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mm4
1998 Mar 26
0
S programming style & "missing(.)" [was "regarding bugs in barplot" on R-core]
...ve "S Programming Style" hints,
John Maindonald added to them, giving the is.null(.) hint,
and Rich Heiberger and me ``concluded'']
Here an excerpt of these December 1994 mailings:
RMH:
My conclusion is that an explicit NULL default value is safer than
a missing default.
MM:
MM94> I completely agree ---
MM94> it has the further advantage (hidden in RMH's example)
MM94> that you can explicitly set the parameter to NULL
MM94> which allows for the following nice code in a calling function :
MM94>
MM94> myfunction <- function(.........) {
MM94>...