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Liaw, Andy

2003-Mar-21 20:36 UTC

[R] manipulating "..." inside a function

Dear R-help,

Can some one tell me how to do the following (if it's possible)?

Suppose I have a function like this:

f <- function(x, y, ...) {
    ## some code
    g(x, y, ...)
   ## some more code
}

The problem is that g() may not understand everything that comes through in
"...".  Is there a way to delete some component of "..." and
then pass it to
g()?

Here's the description of the real problem:  f() is a panel.something
function, and g() is a model fitting function.  Lattice passes
"panel.number" as part of "..." to f(), and g() complains
about unused
argument "panel.number".

I'd be very grateful for any help!

Cheers,
Andy


------------------------------------------------------------------------------

Wiener, Matthew

2003-Mar-21 20:48 UTC

head link

[R] manipulating "..." inside a function

As Brian Ripley pointed out in a recent post, you can just give g() its own
"..." argument.

Regards, 

Matt Wiener

-----Original Message-----
From: Liaw, Andy [mailto:andy_liaw at merck.com] 
Sent: Friday, March 21, 2003 3:37 PM
To: 'r-help at stat.math.ethz.ch'
Subject: [R] manipulating "..." inside a function


Dear R-help,

Can some one tell me how to do the following (if it's possible)?

Suppose I have a function like this:

f <- function(x, y, ...) {
    ## some code
    g(x, y, ...)
   ## some more code
}

The problem is that g() may not understand everything that comes through in
"...".  Is there a way to delete some component of "..." and
then pass it to
g()?

Here's the description of the real problem:  f() is a panel.something
function, and g() is a model fitting function.  Lattice passes
"panel.number" as part of "..." to f(), and g() complains
about unused
argument "panel.number".

I'd be very grateful for any help!

Cheers,
Andy


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Ben Bolker

2003-Mar-21 20:59 UTC

head link

[R] manipulating "..." inside a function

I have a couple of slightly ugly functions to do this in my bbmisc 
package:

clean.args <- function(argstr,fn,extrabad=NULL,dots.ok=TRUE) {
  fnargs <- names(formals(fn))
  if (length(argstr)>0 && !("..." %in% fnargs &&
dots.ok))  {
    badargs <- !sapply(names(argstr),"%in%",c(fnargs,""))
    argstr <- argstr[!badargs]
  }
  for (i in extrabad)
    argstr[[i]] <- NULL
  argstr
}

remove.args <- function(argstr,fn) {
  fnargs <- names(formals(fn))
  argstr[!(names(argstr) %in% fnargs)]
}


On Fri, 21 Mar 2003, Liaw, Andy wrote:
> Dear R-help,
> 
> Can some one tell me how to do the following (if it's possible)?
> 
> Suppose I have a function like this:
> 
> f <- function(x, y, ...) {
>     ## some code
>     g(x, y, ...)
>    ## some more code
> }
> 
> The problem is that g() may not understand everything that comes through in
> "...".  Is there a way to delete some component of
"..." and then pass it to
> g()?
> 
> Here's the description of the real problem:  f() is a panel.something
> function, and g() is a model fitting function.  Lattice passes
> "panel.number" as part of "..." to f(), and g()
complains about unused
> argument "panel.number".
> 
> I'd be very grateful for any help!
> 
> Cheers,
> Andy
> 
> 
>
------------------------------------------------------------------------------
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> 
-- 
318 Carr Hall                                bolker at zoo.ufl.edu
Zoology Department, University of Florida    http://www.zoo.ufl.edu/bolker
Box 118525                                   (ph)  352-392-5697
Gainesville, FL 32611-8525                   (fax) 352-392-3704

Liaw, Andy

2003-Mar-21 21:40 UTC

head link

[R] manipulating "..." inside a function

Thanks to those who responded.  I finally got by with some pretty ugly hack
(ceorcing ... to list, delete the unwanted part, add other arguments, and
use do.call).

