[Tex/LaTex] LaTex code inside gnuplot labels

cross-referencinggnuplotgnuplottex

I would like if could I use LaTex code inside gnuplot labels or even inside graph key, I'm using gnuplottex package and I like to make cross-referencing inside this labels, this is my MWE

\documentclass[8pt,a4paper,dvipsnames]{article}
\usepackage[utf8]{inputenc}
\usepackage[left=2cm,right=2cm,top=1.5cm,bottom=1.5cm]{geometry}

\usepackage{graphicx,gnuplottex,amsmath}

\begin{document}
\begin{equation}
y = x^2 \label{eq:x2}
\end{equation}
\begin{figure}[htp]
    \centering
    \begin{gnuplot}[scale=1.3, terminal=epslatex, terminaloptions=color dashed]
        set samples 50000
        set grid
        unset key
        set xrange [-3:1]
        set yrange [0:20]
        set label "$y=x^2$" at -0.5,1
        set label "\eqref{eq:x2}" at -0.5,3

        p x**2
    \end{gnuplot}
    \caption{\eqref{eq:x2} parabolic curve} \label{fig:FermDistNorm}
\end{figure}
\end{document}

Maybe gnuplottex is not enough to do this. Thank you so much! 🙂

Best Answer

In gnuplot, the backslash is used as an escape character, as it is in LaTeX. So, when latex calls gnuplot, gnuplot gobbles up the backslash, and latex is asked to process the title 'eqref{eq:x2}', which just means that the braces are removed, and you end up with 'eqrefeq:x2' as your label (in a nice font).

The solution is to stop gnuplot from interpreting the backslash as an escape character, which you can do by putting an extra backslash before eqref, or using single, rather than double, quotes. See pages 24-25 of the gnuplot 5 manual for more details.

\documentclass[8pt,a4paper,dvipsnames]{article}
\usepackage[utf8]{inputenc}
\usepackage[left=2cm,right=2cm,top=1.5cm,bottom=1.5cm]{geometry}

\usepackage{graphicx,gnuplottex,amsmath}

\begin{document}
\begin{equation}                                                                                                                                     
y = x^2 \label{eq:x2}                                                                                                                                
\end{equation}
\begin{figure}[htp]
    \centering
    \begin{gnuplot}[scale=1.3, terminal=epslatex, terminaloptions=color dashed]
        set samples 50000
        set grid
        unset key
        set xrange [-3:1]
        set yrange [0:20]
        set label "$y=x^2$" at -0.5,1
        set label "\\eqref{eq:x2}" at -0.5,3  #or use '\eqref{eq:x2}'

        p x**2
    \end{gnuplot}
    \caption{\eqref{eq:x2} parabolic curve} \label{fig:FermDistNorm}
\end{figure}
\end{document}

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[Tex/LaTex] Gnuplot inside LaTeX not working

If you run gnuplot <basename>-gnuplottex-fig1.gnuplot, you'll see gnuplot's error message

plot for [i=1:14] 'benchmarks/test.csv' u (\$0+1):i title ''.i.'00    kb' with linespoints
                                           ^
"texse-gnuplottex-fig1.gnuplot", line 16: invalid character \

gnuplot is stumbling over the \$. You don't need to escape the dollar sign in a gnuplot environment. If you remove the backslash, everything should work.

\documentclass{article}
\usepackage{gnuplottex}

\begin{document}
\begin{figure}[!ht]
\begin{gnuplot}[terminal=pdf, terminaloptions=color, scale=0.9]
set title 'Laptop Steps'
set datafile separator ','
set xlabel 'Query'
set ylabel 'Average time in ms(100 executions)'
set xrange [0:21]
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set grid ytics lt 0 lw 1 lc rgb '#bbbbbb'
set grid xtics lt 0 lw 1 lc rgb '#bbbbbb'
set key samplen 2 spacing .5 font ',8'
show grid
set style fill solid 0.8 border -1
set boxwidth 0.5 relative
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set out
\end{gnuplot}              
\end{figure}
\end{document}

[Tex/LaTex] Latex labels in gnuplot and pdf output

I may reply a bit too late, however, I had the same problem and I've found the solution here.

Basically you need to add a single additional key "standalone" to your terminal definition. I provide a MWE below (script.gp):

set terminal epslatex size 3.5,2.62 standalone color colortext 10
set output 'example.tex'
plot sin(x)

After that you run three more commands:

gnuplot script.gp
latex example.tex
dvips -o example.ps example.dvi

Finally, you can convert the resulting file to pdf. This is probably not the most optimal way to do what you need, however, it works.

UPDATE: Actually, that was a very long way to do this due to my lack of experience. You can reduce the number of steps like this:

gnuplot script.gp
latex example.tex
dvipdf example.dvi example.pdf

However, for some reason dvipdf started giving an empty pdf document some time ago (and I have no desire to dig deeper). You also can use latex directly through pdflatex, however, I get two pdf output files, one of them has no labels at all.

Best Answer

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