[R] ... and parameter checking

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Jens Oehlschlägel-Akiyoshi (jens.oehlschlaegel-akiyoshi@mdfactory.de)
Fri, 17 Dec 1999 15:33:02 +0100 




Hi,



when writing a wrapper function, I would like to be able to pass additional


arguments to more than one function inside, e.g.



  density.panel <- function(x, na.rm=TRUE, ...){


     usr <- par("usr")


     on.exit(par(usr))


     par(usr = c(usr[1:2], 0, 1) )


     lines( density(x, na.rm=na.rm, ...), ... )


  }



and then call it like



  density.panel(x, col="red",  kernel="rectangular")



However, doing so generates an error from density (col=), which does not


allow ... and a warnings from plot.default(), which does not know about


kernel= .



Obviously I could patch density() to have a ... parameter and ignore


warnings from plot(), but, well ...



Can someone teach me how to solve this properly?



I cannot remember to have had such problems with S+, is this a difference


between R and S+ ?



Regards



--
Dr. Jens Oehlschlägel-Akiyoshi
MD FACTORY GmbH
Bayerstrasse 21

80335 München

Tel.: 089 545 28-27
Fax.: 089 545 28-10
http://www.mdfactory.de

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