How to write expectation value symbols in gnuplot - gnuplot

Question

I need to write one of my axis label as $\langle\alpha\rangle$. I don't know how to get this Dirac notation in gnuplot. Can someone help.

Answer 1

One solution might be to use Gnuplot as a "pre-processing" tool in order to generate a template which is then compiled with LaTeX. To this end, consider for example following Gnuplot script:
set terminal lua tikz size 8cm,6cm clip background rgb '#ffffff'
set output 'frame.tex'
set xr [0:10]
set yr [0:10]
set xtics out nomirror
set ytics out nomirror
set key bottom right reverse spacing 2 width 2
set xlabel '$\langle\alpha\rangle$'
set ylabel '$f(\langle\alpha\rangle)$'
plot x t '$f(\langle\alpha\rangle)$'
When supplied to Gnuplot, it produces a file frame.tex. However, this is not a standalone LaTeX document, just the plot itself rendered with the famous TikZ package. Nevertheless, it is rather straightforward to embed it in a document as:
\documentclass[aip,jcp,reprint,amsmath,12pt]{revtex4-1}
\usepackage[utf8]{inputenc}
\usepackage[margin=0pt,papersize={8cm,6cm},headheight=0pt]{geometry}
\usepackage{graphicx}
\usepackage{tikz, fp, scalefnt, ifthen}
\usepackage{gnuplot-lua-tikz}
\usepgflibrary{fixedpointarithmetic}
\pagestyle{empty}
\setlength{\fboxsep}{0pt}
\setlength{\parskip}{0pt}
\setlength{\parindent}{0pt}
\begin{document}
\begin{widetext}
\input{frame.tex}%
\end{widetext}
\end{document}
If this file is called for example figure.tex, then pdflatex figure.tex produces: