# pgfplots external with large dataset (lualatex?)

I have fairly large datasets with densely strucutred data that i cant downsampe much without loosing structure. I use TexMaker on Ubuntu 14.04LTS. I use

\usepackage{tikz,pgfplots,pgfplotstable}
\pgfplotsset{compat=1.9}
\usepgfplotslibrary{external}
\tikzexternalize

and

\tikzsetnextfilename{figs/test1}

to externalize the figures. This works good compiling with pdflatex -shell-escape. But as the data becomes to large I am out of memory. I am trying to compile using LuaLaTeX -shell-escape instead of pdfLatex but get the following error message:

! Package tikz Error: Sorry, the system call 'pdflatex -halt-on-error -interact
ion=batchmode -jobname "figs/test1" "\def\tikzexternalrealjob{article}\input{ar
ticle}"' did NOT result in a usable output file 'figs/test1' (expected one of .
pdf:.jpg:.jpeg:.png:). Please verify that you have enabled system calls. For pd
flatex, this is 'pdflatex -shell-escape'. Sometimes it is also named 'write 18'
or something like that. Or maybe the command simply failed?

so pgfPlots seem to call pdfLatex without the appropriate -shell-escape flag and without me specifying it. How can i get this to compile in LuaLatex? or can i compile only the figures in LuaLatex and the rest in pdfLatex (the opposite of what is happening now)? I found this and this example but neither helped me...

Thankfull for help and i am also thankful for any general advice that can help me resolve the problem of ploting larger data sets in pgfplots.

Cheers /J

• Why not try to run it with -shell-escape first? First from the command line, then after setting whatever thing TexMaker requires (which I've never used, but it boggles the mind to think there is no question here about how to configure TexMaker).... – jon Jul 1 '15 at 18:18
• well, i get the same error from the command linte just running lualatex -shell-escape article.tex so the issue seem not to stem from texmaker, but from what external calls are made from pgfplots/tikz, as suggested by the error message. – Jonatan Öström Jul 2 '15 at 11:10

So i kind of solved the problem with some help form the pgfplots manual pages 470-2, and this other question. I have this in my preamble:

\usepackage{tikz,pgfplots,pgfplotstable}
\pgfplotsset{compat=1.9}
%\usetikzlibrary{external}
\usepgfplotslibrary{external}
\tikzexternalize

\tikzset{external/system call={lualatex -shell-escape -halt-on-error -interact
ion=batchmode -jobname "\image" "\texsource"}}