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如何使用更少的标记同时保留曲线细节？

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如何使用更少的标记同时保留曲线细节？

我正在尝试向具有许多点的曲线添加一些标记，如下所示，但不诉诸第二个添加图：

\documentclass{article}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\begin{axis}
  \addplot[color=red,no markers] coordinates {
    (2,-1.8559703)
    (2.5,-2.8559703)
    (3,-3.5301677)
    (3.5,-4.01677)
    (4,-4.3050655)
    (4.5,-4.813136)
    (5,-5.1413136)
    (5.5,-5.7322865)
    (6,-6.0322865)
    (6.5,-6.675052)
    (7,-6.9675052)
    (7.5,-7.975052)
    (8,-8.9377747)
  };
  \addplot[color=red, only marks] coordinates {
    (2,-1.8559703)
    (4,-4.3050655)
    (6,-6.0322865)
    (8,-8.9377747)
  };
\end{axis}
\end{tikzpicture}
\end{document}

答案1

您有多个键可以控制应绘制哪些标记：

  1. 您可以使用mark repeat=<number>；这允许仅绘制每个nth标记，其中n提供的值为<number>。

  2. mark phase=<number>；使用后添加此项mark repeat来控制标记的起点。

  3. 还有mark indices={<index list>}；使用它来指定应该绘制的标记的索引列表。

显示这些键实际作用的完整示例（第一个示例给出了您在问题中请求的标记模式）：

\documentclass{article}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\begin{axis}
  \addplot+[color=red,mark repeat=4] coordinates {
    (2,-1.8559703)
    (2.5,-2.8559703)
    (3,-3.5301677)
    (3.5,-4.01677)
    (4,-4.3050655)
    (4.5,-4.813136)
    (5,-5.1413136)
    (5.5,-5.7322865)
    (6,-6.0322865)
    (6.5,-6.675052)
    (7,-6.9675052)
    (7.5,-7.975052)
    (8,-8.9377747)
  };
\end{axis}
\end{tikzpicture}

\begin{tikzpicture}
\begin{axis}
  \addplot+[color=red,mark repeat=3,mark phase=2] coordinates {
    (2,-1.8559703)
    (2.5,-2.8559703)
    (3,-3.5301677)
    (3.5,-4.01677)
    (4,-4.3050655)
    (4.5,-4.813136)
    (5,-5.1413136)
    (5.5,-5.7322865)
    (6,-6.0322865)
    (6.5,-6.675052)
    (7,-6.9675052)
    (7.5,-7.975052)
    (8,-8.9377747)
  };
\end{axis}
\end{tikzpicture}

\begin{tikzpicture}
\begin{axis}
  \addplot+[color=red,mark indices={1,5,9}] coordinates {
    (2,-1.8559703)
    (2.5,-2.8559703)
    (3,-3.5301677)
    (3.5,-4.01677)
    (4,-4.3050655)
    (4.5,-4.813136)
    (5,-5.1413136)
    (5.5,-5.7322865)
    (6,-6.0322865)
    (6.5,-6.675052)
    (7,-6.9675052)
    (7.5,-7.975052)
    (8,-8.9377747)
  };
\end{axis}
\end{tikzpicture}

\end{document}

在此处输入图片描述

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