# [R] plot math Q: How to "plot" hat(f') ?

Peter Dalgaard BSA p.dalgaard at biostat.ku.dk
Wed Jun 13 19:43:37 CEST 2001

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.

--
O__  ---- Peter Dalgaard             Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics     2200 Cph. N
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~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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