'keep' parameter not working in version 0.9.0

[jdegen]

I am trying to have multiple plots share one legend. In the past I've
used opts(keep = "legend_box") to achieve this. I recently ran my old
code again and it no longer works. In the meantime I have updated
ggplot2 to version 0.9.0 and I'm using R 2.15 on Mac OS 10.6. I saw
this post that suggests the 'keep' parameter does not work in version
0.9.0:
http://groups.google.com/group/ggplot2/browse_thread/thread/9ecd549cc6ee6aa7/5644583fa3f17648?lnk=gst&q=keep#5644583fa3f17648

Is this generally the case, and if so, does anybody know of another
way to create a plot of only the legend, suppressing the panel, in
0.9.0? I'm reluctant to move back to 0.8.9...

Thanks,
judith

[Etienne B. Racine]

I don't have an answer, but here's a reproducible example that might illustrate the problem (from http://learnr.wordpress.com/2009/05/26/ggplot2-two-or-more-plots-sharing-the-same-legend/):

library("ggplot2")

library("grid")

p <- qplot(data = mtcars, mpg, hp, geom = "point", colour = cyl)

p1 <- p + opts(legend.position = "none")

p2 <- qplot(data = mtcars, wt, disp, geom = "point", colour = cyl) + opts(legend.position = "none")

legend <- p + opts(keep = "legend_box")

Layout <- grid.layout(nrow = 2, ncol = 2, widths = unit(c(2, 0.4), c("null", "null")), heights = unit(c(1, 1), c("null", "null")))

vplayout <- function(...) {

  grid.newpage()

  pushViewport(viewport(layout = Layout))

}

subplot <- function(x, y) viewport(layout.pos.row = x, layout.pos.col = y)

vplayout()

print(p1, vp = subplot(1, 1))

print(p2, vp = subplot(2, 1))

print(legend, vp = subplot(1:2, 2))

Etienne

[baptiste auguie]

Have a look at the updated wiki page:
https://github.com/hadley/ggplot2/wiki/Share-a-legend-between-two-ggplot2-graphs

baptiste

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[Etienne B. Racine]

Right. Thanks !

2012/5/9 baptiste auguie <baptist...@googlemail.com>