Hi all, I have a problem with this code... as it generates an error in R. z<-predict(dat.fit, newdata=grd) I saw a post on R forum about this ["chfactor.c", line 130: singular matrix in function LDLfactor() ] error and tried pretty much anything I could read about it and still haven had any luck with it. I have tried with the zerodist() and there are no duplicate point within the dataset.. Thanks, m [[alternative HTML version deleted]]