Thanks for your reply.

I wrote  a script, namely my_script and run it as
R < my_script > res --no-save &

my_script contains:

library (geneplotter)
library (grDevices)
hist (mat) # mat is a matrix
savepng ("Rtmp", ".")
dev.off()
q("no")

***********************************3
so Rtmp.png is created at the end but with 0 byte and res (output file) contains:
> library (geneplotter)
> library (grDevices)
> hist (mat)
> savepng ("Rtmp", ".")
[1] "./Rtmp.png"
> dev.off()
null device
          1
> q("no")


but when running in R:
*****************************
library (geneplotter)
Loading required package: annotate
Loading required package: Biobase
Loading required package: tools

Welcome to Bioconductor

  Vignettes contain introductory material. To view, type
  'openVignette()'. To cite Bioconductor, see
  'citation("Biobase")' and for packages 'citation(pkgname)'.

Loading required package: lattice
KernSmooth 2.22 installed
Copyright M. P. Wand 1997
> library (grDevices)
> hist (mat)
> savepng ("Rtmp", ".")
[1] "./Rtmp.png"
> dev.off()
null device
          1
> q("no")

./Rtmp.png is created correctly (a non-zero byte image)

I use R 2.5.1

thanks

Florian Hahne <fhahne@fhcrc.org> wrote: Hi Carol,
In order to save graphics on a file device you need to properly close  
this device after the plotting, that is, use dev.off() I am not sure  
what you mean by "running R in the background". Did you start it via R  
CMD batch or something similar as a background process? In any case,  
the proper use of jpeg() and dev.off() should create a valid image  
file irespective of that, unless you are on remote machine without x11  
port forwarding, which again should result in a number of errors.
Sending a brief example of code that illustrates your problem and at  
least some information about your R version would also help
Cheers
Florian



On 14.04.2008, at 08:22, carol white  wrote:

> Hi,
> I tried to use savepng (library geneplotter) or jpeg (grDevices) to  
> save the R output image in a file. When I run R in foreground,  
> savepng saves the image in a file but when I run R in background (in  
> a unix terminal shell), a file is created but with 0 byte. When the  
> jpeg is used in R in bg or fg, a file is created with 0 byte. Why is  
> the image not saved when I run the R in bg?
>
> Regards,
>
> carol
>
>
>
>
>       
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