我使用 Matlab 生成轮廓线，并按照 pgfplots 手册中的说明将其保存到文件中。我希望将此文件加载到 pgfplots 中以绘制轮廓线，使用
\pgfplotstableread[]{contours_plant.dat} \datatable
然而，结果却是轮廓线相交的图形，如下所示：
有趣的是，当我将 contour.dat 文件的内容直接复制到 Latex 中时，并没有出现这种情况：
为了重现结果，后者的代码是：
\begin{tikzpicture}
\begin{axis}
% loading the data from the table does not seem to work:
% \pgfplotstableread[]{contours_plant.dat} \datatable
\addplot[contour prepared,
contour prepared format=matlab] table {
-5.0000000e+01 2.0000000e+00
5.9994090e+00 7.0000000e+01
6.0000000e+00 7.0003299e+01
0.0000000e+00 1.8000000e+01
5.4873383e+00 7.0000000e+01
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};%{\datatable};
\end{axis}
\end{tikzpicture}
有人能解释或解决这个问题吗？我更喜欢从文件加载数据，而不是直接将其粘贴到 Latex 中。
提前谢谢您，
雷内