Re: [R] Setting the colors of lines in a trellis plot...

From: Deepayan Sarkar <deepayan.sarkar_at_gmail.com>
Date: Tue 11 Jul 2006 - 04:27:49 EST

On 7/10/06, Jamieson Cobleigh <cobleigh@gmail.com> wrote:
> With some help from those with expertise on this list, I managed to
> produce a plot using trellis that looked like I wanted it to look.
> Now, I need to take the same plot and make the lines on it color, but
> I want to specify the color for the lines myself.
>
> I've managed to make the key use the colors I want. I've managed to
> make the symbols of the actual plot use the colors I want. But I have
> been unable to find the correct incantation to make the lines of the
> actual plot use the colors I want. Here's the relevant section of
> code:
>
> mycolors <- c("black", "darkgreen", "red")
>
> mylines <- Rows(superpose.line, 1:numlines);
> mylines$col <- mycolors
>
> mysymbols <- Rows(superpose.symbol, 1:numlines);
> mysymbols$pch <- c(15:18)[1:numlines]
> mysymbols$col <- mycolors
>
> print(xyplot(
> panel = panel.superpose,
> log10(states) ~ size,
> groups=category,
> data=data,
> type='b',
> lwd = 2,
> par.settings = list(superpose.symbol=mysymbols),

You have forgotten to add 'superpose.line=mylines'.

> ylim=c(y_min, y_max),
> scales = list(tck=c(1, 0), axs="r",
>
> x=list(tick.number=(xmax - xmin + 1), at=xmin:xmax,
> labels=xmin:xmax, cex=1.75),
>
> y=list(axs="r", rot=c(90, 0), labels=y_labels,
> at=y_at, cex=1.75
> )
> ),
> key = list (
> text = list(levels(data$category)),
> lines = list(type="b",
> lty=mylines$lty,
> pch=mysymbols$pch,
> cex=rep(1.25, numlines),
> col=mylines$col),

You might consider using the 'auto.key' argument instead of 'key' (YMMV).

-Deepayan

> x = .98,
> y = .25,
> corner=c(1,0)
> ),
> xlab = list(label="System Size", cex=2),
> ylab = list(label="States", cex=2),
> ))
>
>
> Can anyone help me out with this?
>
> Thanks!
>
> Jamie



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