[R] HI

Richard.Cotton at hsl.gov.uk Richard.Cotton at hsl.gov.uk
Tue Sep 16 16:20:16 CEST 2008

> > Does anyone know an easy way to convert all the zero values in a 
> imported csv table into NA's
> Depends on the data structure you gave your imported table. In a 
> single numeric vector (named, say, vec), the syntax is
> is.na(vec[vec==0]) <- TRUE

That throws errors for me.  An alternative is 
vec[vec==0] <- NA

This also works for data frames, e.g.
df <- data.frame(a=c(1,2,3,0,3,4,0,5,2), b=c(1,0,0,1,1,0,1,1,0))
df[df==0] <- NA


Mathematical Sciences Unit


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