plot math Q: How to "plot" hat(f') ?

Martin Maechler <maechler at stat.math.ethz.ch> writes:

In nonparametric regression and density estimation, something like
 \hat{f'}(x)  [LaTeX]  is very natural.
In all S dialects,
   hat(f')
is invalid syntax, and hence one cannot use something like
   plot(1, main = expression(hat(f')))

I can say something like

   plot(1, main = expression(widehat(paste(f, "'"))), cex.main = 3)

but that (the R code, not the plot result) is a bit ugly.
Nicer solutions are welcome...

well...

quote(widehat("f'"))
quote(widehat(f * "'"))
quote(widehat(f * minutes))

(I think that it is \widehat{f'} in LaTeX too, unless you mean
\hat{f}') 

quote(widehat(prime(f))) would be logical if you could push Paul to
implement prime(), but I'm not sure it is actually prettier.

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