Charles Annis, P.E. wrote:
> Dear R Helpers:
>
> I am trying to annotate a plot. The following code snippet works, but it is
> kind of a kludge since it adds the partial derivative symbols after creating
> the plotmath frac(). Is there a more elegant way to write a partial
> derivative?
See ?plotmath: There is "partialdiff"!
text(1.6, 1, expression(slope == frac(partialdiff * f(hat(theta)),
partialdiff * hat(theta))))
Uwe Ligges
> dev.off()
>
> plot(NA, xlim=c(-3,3), ylim=c(0,1.6), xlab="", ylab="", tck=-0.015)
>
> text(1.6, 1, expression(paste("slope = ", frac(paste(" f( ", hat(theta),
> " )"), hat(theta))), sep=""), adj=0)
>
> text(2.25, 1.03, "\\pd", vfont=c("sans serif","plain"))
>
> text(2.3, 0.934, "\\pd", vfont=c("sans serif","plain"))
>
>
>
> Thanks.
>
>
> Charles Annis, P.E.
>
> [EMAIL PROTECTED]
> phone: 561-352-9699
> eFax: 614-455-3265
> http://www.StatisticalEngineering.com
>
>
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