[R] how to manipulate ... in the argument list

[Vito M. R. Muggeo]

Hi Witold,
use do.call()

list.args<-list(...)

#modify 'list.args' (add/delete/modify)

do.call(image, list.args)

best,
vito


Il 11/05/2016 10.45, Witold E Wolski ha scritto:
> Hi,
>
> I am looking for a documentation describing how to manipulate the
> "..." . Searching R-intro.html gives to many not relevant hits for
> "..."
>
> What I want to do is something like this :
>
>
> image.2 <- function(x, col , ...){
>   # function is manipulating colors (adding a few)
>   # since it changes colors it needs to update breaks if defined.
>
>    breaks <- list(...)$breaks
>
>   if( !is.null( list(...)$breaks ) ){
>      #manipulate breaks
>
>     image(x, col, breaks = breaks ,...)
>
>    }else{
>       image(x,col ,...)
>    }
> }
>
> but in order to get it working I will need to remove breaks from ...
> since otherwise I am getting multiple defined argument for breaks.
>
> So how to manipulate the "..." argument? Or should I use a different pattern
>
> best
>
>
>

-- 
==============================================
Vito M.R. Muggeo
Dip.to Sc Statist e Matem `Vianelli'
Università di Palermo
viale delle Scienze, edificio 13
90128 Palermo - ITALY
tel: 091 23895240
fax: 091 485726
http://dssm.unipa.it/vmuggeo
Associate Editor, Statistical Modelling