我有一张使用 matlab2tikz 从 Matlab 转换的 tikz 图片。我尝试使用 tikz 外部化功能，因为我有许多图要编译到较大的文档中。
当我编译下面的内容时，tikz 图片没有出现在 PDF 中。没有显示任何错误，并且进程正常退出。我在 Windows 操作系统上使用 Texmaker 和 MiKTeX。
\documentclass[12pt,a4paper]{report}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\usetikzlibrary{plotmarks}
\usetikzlibrary{arrows.meta}
\usepgfplotslibrary{patchplots}
\usepackage{grffile}
\usepackage{amsmath}
\newlength\fwidth
\newlength\fheight
\usepgfplotslibrary{external}
\usetikzlibrary{external}
\tikzexternalize
\begin{document}
\begin{figure}
\centering
\setlength\fwidth{0.9\textwidth}
\setlength\fheight{250pt}
\input{data1.tex}
\end{figure}
\end{document}
tikz 图片 'data1.tex' 是
% This file was created by matlab2tikz.
%
%The latest updates can be retrieved from
% http://www.mathworks.com/matlabcentral/fileexchange/22022-matlab2tikz-matlab2tikz
%where you can also make suggestions and rate matlab2tikz.
%
\definecolor{mycolor1}{rgb}{0.13333,0.28235,0.43922}%
%
\begin{tikzpicture}
\begin{axis}[%
width=0.951\fwidth,
height=\fheight,
at={(0\fwidth,0\fheight)},
scale only axis,
xmin=0,
xmax=1.2,
xtick={\empty},
ymin=3500,
ymax=4500,
ytick={\empty},
axis background/.style={fill=white}
]
\end{axis}
\begin{axis}[%
width=0.951\fwidth,
height=\fheight,
at={(0\fwidth,0\fheight)},
scale only axis,
xmin=0,
xmax=1.2,
xminorticks=true,
tick align=outside,
xlabel style={font=\color{white!15!black}},
xlabel={Time (s)},
ymin=3500,
ymax=4500,
yminorticks=true,
ylabel style={font=\color{white!15!black}},
ylabel={Load (N)},
axis x line*=bottom,
axis y line*=left
]
\addplot [color=mycolor1, line width=0.2pt, forget plot]
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1.19499999999971 3873.952065096\\
1.19750000000022 3885.918999472\\
1.19999999999982 3901.269724\\
};
\end{axis}
\end{tikzpicture}%
我的 PdfLaTeX 构建命令是：
pdflatex -synctex=1 -interaction=nonstopmode --shell-escape %.tex
如果我禁用外部化，则情节将按预期出现。
为什么使用 externalize 时绘图没有出现在 PDF 中？