--- Gabor Grothendieck <[EMAIL PROTECTED]> wrote: > Here are a few alternatives: > > replace(a, is.na(a), 0) + b > > ifelse(is.na(a), 0, a) + b > > mapply(sum, a, b, MoreArgs = list(na.rm = TRUE)) >
Excellent, thanks Gabor. I have gotten some great answers. I had been thinking of using an ifelse but nothing as sucinct as this and the mapply was way beyond me. I didn't even know enough to look it up. > On 5/1/06, John Kane <[EMAIL PROTECTED]> wrote: > > This is a simple question but I cannot seem to > find > > the answer. > > I have two vectors but with missing data and I > want to > > add them together with > > the NA's being ignored. > > > > Clearly I need to get the NA ignored. na.action? > > > > I have done some searching and cannot get > na.action to > > help. > > This must be a common enough issue that the answer > is > > staring me in the face > > but I just don't see it. > > > > Simple example > > a <- c(2, NA, 3) > > b <- c(3,4, 5) > > > > What I want is > > c <- a + b where > > c is ( 5 , 4 ,8) > > > > However I get > > c is (5,NA, 8) > > > > What am I missing? Or do I somehow need to recode > the > > NA's as missing? > > > > Thanks > > > > ______________________________________________ > > R-help@stat.math.ethz.ch mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html