R help - Apr 2011 - how to extract options for a function call

Hi, I'm having some difficulties formulating this question.

But what I want,
is to extract the options associated with a parameter for a function.

e.g.
method = c("Nelder-Mead", "BFGS", "CG",
"L-BFGS-B", "SANN")
in the optim function.

So I would like to have a vector with
c("Nelder-Mead", "BFGS", "CG",
"L-BFGS-B", "SANN")


Or for instance the 'method' in the dist function can be supplied with
euclidian,maximum,manhatten, canberra,binary,minkowski.

Is there someway to extract this so I would have a vector with
c("euclidian","maximum","manhatten",
"canberra","binary","minkowski").


Thanks

Try this:

For optim:
eval(formals(optim)$method)

For dist function:
 eval(body(dist)[[3]][[3]])

On Mon, Apr 18, 2011 at 10:56 AM, fisken <torpedofisken at gmail.com>
wrote:
> Hi, I'm having some difficulties formulating this question.
>
> But what I want,
> is to extract the options associated with a parameter for a function.
>
> e.g.
> method = c("Nelder-Mead", "BFGS", "CG",
"L-BFGS-B", "SANN")
> in the optim function.
>
> So I would like to have a vector with
> c("Nelder-Mead", "BFGS", "CG",
"L-BFGS-B", "SANN")
>
>
> Or for instance the 'method' in the dist function can be supplied
with
> euclidian,maximum,manhatten, canberra,binary,minkowski.
>
> Is there someway to extract this so I would have a vector with
> c("euclidian","maximum","manhatten",
"canberra","binary","minkowski").
>
>
> Thanks
>
> ______________________________________________
> R-help at 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.
>


-- 
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O

>>> fisken <torpedofisken at gmail.com> 18/04/2011 14:56:56
>>>
>But what I want,
>is to extract the options associated with a parameter for a function.
Try 
?formals

S Ellison

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This email and any attachments are confidential. Any use...{{dropped:8}}

thanks

2011/4/18 S Ellison <S.Ellison at lgc.co.uk>:
>
>
>>>> fisken <torpedofisken at gmail.com> 18/04/2011 14:56:56
>>>
>>But what I want,
>>is to extract the options associated with a parameter for a function.
>
> Try
> ?formals
>
> S Ellison
>
> *******************************************************************
> This email and any attachments are confidential. Any u...{{dropped:9}}