R help - Aug 2015 - Error in .External2(C_X11, paste("png::", filename, sep = ""), g$width, : unable to start device PNG

Hello,

I have the following reproducible knitr document:

\documentclass{article}
\usepackage[sc]{mathpazo}
\usepackage[T1]{fontenc}
\usepackage{geometry}

\begin{document}

<<test,dev="png",echo=FALSE>>library(lattice)
xyplot(1:2~1:2)
@

\end{document}


but knitr is giving me an error:

Quitting from lines 9-11 (test.Rnw)
Error in .External2(C_X11, paste("png::", filename, sep =
""), g$width,  :
  unable to start device PNG
In addition: Warning message:
In (function (filename = "Rplot%03d.png", width = 480, height = 480, 
:
  unable to open connection to X11 display ''

I don't have X11 installed in this machine and I was hoping not to have to. 
I am guessing that this is the problem right?

Any suggestions??

Thanks,
Ramiro


	[[alternative HTML version deleted]]

>From my experience, that is often an indication that you built R from
source but didn't pay attention to the cairo/pango dependencies. You
can either install R from a repository, or make sure you have all the
dependencies installed before you build R from source (e.g. for
Ubuntu, use apt-get build-dep r-base-dev).

Regards,
Yihui
--
Yihui Xie <xieyihui at gmail.com>
Web: http://yihui.name


On Tue, Aug 11, 2015 at 8:32 AM, Ramiro Barrantes
<ramiro at precisionbioassay.com> wrote:
> Hello,
>
> I have the following reproducible knitr document:
>
> \documentclass{article}
> \usepackage[sc]{mathpazo}
> \usepackage[T1]{fontenc}
> \usepackage{geometry}
>
> \begin{document}
>
> <<test,dev="png",echo=FALSE>>> library(lattice)
> xyplot(1:2~1:2)
> @
>
> \end{document}
>
>
> but knitr is giving me an error:
>
> Quitting from lines 9-11 (test.Rnw)
> Error in .External2(C_X11, paste("png::", filename, sep =
""), g$width,  :
>   unable to start device PNG
> In addition: Warning message:
> In (function (filename = "Rplot%03d.png", width = 480, height =
480,  :
>   unable to open connection to X11 display ''
>
> I don't have X11 installed in this machine and I was hoping not to have
to.  I am guessing that this is the problem right?
>
> Any suggestions??
>
> Thanks,
> Ramiro