我正在尝试使用制作费曼图feynmf。我的代码是
\documentclass[a4paper,11pt]{article}
\usepackage{xcolor}
\usepackage{amsthm}
\theoremstyle{definition}
\newtheorem{exe}{Exercise}
\newcommand*{\mybox}[2]{\colorbox{#1!30}{\parbox[t]{.88\linewidth}{#2}}}
%~~~~~~~~~~~~~~~~~~~~Feynman Diagramms~~~~~~~~~~~~~~~~~~~~~~~~~~
\usepackage{feynmp}
\DeclareGraphicsRule{.1}{mps}{.1}{}
%\DeclareGraphicsRule{*}{mps}{*}{}
%
\makeatletter
\def\endfmffile{%
\fmfcmd{\p@rcent\space the end.^^J%
end.^^J%
endinput;}%
\if@fmfio
\immediate\closeout\@outfmf
\fi
\ifnum\pdfshellescape=\@ne
\immediate\write18{mpost \thefmffile}%
\fi}
\makeatother
\begin{document}
\begin{exe}\mybox{gray}{Show that $g_{\mu\nu}g^{\mu\nu}=4$}\\
\noindent\textbf{Solution:} \unitlength = 1mm
\begin{figure}[H]
\centering
\begin{fmffile}{pair} %file.mf will be created for this feynman diagram
\fmfframe(1,7)(1,7){ %Sets dimension of Diagram
\begin{fmfgraph*}(70,45) %Sets size of Diagram
\fmfleft{i1} %Sets there to be 2 sources
\fmfright{o1,o2} %Sets there to be 2 outputs
\fmflabel{$\gamma$}{i1} %Labels one of the left sources
% \fmflabel{$e^-$}{i1} %Labels one of the left sources
\fmflabel{$e^-$}{o1} %Labels one of the right outputs
\fmflabel{$e^+$}{o2} %Labels one of the right outputs
\fmf{photon}{i1,v1} %Connects the sources with a vertex.
% \fmf{fermion}{i1,v1} %Connects the outputs with a vertex.
% \fmf{fermion}{v1,v2} %Labels the conneting line.
\fmf{fermion}{v1,o1}
\fmf{fermion}{v1,o2}
\end{fmfgraph*}
}
\end{fmffile}\caption{Feynman Diagram}
\end{figure}
\end{exe}
\end{document}
一旦我运行此代码，*.mp就会生成一个文件。我运行 metapost，然后再次运行 LaTeX。问题是没有生成 feynman，我得到了*.txt一个
This is MetaPost, Version 1.005 (MiKTeX 2.8) (preloaded mem=mpost 2013.3.11) 11 MAR 2013 16:56
**C:\Users\thanos\Documents\^^d6^^d4^^c5\2nd Semester\Elementary Particle Physi
cs\Homework\testMF\pair.mp
! Emergency stop.
<*> C:\Users\thanos\Documents\^^d6^^d4^^c5\2nd
Semester\Elementary Particle ...
*** (job aborted, file error in nonstop mode)
我曾经使用相同的程序来创建此类图表，并且一切都运行正常。您知道这是怎么回事吗？