考虑以下代码
\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\begin{document}
\begin{figure}[h]
\centering
\begin{tikzpicture}
\begin{axis}[
scale only axis,
xmin=-3.200,
xmax=3.200,
ymin=-3.200,
ymax=3.200,
xmajorgrids,
ymajorgrids]
\addplot[contour prepared, contour prepared format=matlab, line width=1.4pt] table[row sep=crcr] {
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};
\end{axis}
\end{tikzpicture}
\end{figure}
\end{document}
我曾经matlab2tikz生成过这个图（经过了一些修改）。这是我得到的结果
如何判断pgfplots或tikz限制每条轮廓线仅一个轮廓标签（最好靠近线的中心）？
答案1
你可以玩contour/label distance = x pt，例如
\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\begin{document}
\begin{figure}[h]
\centering
\begin{tikzpicture}
\begin{axis}[
scale only axis,
xmin=-3.200,
xmax=3.200,
ymin=-3.200,
ymax=3.200,
xmajorgrids,
contour/label distance=160pt,
ymajorgrids]
\addplot[contour prepared, contour prepared format=matlab, line width=1.4pt] table[row sep=crcr] {
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3.006 -2.880\\
3.002 -2.877\\
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2.712 -2.618\\
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2.618 -2.535\\
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};
\end{axis}
\end{tikzpicture}
\end{figure}
\end{document}
要得到：
距离越小，标记越密集。