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", "right", "centre", "none"),
width = NULL, na.encode = TRUE, scientific = NA,
big.mark = "", big.interval = 3,
small.mark = "", small.interval = 5, decimal.mark = ".",
zero.print = NULL, ...)
Is there a right way? And if both forms are used, how do I know which
one is right?
Thanks a lot and best regards,
Hans-Peter
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