On Fri, Oct 17, 2008 at 3:50 PM, <[EMAIL PROTECTED]> wrote: > > Thanks for the gracious assistance in advance > > I'm working on a non-metric scaling problem and am calculating the distance > for input to isoMDS > > Here is the code > > library(MASS) > vegdata <- tapply(Percent, list(PRIMARY_VE, MASTERID), sum) > x.mat <- matrix(x, nrow=40, ncol=2750, byrow=TRUE, dimnames = > c(dimnames(x)[1], dimnames(x)[2])) > > > vegdata.dd <- dist(x) > vegdata.dd <- ifelse(vegdata.dd==NA, 0.01, x.dd) > vegdata.dd > > Everything works as expected until I try to replace the NA values in the > distance matrix. > the ifelse statement converts the entire dataset to NA. > > What am I doing incorrectly?
What does NA == NA equal? This is not intuitive (at first!) but very important when dealing with NAs. Hadley -- http://had.co.nz/ ______________________________________________ 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.
