How to create (vertically) faceted plots in ggplot2 with dynamic heights such that all facets have the same scale?

[Yang Zhang]

I'm trying to create faceted plots where all facets have the same
scale but potentially different sizes. I'm trying the following:

qplot(score, ..count.., data=df, geom='density', position='stack') +
facet_grid(method~., scales='free', space='free')

but I get:

Error in if (length(range) == 1 || diff(range) == 0) { :
missing value where TRUE/FALSE needed

I'm also not sure whether this is what I want - it seems from the
examples in http://had.co.nz/ggplot2/facet_grid.html that
scales='free' allows the scales to vary among the facets, whereas I'd
like them to be fixed. But simply specifying space='free' seems to
have no effect.

Thanks in advance.

[Hadley Wickham]

It's currently not possible to have un-equaled sized facets, except
for the special case where they're proportional to the scale ranges.

Hadley

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[Yang Zhang]

That's actually exactly what I was trying to get. This incantation
ended up working for me:

qplot(score, ..count.., data=df, geom='density', fill=I('black')) +
opts(strip.text.y = theme_text()) +
scale_y_continuous(breaks=seq(0,999,by=50)) +
facet_grid(method~., scale='free', space='free'))