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cisna
2006 Oct 16
6
NULL or NA for missing function arguments?
Hi,
I am troubled by the use of NULL or NA to indicate
missing/non-specified function arguments.
In the R code that I have looked at, it seems that both forms are used
(NULL seems to be used more often though). Sometimes both variants are
in the same declaration, e.g.
format.default <-
function(x, trim = FALSE, digits = NULL, nsmall = 0,
justify = c("left",