[R] How to pass function argument of same name to internal call?
murdoch at stats.uwo.ca
Sat Jul 26 00:46:30 CEST 2008
On 25/07/2008 4:28 PM, Carl Witthoft wrote:
> I ran across this problem when playing with ccf().
> Its function call is
> >function (x, y, lag.max = NULL, type = c("correlation", "covariance"),
> plot = TRUE, na.action = na.fail, ...)
> Internally, ccf() calls plot(), which digs up plot.acf() whose default
> style is type='h' .
> I wanted to pass the argument type='l' to the plotting routine, but of
> course I can't put two arguments named "type" into the ccf() call.
> I made do with the work-around of writing "myccf," with the argument for
> the acf() call changed to "cortype," but that's ugly.
> Is there a way to "escape" an argument so it gets ignored by the main
> function and only gets read by the internally-called function?
No. You should choose "plot=FALSE", save the result, then call plot()
with your new arg for type.
For example, following the ?ccf example,
> ccfresult <- ccf(mdeaths, fdeaths, ylab = "cross-correlation",
> plot(ccfresult, type='l')
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