It seems to have something to do with my other library dependencies that
has broken the plotting. I tried to re-install R-3.0.2 again and I am
getting the same error for that R version too.

Been scouring the web for advice:

http://stackoverflow.com/questions/10777008/how-to-set-cairo-as-default-backend-for-x11-in-r
http://r.789695.n4.nabble.com/ggplot-2-semi-transparency-error-td902379.html

But it seems that these solutions have to do with saving the plot. I am
just trying to plot it in the R Console...



On Fri, Apr 25, 2014 at 7:06 PM, Ulises M. Alvarez <uma@sophie.unam.mx>wrote:

> On 04/25/2014 07:26 PM, Fong Chun Chan wrote:
>
>> Hi all,
>>
>> I recently upgraded to R-3.1.0 from R-3.0.2. Things seem to be fine, but
>> when trying to plot a ggplot image with transparency, I get the following
>> issue:
>>
>> Warning message:
>> In grid.Call.graphics(L_polygon, x$x, x$y, index) :
>>    semi-transparency is not supported on this device: reported only once
>> per
>> page
>>
>> This only appears to affect my R-3.1.0 installation and not my R-3.0.2 as
>> I
>> can still plot normally with it. Has anyone else experienced this problem?
>>
>> Thanks,
>>
>
> Hi:
>
> After the upgrade to 3.1.0, did you execute?
>
> update.packages(checkBuilt=TRUE)
>
> I did it, and I have no problem running the code that you provide.
>
> sessionInfo()
> # R version 3.1.0 (2014-04-10)
> # Platform: x86_64-pc-linux-gnu (64-bit)
> #
> # locale:
> #  [1] LC_CTYPE=en_US.utf8       LC_NUMERIC=C
> #  [3] LC_TIME=en_US.utf8        LC_COLLATE=en_US.utf8
> #  [5] LC_MONETARY=en_US.utf8    LC_MESSAGES=en_US.utf8
> #  [7] LC_PAPER=en_US.utf8       LC_NAME=C
> #  [9] LC_ADDRESS=C              LC_TELEPHONE=C
> # [11] LC_MEASUREMENT=en_US.utf8 LC_IDENTIFICATION=C
> #
> # attached base packages:
> # [1] stats     graphics  grDevices utils     datasets  methods
> # base
> #
> # other attached packages:
> # [1] ggplot2_0.9.3.1
> --
> Ulises M. Alvarez
> http://sophie.unam.mx/
>

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