Hello again, thank you again for all of your help. I am trying to get
the arguments for a function, in a way that I can handle them. If I do
args(fun), it doesnt really do what I want. If I use formals(fun) i get
output like:
$a
$r
$s
Now, lthis is supposedly a list, but if i say formals(a)[[1]], I get
nothing. I am just trying to get a vector with teh arguments of a
function so I can loop over them.
ex; a<-function(p,r){p+r}
want: vector of c("p", "r")
The documentation for args and formals is quite confusing. Thanks again!
~Erithid
names(formals(fun)) You need the names of the elements of the list formals produces, not their content! Ales Ziberna ----- Original Message ----- From: "BJ" <erithid at bellsouth.net> To: <r-help at stat.math.ethz.ch> Sent: Monday, May 23, 2005 4:45 PM Subject: [R] formals or args question> Hello again, thank you again for all of your help. I am trying to get the > arguments for a function, in a way that I can handle them. If I do > args(fun), it doesnt really do what I want. If I use formals(fun) i get > output like: > > $a > > > $r > > > $s > > > Now, lthis is supposedly a list, but if i say formals(a)[[1]], I get > nothing. I am just trying to get a vector with teh arguments of a > function so I can loop over them. > > ex; a<-function(p,r){p+r} > > want: vector of c("p", "r") > > The documentation for args and formals is quite confusing. Thanks again! > ~Erithid > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > >
formals() returns a list, so you could try this:
a <- function(p, r) p + r
names(formals(a))
I hope it helps.
Best,
Dimitris
----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/16/336899
Fax: +32/16/337015
Web: http://www.med.kuleuven.ac.be/biostat/
http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm
----- Original Message -----
From: "BJ" <erithid at bellsouth.net>
To: <r-help at stat.math.ethz.ch>
Sent: Monday, May 23, 2005 4:45 PM
Subject: [R] formals or args question
> Hello again, thank you again for all of your help. I am trying to
> get the arguments for a function, in a way that I can handle them.
> If I do args(fun), it doesnt really do what I want. If I use
> formals(fun) i get output like:
>
> $a
>
>
> $r
>
>
> $s
>
>
> Now, lthis is supposedly a list, but if i say formals(a)[[1]], I get
> nothing. I am just trying to get a vector with teh arguments of a
> function so I can loop over them.
>
> ex; a<-function(p,r){p+r}
>
> want: vector of c("p", "r")
>
> The documentation for args and formals is quite confusing. Thanks
> again! ~Erithid
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
>
Ahh. Thanks a lot! works great. :-p Ales Ziberna wrote:> names(formals(fun)) > > You need the names of the elements of the list formals produces, not > their content! > > Ales Ziberna > > ----- Original Message ----- From: "BJ" <erithid at bellsouth.net> > To: <r-help at stat.math.ethz.ch> > Sent: Monday, May 23, 2005 4:45 PM > Subject: [R] formals or args question > > >> Hello again, thank you again for all of your help. I am trying to get >> the >> arguments for a function, in a way that I can handle them. If I do >> args(fun), it doesnt really do what I want. If I use formals(fun) i get >> output like: >> >> $a >> >> >> $r >> >> >> $s >> >> >> Now, lthis is supposedly a list, but if i say formals(a)[[1]], I get >> nothing. I am just trying to get a vector with teh arguments of a >> function so I can loop over them. >> >> ex; a<-function(p,r){p+r} >> >> want: vector of c("p", "r") >> >> The documentation for args and formals is quite confusing. Thanks again! >> ~Erithid >> >> ______________________________________________ >> R-help at stat.math.ethz.ch mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide! >> http://www.R-project.org/posting-guide.html >> >> > >