[R] plotting partial deriviatives

Uwe Ligges
Sun, 05 Mar 2006 13:43:51 -0000

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.
>
> Charles.Annis at StatisticalEngineering.com
> phone: 561-352-9699
> eFax:  614-455-3265
> http://www.StatisticalEngineering.com
>
>
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