R help - Oct 2010 - ggplot2: facet_grid with only one level does not display the graph with the facet_grid level in title

Hi All,

Here is the code that I'll be referring to:

p <- ggplot(wastran.data, aes(PER_KEY, EVENTS))
(p <- p +
    facet_grid( pool.short ~ .) +
    stat_summary(aes(y=EVENTS), fun.y = sum, geom="line") +
    opts(axis.text.x = theme_text(angle = 90, hjust=1), title="Events
(15min.) vs. Time: Facet pool", strip.text.y = theme_text())
)


Now, depending on preceding parameters, the 'pool.short' factor variable
in
'wastran.data' can have one distinct factor level or it can have more
than
one.  When 'pool.short' has more than one factor level, the graph
performs
as I expect, with multiple rows of graphs with the value of the
'pool.short'
variable displayed on the right-hand side of the graph.  When
'pool.short'
has only one factor level, the value is NOT displayed on the right-hand
side.  However, I'd still like it displayed, even though it has only one
value.

Can someone tell me how to tweak this code to make it still display when it
has only 1 factor level?  If this code is unclear, I will be happy to take
some time and generate an artificial but reproducible self-contained
example.  I left in the stat_summary layer in this code in case it is
interfering with the desired output (but I suspect is is superfluous, but I
am not confident enough to say that with absolute certainty).

Thanks,
Matt

	[[alternative HTML version deleted]]

This is on my to do list:
https://github.com/hadley/ggplot2/issues/labels/facet#issue/107

Hadley

On Thu, Oct 28, 2010 at 11:51 AM, Matthew Pettis
<matthew.pettis at gmail.com> wrote:
> Hi All,
>
> Here is the code that I'll be referring to:
>
> p <- ggplot(wastran.data, aes(PER_KEY, EVENTS))
> (p <- p +
> ? ?facet_grid( pool.short ~ .) +
> ? ?stat_summary(aes(y=EVENTS), fun.y = sum, geom="line") +
> ? ?opts(axis.text.x = theme_text(angle = 90, hjust=1), title="Events
> (15min.) vs. Time: Facet pool", strip.text.y = theme_text())
> )
>
>
> Now, depending on preceding parameters, the 'pool.short' factor
variable in
> 'wastran.data' can have one distinct factor level or it can have
more than
> one. ?When 'pool.short' has more than one factor level, the graph
performs
> as I expect, with multiple rows of graphs with the value of the
'pool.short'
> variable displayed on the right-hand side of the graph. ?When
'pool.short'
> has only one factor level, the value is NOT displayed on the right-hand
> side. ?However, I'd still like it displayed, even though it has only
one
> value.
>
> Can someone tell me how to tweak this code to make it still display when it
> has only 1 factor level? ?If this code is unclear, I will be happy to take
> some time and generate an artificial but reproducible self-contained
> example. ?I left in the stat_summary layer in this code in case it is
> interfering with the desired output (but I suspect is is superfluous, but I
> am not confident enough to say that with absolute certainty).
>
> Thanks,
> Matt
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/