[R] png with ggplot on windows xp

[Juliet Hannah]

Hi Group,

I posted this question on the ggplot list and was advised to try here
also. The code
below produces a plot as a png and pdf. The pdf looks great, and I cannot
make the png look this way.  I've tried various combinations of
height, width, and dpi, but it has not worked out so
far. Any suggestions to make the png look like the pdf? I received a
response that
the problem does not occur on a Mac, so it may be unique to XP.
Thanks for your time. -- Juliet

myData <- read.table(textConnection("0.0050      0.70                2903
     0.0050      0.80                3406
     0.0050      0.90                4170
     0.0070      0.70                2072
     0.0070      0.80                2431
     0.0070      0.90                2976
     0.0090      0.70                1610
     0.0090      0.80                1889
     0.0090      0.90                2312
     0.0130      0.70                1112
     0.0130      0.80                1305
     0.0130      0.90                1598
     0.0150      0.70                 963
     0.0150      0.80                1130
     0.0150      0.90                1383
     0.0170      0.70                 849
     0.0170      0.8000                 996
     0.0170      0.9000                1219
     0.021       0.7                   686
     0.021       0.8                   805
     0.021       0.9                   985"),header=FALSE)
closeAllConnections();
colnames(myData) <- c("Effect","Power","N")
p <- ggplot(data=myData,aes(x=Effect,y=N))
p <- p+geom_point(aes(shape=factor(Power))) +
geom_line(aes(group=factor(Power)))
p <- p+scale_x_continuous(expression("Effect Size as "*R^2))
p <- p + scale_shape(name="Power")

ggsave(file = "myoutput1.png")
ggsave(file = "myoutput1.pdf")



> sessionInfo()
R version 2.8.1 (2008-12-22)
i386-pc-mingw32

locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252

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

other attached packages:
[1] ggplot2_0.8.2 reshape_0.8.2 plyr_0.1.5    proto_0.3-8