Hi

I wish to be able to plot in Octave/R inside a sagecell.
Therefore, I just set up a sagecell server using the instructions here
https://github.com/sagemath/sagecell


I compiled my own sagecell server because when you use 
https://sagecell.sagemath.org 
you get the following when trying to plot in R:
"Error in png() : X11 is not available"
https://sagecell.sagemath.org/?z=eJwryMkv0UjWMNRRMNZRMNNRMNFRsNTUBABEDAT8&lang=r
and in Octave you only get a Ascii plot
https://sagecell.sagemath.org/?z=eJwryMkv0Yg21DGM1QQAFu8DVw==&lang=octave

Using my own server plotting in R gives me nothing 
(not even "Error in png() : X11 is not available")
and Octave still gives me only Ascii.

I have two related questions:
1. Is it possible to get R plots in sagecell?
2. Is it possible to get Octave non-ascii plots in sagecell?

When I look at the log files (./sage/logs/pkgs/r-3.2.2.p0.log) it seems 
that X11 and png is used:
"using X11 ... yes" etc.  
Btw I'm using xubuntu 15.10. 

Cheers,
Benedikt

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