[R] Superscripts and subscripts in trellis graphics

[Simon Pickett]

Hi Steve,

you need to use the expression() function. I think it is described under 
?plotmath. Defo works with mtext, not sure about ylab.

try

ylab(text=c(expression(paste("Hatched Eggs R"^{2}))))

etc.

----- Original Message ----- 
From: <Steve_Friedman at nps.gov>
To: <r-help at r-project.org>
Sent: Monday, May 18, 2009 3:25 PM
Subject: [R] Superscripts and subscripts in trellis graphics


>
> I'd like to annotate an xyplot with an R^2 value, but can not find the
> syntax to define the superscript format for the text.
>
> I'd appreciate suggestions,
>
> xyplot(SharkSloughEggs.df$Sharkeggs.rel +
> SharkSloughEggs.df$SharkHatched.rel + SharkSloughEggs.df$SharkFlooded.rel 
> +
> HSI.shark$MEAN ~ Year,
>           pch=c(1,9,5,4), lty=c(1,6,3,4), lwd = c(2), col = c("black",
> "blue", "green", "red"),
>           scales=list(tick.number=length(Year)), data=SharkSloughEggs.df,
> ylab="Relative Egg Success",
>           main="Shark Slough Alligators",
>           par.settings = graph.sets,  type = "b")
>                 trellis.focus()
>                    panel.text(x=1999, y = 0.95, labels="Hatched Eggs\nR^2
> = -0.18", cex = 0.75)
>                    panel.text(x=1998, y = 0.35, labels="Number of
> Eggs\nR^2 = 0.43",cex = 0.75)
>                    panel.text(x=1995, y = 0.25, labels="Flooded Eggs\nR^2
> = -0.50", cex = 0.75)
>                    panel.text(x=1986, y = 0.3, labels="Mean HSI", cex =
> 0.75)
>                 trellis.unfocus()
>
>
> Thanks
> Steve
>
>
> Steve Friedman Ph. D.
> Spatial Statistical Analyst
> Everglades and Dry Tortugas National Park
> 950 N Krome Ave (3rd Floor)
> Homestead, Florida 33034
>
> Steve_Friedman at nps.gov
> Office (305) 224 - 4282
> Fax     (305) 224 - 4147
>
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