[R] X11 is not availble

[Dennis Schmidt]

Hi Barry,

this is the output of my capabilities() call:

jpeg      png     tiff    tcltk      X11     aqua http/ftp  sockets
    FALSE    FALSE    FALSE    FALSE    FALSE    FALSE     TRUE     TRUE
   libxml     fifo   cledit    iconv      NLS  profmem    cairo
     TRUE     TRUE     TRUE     TRUE     TRUE    FALSE    FALSE

How do I install these png-devel library and header? (I'm sorry, my  
Unix knowledge isn't really THAT big ;-))
Tried apt-get, but that doesn't find anything linke png-dev or png- 
devel...

Dennis

Am 18.12.2008 um 13:54 schrieb Barry Rowlingson:

> 2008/12/18 Dennis Schmidt <Dennis.Schmidt at student.hpi.uni-potsdam.de>:
>> No, haven't seen this so far. But it quite looks like what I'm  
>> looking for,
>> so thanks a lot :-)
>
> The png() device does not need an X server to connect to. I think it
> used to in versions gone by, but not any more. Here I've disabled X so
> that X11() doesn't work, but png() still does:
>
>> x11()
> Error in X11(d$display, d$width, d$height, d$pointsize, d$gamma,
> d$colortype,  :
>   unable to start device X11cairo
> In addition: Warning message:
> In x11() : unable to open connection to X11 display ''
>> png(file="foo2.png")
>> plot(1:10)
>> dev.off()
> null device
>          1
>
> I suspect your R was compiled without png support. What does the
> 'capabilities()' function in R tell you?
>
>> capabilities()
>    jpeg      png     tiff    tcltk      X11     aqua http/ftp  sockets
>    TRUE     TRUE     TRUE     TRUE    FALSE    FALSE     TRUE     TRUE
>  libxml     fifo   cledit    iconv      NLS  profmem    cairo
>    TRUE     TRUE     TRUE     TRUE     TRUE     TRUE     TRUE
>
> - I've got png capability - have you? If not, you need to recompile
> and find out why. When you run configure it should tell you what
> capabilities it has figured out for itself. To get png support you'll
> need the png-devel library and header files.
>
> Anything else is speculation until we see capabilities()....
>
> Barry