On Jul 1, 2010, at 1:24 PM, Allan Engelhardt wrote:
I can, after carefully reading about the returned values, see why
library("MASS", "MASS", character.only=TRUE)
has to chose between loading the package and displaying the help (I
thought I had found a nice shortcut), but wouldn't the documentation
be better if it said that the two are incompatible and that package=
takes precedence over help=?
As an aside, is there a way to explicitly specify a missing argument
in a function call? For an example using the same function as before,
library(, "MASS", character.only=TRUE)
I have always used:
help(package=MASS) # does not need to be quoted
My annoyance/whine is that various functions use "pkg", pkgs", or
"package" as argument names. This is the only one I have successfully
committed to memory.
displays the help but can be a little hard on the programmer's
eyes. However,
library(NULL, "MASS", character.only=TRUE)
library(NA, "MASS", character.only=TRUE)
library({}, "MASS", character.only=TRUE) # signals error.
doesn't do the same at all (I thought the first one would, based on
the "whenever" in the documentation: "It is used whenever there is a
need to indicate or specify that an object is absent.").
Is there in the language a lexical x such that f(x, ...) is the same
as f(, ...)?
(Yes, I know about named arguments and I like them, I am just trying
to learn syntax here.)
Allan
--
David Winsemius, MD
West Hartford, CT
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