Re: Problem with geom_histogram and facet_grid

[Ista Zahn]

Hi Bruce,

On Thu, Apr 18, 2013 at 3:27 PM, Bruce Koch <bruce...@gmail.com> wrote:
> I'm probably just doing something stupid, but I get this error message
> "invalid argument to unary operator" from this code:
>
> ggplot(CSIF_Customers,aes(optical)) + geom_histogram()
> + facet_grid (. ~ CSIF_Customers$Use_Level)

There are two problems with this: 1) the second '+' must be on the
same line as geom_histogram() and 2) facet_grid should specify just
the variable name, not the data.frame. Here is the corrected version:

ggplot(CSIF_Customers,aes(optical)) +
geom_histogram() +
facet_grid (. ~ Use_Level)

Best,
Ista

>
> The first line of code produces a single histogram containing all of the
> data.
>
> platform x86_64-w64-mingw32
> R version 2.15.3 (2013-03-01)
> ggplot 0.9.3.1
> run through R Studio 0.97.314
>
> The data is attached.
>
> Thanks,
>
> Bruce
>
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