I use:
foo - function(...) {
args - list(...);
names(args);
}
/Henrik
On 6/1/07, Mike Meredith [EMAIL PROTECTED] wrote:
Is there a tidy way to get the names of objects passed to a function via the
... argument?
rbind/cbind does what I want:
test.func1 - function(...) {
nms -
Thanks, Henrik, but 'foo' doesn't do what I want:
x - some stuff
second - more stuff
foo(first=x, second)
[1] first
Brian's right:
...he wants the argument name if there is one otherwise the
deparsed argument value, but clarification would be helpful.
The function using this compares
On Fri, 1 Jun 2007, Henrik Bengtsson wrote:
I use:
foo - function(...) {
args - list(...);
names(args);
}
But that does not do what was asked: it gets the argument names, not the
object names. (Did you actually try it?) It looks from the example that
he wants the argument name if
See:
http://tolstoy.newcastle.edu.au/R/e2/help/06/10/2242.html
which we can modify slightly for the case in question like this:
f - function(...) {
x - list(...)
if (is.null(names(x))) names(x) -
names(x)[names(x) == ] - NA
mc - match.call()[-1]
How about
foo - function(...)
{
m - as.list(match.call(expand.dots=TRUE))[-1]
nm - names(m)
for(i in seq_along(m)) if(!nchar(nm[i])) nm[i] - deparse(m[[i]])
nm
}
Such things are hard to do from R level, hence the use of match.call to do
it at C level.
On Fri, 1 Jun 2007, Mike
Thanks very much to all of you. It looks like 'match.call' is the key, and
both Brian's and Gabor's solutions work fine. --- Mike.
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On 6/1/07, Mike Meredith [EMAIL PROTECTED] wrote:
Thanks very much to all of you. It looks like 'match.call' is the key, and
both Brian's and Gabor's solutions work fine. --- Mike.
Brian's is shorter but I think the one in my post is a bit more robust:
f1 - function(...) {
+m -
Sorry, I responded a bit too hastily last night, without testing the two
functions properly.
Brian's is shorter but I think the one in my post is a bit more robust:
Indeed! 'f1' only works if at least one of the arguments is named. Otherwise
'nm' is NULL and 'nchar(nm[i])' fails. 'f2' seems to
Is there a tidy way to get the names of objects passed to a function via the
... argument?
rbind/cbind does what I want:
test.func1 - function(...) {
nms - rownames(rbind(..., deparse.level=1))
print(nms)
}
x - some stuff
second - more stuff
test.func1(first=x, second)
[1] first second
