how to make a median line thicker in bwplot (lattice)

On Feb 11, 2013, at 1:23 AM, Elaine Kuo wrote:

Hello,

I am drawing a boxplot using bwplot in lattice.
I would like to learn how to draw a thicker median line instead of the
default setting.
Thank you.

Code

bwplot(........,
   pch=rep("|",2))

At the moment panel.bwplot has code at the end that I think deals with
that aspect:

 if (all(pch == "|")) {
            mult <- if (notch)
                1 - notch.frac
            else 1
            panel.segments(levels.fos - mult * blist.height/2,
                blist.stats[, 3], levels.fos + mult * blist.height/2,
                blist.stats[, 3], lwd = box.rectangle$lwd, lty =
box.rectangle$lty,
                col = box.rectangle$col, alpha = alpha, identifier =
paste(identifier,
                  "dot", sep = "."))
        }
        else {
            panel.points(x = levels.fos, y = blist.stats[, 3],
                pch = pch, col = col, alpha = alpha, cex = cex,
                fontfamily = fontfamily, fontface =
chooseFace(fontface,
                  font), fontsize = fontsize.points, identifier =
paste(identifier,
                  "dot", sep = "."))
        }

So you need to find a way to change the box.rectangle$lwd setting
before this code is executed. Looking at

names(trellis.par.get())

It appears that graphic parameter can be set with trellis.par.set().

--
David.

Elaine

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David Winsemius, MD
Alameda, CA, USA