Can not save plot to png file correctly

[Peng Yu]

library(ggplot2)

data=data.frame(
X=sample(10,1000,replace=T)
, Y=letters[1:10]
)

p=qplot(X, data=data, geom='histogram') + facet_wrap( ~ Y)
save(p, file='error.png')

The above qplot work properly if I don't plot it to a file. But if I
plot it to a png file, the png file is always corrupted. Would you
please let me know what is wrong?

--
Regards,
Peng

[Felipe Carrillo]

You can save as png like this too:

library(ggplot2)
data=data.frame(
  X=sample(10,1000,replace=T)
  , Y=letters[1:10])

png("mypng.png")

qplot(X, data=data, geom='histogram') + facet_wrap( ~ Y)

dev.off()
 
Felipe D. Carrillo
Supervisory Fishery Biologist
Department of the Interior
US Fish & Wildlife Service
California, USA

--
>
Regards,
Peng

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[Felipe Carrillo]

With ggsave the graph windows pops up but using:

png("mypng.png")
qplot(X, data=data, geom='histogram') + facet_wrap( ~ Y)
dev.off()

The graph is saved in the background
Is there a way to hide the graph window when
using ggsave?

[Hadley Wickham]

> p=qplot(X, data=data, geom='histogram') + facet_wrap( ~ Y)
> save(p, file='error.png')
>
> The above qplot work properly if I don't plot it to a file. But if I
> plot it to a png file, the png file is always corrupted. Would you
> please let me know what is wrong?

Save is for storing a binary representation of R objects on disk, not
for saving images.

Hadley

--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/

[Bunny, lautloscrew.com]

Peng Yu, 

filename="my.pdf"

ggsave(filename,scale=1.5)

worked perfectly fine for me with virtually any plot created with qplot.

HTH

matt

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