HI

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

Regards,
Richie.

Mathematical Sciences Unit
HSL


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