Ista:

Your attached code did work for me; moreover, the facets were presented in
the desired order with facet_wrap() and facet_grid(), which is what I'm
using because I have a second factor used in facet_grid().

Still, my plots with total.density as a facet are coming out in 16, 32, 8,
and I'm not seeing why.  Below is my plot code -

ggplot(ag.tab[ag.tab$plant.sp == 'EC',], aes(x = days.out, y = per.remain))
> + facet_grid(total.density ~ prop.ec) +
>     #add point and error bar data
>     theme_set(theme_bw()) +
>     geom_point() + geom_errorbar(aes(ymin = per.remain - se, ymax =
> per.remain + se), width = 3) +
>     #add predicted model data
>     geom_line(data = se.predict.data[se.predict.data$plant.sp == 'EC',],
> aes(x = x.values, y = predicted.values), colour = c('red')) +
>     geom_line(data = dc.predict.data[dc.predict.data$plant.sp == 'EC',],
> aes(x = x.values, y = predicted.values), colour = c('blue'), linetype =
> c('dashed')) +
>
>     xlab('Day') + ylab('Percent Mass Remaining') + opts(panel.grid.major =
> theme_blank(), panel.grid.minor = theme_blank())

Is there anything odd about it that might be producing the odd ordering
problem?  FYI, avoiding subsetting ag.tab doesn't do the trick.
-
Justin Montemarano
Graduate Student
Kent State University - Biological Sciences

http://www.montegraphia.com


On Wed, Mar 21, 2012 at 11:42 AM, Ista Zahn <istazahn@gmail.com> wrote:

> Hi Justin,
>
> this gives the correct order (8, 16, 32) on my machine:
>
> total.density <-
>
> c(8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32)
> total.density <- factor(total.density, levels=c(8, 16, 32), ordered=TRUE)
> str(total.density)
>
> order(levels(total.density))
>
> dat <- data.frame(td = total.density, v1 = rnorm(1:length(total.density)))
>
> ggplot(dat, aes(x = v1)) +
>  geom_density() +
>  facet_wrap(~td)
>
> Does it work for you? If yes, then you need to tell us what you're
> doing that is different from this example. If no, please give use the
> output of sessionInfo().
>
> best,
> Ista
>
> On Wed, Mar 21, 2012 at 11:16 AM, Justin Montemarano <jmontema@kent.edu>
> wrote:
> > I think I understand, but I believe my original interest is in the order
> of
> > levels(total.density), since ggplot appears to be using that to order the
> > facets.  Thus, I'm still getting three graphs, ordered (and displayed as)
> > 16 to 32 to 8, rather than the more intuitive, 8 to 16 to 32.  I'm sorry
> if
> > I wasn't clear and/or I've missed your message.
> > -
> > Justin Montemarano
> > Graduate Student
> > Kent State University - Biological Sciences
> >
> > http://www.montegraphia.com
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>

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