[R] Convert NA to '.'

[David_D]

Dear R-users,

For reporting purpose (using Sweave and LaTeX), I am creating complex tables
with the cat function such as

> x<-c("A", "B", "C", NA)
> cat(x, '\n')
A B C NA

For convenience, I would like to change all my NA value to something else
like '.' (as in SAS for example). Is there a global option which allows this
change? Or should I change all my code to work with the print function and
the na.print argument?

Best regards,
David
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