--- John Fox <[EMAIL PROTECTED]> wrote: > Dear John, > > The behaviour of R is reasonable, since, in your > example, 4 + NA should in > general be NA (i.e., missing). You can do what you > want by changing NAs to > 0s: > > > a[is.na(a)] <- 0 > > a + b > [1] 5 4 8 > > I hope this helps, > John
Thanks John. Just what I needed. I realised that R was being reasonable, I just did not how to easily get around it. I was using sum(x na.rm=T) and I guess I was looking for something similar. > > -------------------------------- > John Fox > Department of Sociology > McMaster University > Hamilton, Ontario > Canada L8S 4M4 > 905-525-9140x23604 > http://socserv.mcmaster.ca/jfox > -------------------------------- > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On > Behalf Of John Kane > > Sent: Monday, May 01, 2006 12:26 PM > > To: R R-help > > Subject: [R] Adding elements in an array where I > have missing data. > > > > 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