Thank you Dan and Ista!
Both of you are correct, I should have used NA rather than "NA" in my
example. So the correct code should be:
X <-as.data.frame(matrix(c(9, 6, 1, 3, 9, NA, NA,NA,NA,NA,
6, 4, 3,NA, NA, NA, 5, 4, 1, 3), ncol=2))
names(X)<-c("X1","X2")
X$X1[is.na(X$X1)] <- X$X2[is.na(X$X1)]
Where the last line replaces the missing observations of X1 by those of X2.
The "if else" statement also works.
Thank you very much, again!
Rita
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