Extracting the name of a function (inverse of match.fun("myFun"))
On 12-08-29 04:00 PM, Peter Langfelder wrote:
On Wed, Aug 29, 2012 at 3:36 PM, Peter Langfelder <peter.langfelder at gmail.com> wrote:
Hi all,
is there a way to extract the name of a function, i.e. do the reverse
of match.fun applied to a character string? I would like to print out
the name of a function supplied to another function as an argument.
For example:
myFunc = function(x) { x+1 }
applyFunc = function(fnc, x)
{
fnc = match.fun(fnc)
fnc(x)
}
Is there a way to obtain "myFunc" from the argument fnc in applyFnc
the following call is issued?
applyFnc(myFunc, 1)
...or am I missing the basic fact that since arguments to functions in R are passed by copy, the name is lost/meaningless?
You can pass the function name as a string.
applyFunc = function(fun, x)
{
fnc = match.fun(fun)
fnc(x)
print(fun)
}
applyFunc("myFunc", 1)
[1] "myFunc"
PS : avoid renaming the name of your argument within the function ("fnc
= match.fun(fnc)").
Cheers,
Eloi
Thanks, Peter
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Eloi Mercier Bioinformatics PhD Student, UBC Paul Pavlidis Lab 2185 East Mall University of British Columbia Vancouver BC V6T1Z4