
I have the same problem. I am using R on our bioinformatics server. From what
I have read jpeg() needs to use a widows graphics device like X11 to be able
to generate a jpeg file.
I am also very curious to see if anyone knows a solution, now I need to use
pdf() of ps() which is more time consuming and uses more diskspace.

> jpeg()
Error in X11(paste("jpeg::", quality, ":", filename, sep = ""), width,  :
unable to start device JPEG
In addition: Warning message:
In jpeg() : unable to open connection to X11 display ''
> capabilities()
    jpeg      png    tcltk      X11 http/ftp  sockets   libxml     fifo
   FALSE    FALSE     TRUE    FALSE     TRUE     TRUE     TRUE     TRUE
  cledit    iconv      NLS  profmem
    TRUE     TRUE     TRUE    FALSE


Haiyan Pan wrote:
> 
> r-help，
>  When I want to use jpeg() in R-2.1.1 which is installed in linux platform
> to generate a jpeg file, the error occurs as following:
>  
>  > jpeg()
> Error in X11(paste("jpeg::", quality, ":", filename, sep = ""), width,  : 
>         unable to start device JPEG
> In addition: Warning message:
> unable to open connection to X11 display '' 
>> capabilities()  
>     jpeg      png    tcltk      X11 http/ftp  sockets   libxml     fifo 
>    FALSE    FALSE     TRUE    FALSE     TRUE     TRUE     TRUE     TRUE 
>   cledit  IEEE754    iconv 
>     TRUE     TRUE     TRUE 
> 
> X11 device is existed in this machine, would you suggest me how to resolve
> this problem. 
> Many thanks for your help and it will be greatly appreciated!
> 	
> 
> 
> = = = = = = = = = = = = = = = = = = = = 
>   
>  Haiyan Pan
>  hypan@scbit.org
> 
>  Tel: 021-64363311-123
>  Shanghai Center for Bioinformatics Technology
>  Floor 12th,100# QinZhou Road
>  Shanghai,China,200235
> 
> 
> ______________________________________________
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> PLEASE do read the posting guide!
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> 

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