[R] How do I query ... in a function call?
This is probably a very noobish question, but if I want to create a
function that allows an undetermined number of, say, numeric vectors to be
fed to it, I would use:
myfunction = function(...)
{
# Do something
}
Right? If so, how do I a) count the number of vectors fed to the
function, and b) how do I treat those vectors as variables, e.g. for the
call:
myfunction(c(1:10),c(2:11),c(3:13))
Thanks!
--j
--
Jonathan A. Greenberg, PhD
Assistant Professor
Department of Geography
University of Illinois at Urbana-Champaign
607 South Mathews Avenue, MC 150
Urbana, IL 61801
Phone: 415-763-5476
AIM: jgrn307, MSN: jgrn...@hotmail.com, Gchat: jgrn307, Skype: jgrn3007
http://www.geog.illinois.edu/people/JonathanGreenberg.html
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Re: [R] How do I query ... in a function call?
You can do something like this:
test - function(x,...){
print(x)
args = list(...)
if('y' %in% names(args))print(args$y)
if('z' %in% names(args))print(args$z)
}
Regards
Søren
Fra: r-help-boun...@r-project.org [r-help-boun...@r-project.org] P#229; vegne
af Jonathan Greenberg [j...@illinois.edu]
Sendt: 21. november 2011 23:18
Til: r-help
Emne: [R] How do I query ... in a function call?
This is probably a very noobish question, but if I want to create a
function that allows an undetermined number of, say, numeric vectors to be
fed to it, I would use:
myfunction = function(...)
{
# Do something
}
Right? If so, how do I a) count the number of vectors fed to the
function, and b) how do I treat those vectors as variables, e.g. for the
call:
myfunction(c(1:10),c(2:11),c(3:13))
Thanks!
--j
--
Jonathan A. Greenberg, PhD
Assistant Professor
Department of Geography
University of Illinois at Urbana-Champaign
607 South Mathews Avenue, MC 150
Urbana, IL 61801
Phone: 415-763-5476
AIM: jgrn307, MSN: jgrn...@hotmail.com, Gchat: jgrn307, Skype: jgrn3007
http://www.geog.illinois.edu/people/JonathanGreenberg.html
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and provide commented, minimal, self-contained, reproducible code.
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Re: [R] How do I query ... in a function call?
Hi Jonathan,
On Mon, Nov 21, 2011 at 5:18 PM, Jonathan Greenberg j...@illinois.edu wrote:
This is probably a very noobish question, but if I want to create a
function that allows an undetermined number of, say, numeric vectors to be
fed to it, I would use:
myfunction = function(...)
{
# Do something
}
Right? If so, how do I a) count the number of vectors fed to the
function, and b) how do I treat those vectors as variables, e.g. for the
call:
myfunction(c(1:10),c(2:11),c(3:13))
`args - list(...)` will create a list out of the things passed
through in `...`
For example:
myfunction - function(...) {
args - list(...)
length(args) ## this is how many things were passed in
names(args) ## these are the variable names used
## etc.
}
HTH,
-steve
--
Steve Lianoglou
Graduate Student: Computational Systems Biology
| Memorial Sloan-Kettering Cancer Center
| Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos/contact
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Re: [R] How do I query ... in a function call?
Hi: You can make a list out of the ... by doing below.
myfunction = function(...)
{
params - list(...)
print(params)
print(str(params))
}
On Mon, Nov 21, 2011 at 5:18 PM, Jonathan Greenberg j...@illinois.eduwrote:
This is probably a very noobish question, but if I want to create a
function that allows an undetermined number of, say, numeric vectors to be
fed to it, I would use:
myfunction = function(...)
{
# Do something
}
Right? If so, how do I a) count the number of vectors fed to the
function, and b) how do I treat those vectors as variables, e.g. for the
call:
myfunction(c(1:10),c(2:11),c(3:13))
Thanks!
--j
--
Jonathan A. Greenberg, PhD
Assistant Professor
Department of Geography
University of Illinois at Urbana-Champaign
607 South Mathews Avenue, MC 150
Urbana, IL 61801
Phone: 415-763-5476
AIM: jgrn307, MSN: jgrn...@hotmail.com, Gchat: jgrn307, Skype: jgrn3007
http://www.geog.illinois.edu/people/JonathanGreenberg.html
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http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
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and provide commented, minimal, self-contained, reproducible code.
