Identifying and removing "NA"s and other errors [duplicate]

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开发者_StackOverflow 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

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Assuming that your data is in dat (could be a vector, matrix, or data frame):

dat[is.na(dat)]<-0

replaces all NA entries of dat with 0.