Below is one way to do this: > v1<-c(2,2,4,NA,NA,NA,10,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA) > v2<-c(NA,4,NA,NA,NA,NA,10,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,100,NA) > length(v1) [1] 20 > length(v2) [1] 20 > intersect(which(!is.na(v1)),which(!is.na(v2))) [1] 2 7 >
--- dxc13 <[EMAIL PROTECTED]> wrote: > > useR's > > I am trying to compare two vectors that have the > same length. More > specifically, I am interested in comparing the > corresponding positions of > each element in the vector. > > Consider these two vectors of length 20: > > v1 <- 2 2 4 NA NA NA 10 NA NA NA NA > NA NA NA NA NA NA > NA NA NA > v2 <- NA 4 NA NA NA NA 10 NA NA NA NA > NA NA NA NA NA NA > NA 100 NA > > I am only interested in extracting the position > number where both vectors > are not equal to NA at the same position. > For example, the second element of both vectors is > not equal to NA, and thus > I want to return '2'; similary, I also would want to > have '7' returned > because the seventh element of both arrays is not > equal to NA. > > In general, I would like to find a way to do this > for any number of given > positions between the two vectors that satisfy this. > If no positions > satisfy this, then return '0' > > I would like to store the results as an object. > > If anyone has any ideas, I would greatly appreciate > it. Thanks! > > dxc13 > -- > View this message in context: > http://www.nabble.com/how-to-compare-2-numeric-vectors-tf4469582.html#a12743842 > Sent from the R help mailing list archive at > Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, > reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