Cheers,
Andy
> -----Original Message-----
> From: Ben Bolker [mailto:ben at zoo.ufl.edu]
> Sent: Friday, March 21, 2003 3:59 PM
> To: Liaw, Andy
> Cc: 'r-help at stat.math.ethz.ch'
> Subject: Re: [R] manipulating "..." inside a function
> 
> 
> 
>   I have a couple of slightly ugly functions to do this in my bbmisc 
> package:
> 
> clean.args <- function(argstr,fn,extrabad=NULL,dots.ok=TRUE) {
>   fnargs <- names(formals(fn))
>   if (length(argstr)>0 && !("..." %in% fnargs
&& dots.ok))  {
>     badargs <-
!sapply(names(argstr),"%in%",c(fnargs,""))
>     argstr <- argstr[!badargs]
>   }
>   for (i in extrabad)
>     argstr[[i]] <- NULL
>   argstr
> }
> 
> remove.args <- function(argstr,fn) {
>   fnargs <- names(formals(fn))
>   argstr[!(names(argstr) %in% fnargs)]
> }
> 
> 
> On Fri, 21 Mar 2003, Liaw, Andy wrote:
> 
> > Dear R-help,
> > 
> > Can some one tell me how to do the following (if it's possible)?
> > 
> > Suppose I have a function like this:
> > 
> > f <- function(x, y, ...) {
> >     ## some code
> >     g(x, y, ...)
> >    ## some more code
> > }
> > 
> > The problem is that g() may not understand everything that 
> comes through in
> > "...".  Is there a way to delete some component of
"..."
> and then pass it to
> > g()?
> > 
> > Here's the description of the real problem:  f() is a 
> panel.something
> > function, and g() is a model fitting function.  Lattice passes
> > "panel.number" as part of "..." to f(), and g()
complains
> about unused
> > argument "panel.number".
> > 
> > I'd be very grateful for any help!
> > 
> > Cheers,
> > Andy
> > 
> > 
> > 
> --------------------------------------------------------------
> ----------------
> > 
> > ______________________________________________
> > R-help at stat.math.ethz.ch mailing list
> > https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> > 
> 
> -- 
> 318 Carr Hall                                bolker at zoo.ufl.edu
> Zoology Department, University of Florida    
> http://www.zoo.ufl.edu/bolker
> Box 118525                                   (ph)  352-392-5697
> Gainesville, FL 32611-8525                   (fax) 352-392-3704
> 
> 
------------------------------------------------------------------------------

Deepayan Sarkar

2003-Mar-25 18:42 UTC

head link

[R] manipulating "..." inside a function

On Friday 21 March 2003 02:36 pm, Liaw, Andy wrote:> Dear R-help,
>
> Can some one tell me how to do the following (if it's possible)?
>
> Suppose I have a function like this:
>
> f <- function(x, y, ...) {
>     ## some code
>     g(x, y, ...)
>    ## some more code
> }
Why not (in the context you describe below)

f <- function(x, y, panel.number, ...) {
    ## some code
    g(x, y, ...)
   ## some more code
}

? (This is the trick usually used for the strip function in particular.) 
> The problem is that g() may not understand everything that comes through in
> "...".  Is there a way to delete some component of
"..." and then pass it
> to g()?
>
> Here's the description of the real problem:  f() is a panel.something
> function, and g() is a model fitting function.  Lattice passes
> "panel.number" as part of "..." to f(), and g()
complains about unused
> argument "panel.number".
>
> I'd be very grateful for any help!
>
> Cheers,
> Andy
>
>
> ---------------------------------------------------------------------------
>---
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help

Liaw, Andy

2003-Mar-25 18:51 UTC

head link

[R] manipulating "..." inside a function

> From: Deepayan Sarkar [mailto:deepayan at stat.wisc.edu]
> On Friday 21 March 2003 02:36 pm, Liaw, Andy wrote:
> > Dear R-help,
> >
> > Can some one tell me how to do the following (if it's possible)?
> >
> > Suppose I have a function like this:
> >
> > f <- function(x, y, ...) {
> >     ## some code
> >     g(x, y, ...)
> >    ## some more code
> > }
> 
> Why not (in the context you describe below)
> 
> f <- function(x, y, panel.number, ...) {
>     ## some code
>     g(x, y, ...)
>    ## some more code
> }
> 
> ? (This is the trick usually used for the strip function in 
> particular.) 
Ah... Yes.  It didn't come me to put unwanted argument as part of the formal
parameters of the function to catch it.  Very nifty!  Thanks!

Andy


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