[R] Pasting function arguments and strings
Dear R community,
I am struggling a bit with a probably fairly simple task. I need to use some
already existing functions as argument for a new function that I am going to
create. 'dataset' is an argument, and it comprises objects named
'mean_test', 'sd_test', 'kurt_test' and so on. 'arg1' tells what object I
want (mean, sd, kurt) while 'arg2' tells what to do to the object taken in
'arg1' (again could be mean, sd, but also any other operation/function).
I was thinking about something like:
myfunction-function(dataset,arg1,arg2)
{
attach(dataset)
result=arg2(paste(arg1,_test))
return(result)
}
But this of course does not work! 'arg1' is of type closure and I cannot set
it as character. Moreover, paste will create a string, and I do not think I
can pass a string to the function of 'arg2'. How should I do?
Thanks,
Marco
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Re: [R] Pasting function arguments and strings
If I understand you correctly, just arg2(arg1) will work fine...One of
the nice features of R.
Example:
f - function(dat,fun=mean,...)
{
fun(dat, ...) ## ... allows extra arguments to fun
}
f( rnorm(10), trim=.05) ## trimmed mean
x - 1:10
f(x, fun = max,na.rm=TRUE)
Cheers,
Bert
On Wed, Oct 13, 2010 at 8:57 AM, Manta mantin...@libero.it wrote:
Dear R community,
I am struggling a bit with a probably fairly simple task. I need to use some
already existing functions as argument for a new function that I am going to
create. 'dataset' is an argument, and it comprises objects named
'mean_test', 'sd_test', 'kurt_test' and so on. 'arg1' tells what object I
want (mean, sd, kurt) while 'arg2' tells what to do to the object taken in
'arg1' (again could be mean, sd, but also any other operation/function).
I was thinking about something like:
myfunction-function(dataset,arg1,arg2)
{
attach(dataset)
result=arg2(paste(arg1,_test))
return(result)
}
But this of course does not work! 'arg1' is of type closure and I cannot set
it as character. Moreover, paste will create a string, and I do not think I
can pass a string to the function of 'arg2'. How should I do?
Thanks,
Marco
--
View this message in context:
http://r.789695.n4.nabble.com/Pasting-function-arguments-and-strings-tp2993905p2993905.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Bert Gunter
Genentech Nonclinical Biostatistics
__
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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.
Re: [R] Pasting function arguments and strings
Thaks for your quick reply Bert, although I doubt it works. The reason is that the names of the objects of the dataset, all end with the sufix '_test' and therefore I need to attach/paste/glue this suffix to the 'arg2' of the function. Any other idea? -- View this message in context: http://r.789695.n4.nabble.com/Pasting-function-arguments-and-strings-tp2993905p2993976.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Pasting function arguments and strings
From what I read, you want something like this:
myfunction-function(dataset,arg1,arg2)
{
func = match.fun(arg2)
argument = dataset[, match(paste(arg1,_test, sep=), names(dataset))]
result=func(argument)
return(result)
}
On Wed, Oct 13, 2010 at 9:28 AM, Manta mantin...@libero.it wrote:
Thaks for your quick reply Bert, although I doubt it works.
The reason is that the names of the objects of the dataset, all end with the
sufix '_test' and therefore I need to attach/paste/glue this suffix to the
'arg2' of the function. Any other idea?
--
View this message in context:
http://r.789695.n4.nabble.com/Pasting-function-arguments-and-strings-tp2993905p2993976.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Pasting function arguments and strings
Is this the sort of thing you are looking for?
f - function(testName, dataset, ...) {
+ testFunc - match.fun(paste(testName, _test, sep=))
+ testFunc(dataset, ...)
+ }
m_test - function(x) the m test
p_test - function(x) the p test
f(m, 17)
[1] the m test
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
-Original Message-
From: r-help-boun...@r-project.org
[mailto:r-help-boun...@r-project.org] On Behalf Of Manta
Sent: Wednesday, October 13, 2010 9:29 AM
To: r-help@r-project.org
Subject: Re: [R] Pasting function arguments and strings
Thaks for your quick reply Bert, although I doubt it works.
The reason is that the names of the objects of the dataset,
all end with the
sufix '_test' and therefore I need to attach/paste/glue this
suffix to the
'arg2' of the function. Any other idea?
--
View this message in context:
http://r.789695.n4.nabble.com/Pasting-function-arguments-and-s
trings-tp2993905p2993976.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
