Hi dear all,

In my laptop(ubuntu 11.10 64bit), I maintained a released R (2.14) and a
developmental R, I can specify qplot(..., alpha = ) in R 2.14 , but when I
try to use transparency in developmental R, I got a warning message and the
plot is clearly not I want.

minimal example:
> qplot(data = mtcars, x = mpg, y = cyl, alpha = cyl)
Warning message:
In grid.Call.graphics(L_points, x$x, x$y, x$pch, x$size) :
  semi-transparency is not supported on this device: reported only once per
page
> sessionInfo()
R Under development (unstable) (2012-01-21 r58156)
Platform: x86_64-unknown-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
 [7] LC_PAPER=C                 LC_NAME=C
 [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C

attached base packages:
[1] grid      stats     graphics  grDevices utils     datasets  methods
[8] base

other attached packages:
[1] ggplot2_0.8.9 proto_0.3-9.2 reshape_0.8.4 plyr_1.7.1

loaded via a namespace (and not attached):
[1] digest_0.5.1


I have no idea what happened here, because if I miss some important system
dependencies, why it's still working in R 2.14?

Any suggestions or possible solution will be really appreciated. Thanks

Tengfei

-- 
Tengfei Yin
MCDB PhD student
1620 Howe Hall, 2274,
Iowa State University
Ames, IA,50011-2274

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