On Jul 15, 2014, at 5:04 PM, William Dunlap wrote:
Does it make sense to call match.call outside of a function without
specifying both the function definition and the call to the function?
My puzzlement came from the different response to these two commands:
match.call(g)
match.call(definition=g)
I thought they would be the same. So you are saying to make sense this
would need to be
> match.call(definition=g , call=quote(g(1)) )
g(x = 1)
--
David.
I agree that the error message is misleading. Also, the return value
when call is not supplied does not seem useful, although it is
possible that it is correct in some technical sense.
match.call(definition=function(FirstArg, SecondArg)NULL,
quote(anyFuncName(S=2, 1)))
anyFuncName(FirstArg = 1, SecondArg = 2)
match.call(function(FirstArg, SecondArg)NULL,
quote(anyFuncName(S=2, 1)))
anyFuncName(FirstArg = 1, SecondArg = 2)
# without supplying 'call':
match.call(definition=function(FirstArg, SecondArg)NULL)
Error in match.call(definition, call, expand.dots) :
unused argument (definition = function(FirstArg, SecondArg) NULL)
match.call(function(FirstArg, SecondArg)NULL)
match.call(FirstArg = function(FirstArg, SecondArg) NULL)
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On Tue, Jul 15, 2014 at 4:27 PM, David Winsemius <dwinsem...@comcast.net
> wrote:
The help page says:
"Calling match.call outside a function without specifying
definition is an
error."
And yet when I send a function with a 'definition' argument it
errors:
g
function(x, y=NULL, z=NULL) invisible(NULL)
match.call(definition=g)
Error in match.call(definition, call, expand.dots) :
unused argument(s) (definition = g)
I wondered if this had something to do with primitive functions and
their
ignoring names but:
is.primitive(match.call)
[1] FALSE
Calling with an unnamed first argument succeeds:
match.call(g )
match.call(x = g)
--
David Winsemius, MD
Alameda, CA, USA
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David Winsemius, MD
Alameda, CA, USA
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
