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=FALSE)
> plot(ccfresult, type='l')
Duncan Murdoch
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