[R] png with ggplot on windows xp

[ONKELINX, Thierry]

Dear Juliet,

ggsave uses 300 dpi as default and the png device 72 dpi. The problem
seems to be that everything is scaled properly except the pointsize. At
least on WinXP. A work around is to increase the theme base_size from 12
to 50 (12 * 300 / 72 = 50).

p <- p + theme_gray(50)
ggsave(file = "myoutput2.png", p)

HTH,

Thierry


------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium 
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be 
www.inbo.be 

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens Juliet Hannah
Verzonden: vrijdag 10 april 2009 16:33
Aan: r-help at r-project.org
Onderwerp: [R] png with ggplot on windows xp

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

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