Tikz inside gnuplottex - latex

Question

Here is such a code.
\documentclass{standalone}
\usepackage[miktex]{gnuplottex}
\usepackage[utf8]{inputenc}
\begin{document}
\begin{gnuplot}
set terminal epslatex color
set xrange [-4:4]
set yrange [0:16]
set xlabel '$x$'
set ylabel '$y$'
plot x**2 title '$y=x^2$'
\end{gnuplot}
\end{document}
Is it possible to draw primitives using tikz in a coordinate system created by gnuplot, similar to pgfplots? For example, \draw (axis cs:0 , 0) -- (axis cs:1 , 1);

Answer 1

There are probably many ways of doing so, here is a solution using the tikzlibrary tikzmark, which puts a custom mark called "a" in the ylabel string (but which could also be placed by an arbitrary set label command).
Your code was not compilable for me; one of the reasons is that the set terminal command has to be provided as an option to \begin{gnuplot} instead of inside the gnuplot code. Since you want to use tikz I would recommend to use the tikz terminal anyway.
\documentclass{standalone}
\usepackage{gnuplot-lua-tikz}
\usepackage{gnuplottex}
\usepackage[utf8]{inputenc}
\usetikzlibrary{tikzmark}
\begin{document}
\begin{gnuplot}[terminal=tikz]
set xrange [-4:4]
set yrange [0:16]
set xlabel '$x$'
set ylabel '$\tikzmark{a}y$'
plot x**2 title '$y=x^2$'
\end{gnuplot}
An arrow going from the $y$ label to exactly here.\tikz[remember picture, overlay] \draw[<-, bend angle = 10, bend right] (0,0) to (pic cs:a);
\end{document}