As a general matter, empty arguments are allowed and are used meaningfully in
some contexts, notably A[i,], which is syntactic sugarcoating of "["(A,i,).
I.e., these are different:
> "["(Sigma,2,) # 2nd row
[1] 0.077 0.168
> "["(Sigma,2) # 2nd element
[1] 0.077
It is somewhat rare to have an
> By putting in the comma, unless I am mistaken, you are effectively
> saying the second element is NULL, which is how it's naturally
> defined.
No, in f(x,) the second argument is missing, not NULL.
-Bill
On Fri, Sep 16, 2022 at 7:43 AM Avraham Adler
wrote:
> That may actually be the case
That may actually be the case for EVERY default plot, if I understand
correctly. The default S# plot is defined as
## Default S3 method:
plot(x, y = NULL, type = "p", xlim = NULL, ylim = NULL,
log = "", main = NULL, sub = NULL, xlab = NULL, ylab = NULL,
ann = par("ann"), axes = TRUE,
> Gabriel Becker writes:
Friends,
I always keep forgetting how these things currently/precisely work, but
I guess the principle is that utils:::.onLoad() does
options(repos = c(CRAN = "@CRAN@"))
unless the repos option was already set (in the user or site profiles).
As the latter are not
