[R] problem with ggplot2 boxplot, groups and facets

stephen sefick ssefick at gmail.com
Wed May 6 03:21:49 CEST 2009

If you would provide a reproducible example I could tinker.

Stephen Sefick

On Tue, May 5, 2009 at 4:59 PM, Zeljko Vrba <zvrba at ifi.uio.no> wrote:
> I have a following problem:
> The call
> qplot(wg, v.realtime, data=df.best.medians$gv1, colour=sp,  geom="boxplot")
> works nice: for each value of the wg factor I get two box-plots (two levels in
> the sp factor) in different colours, side-by-side, centered at the wg x-axis.
> However, I want to separate the data belonging to different levels of the n
> factor, so I add the facets option:
> qplot(wg, v.realtime, data=df.best.medians$gv1, facets = . ~ n,
>  colour=sp, geom="boxplot")
> At this point, the things break with more than 50 warnings, here are the
> first few:
> 1: In Ops.factor(width, n) : / not meaningful for factors
> 2: In Ops.factor(n, 1) : - not meaningful for factors
> 3: In Ops.factor(2, n) : * not meaningful for factors
> 4: In Ops.factor(d_width, n) : / not meaningful for factors
> Interestingly enough, removing the colour option, also produces a boxplot,
> but now the data for the two levels of sp are drawn in the same box, i.e.,
> the following works:
> qplot(wg, v.realtime, data=df.best.medians$gv1, facets = . ~ n, geom="boxplot")
> but does not plot what I want.
> Any suggestions for a workaround?
> Thanks.
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Stephen Sefick

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make us feel like gods.  We are mammals, and have not exhausted the
annoying little problems of being mammals.

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