" to "b" with X[,"b"]<-X[,"d"]. What is
wrong?
You need to apply the same logical test/selection on the rows of the
RHS as you are doing on the LHS.
Possibly:
X[ X[,"c"]==1, "b"] <- X[ X[,"c"]==1, "d"]
(No data, not tested code.)
--
David Winsemius, MD
West Hartford, CT
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