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Possible Duplicate:
Test for NA and select values based on result
Suppose you have a vector — you do a calculation on the vector — many of the elements return “NA” — how do you identify these “NA”s and change them to some usable integer
Assuming that your data is in
dat(could be a vector, matrix, or data frame):dat[is.na(dat)]<-0replaces all
NAentries ofdatwith0.