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pgfplots/ymax 的问题

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pgfplots/ymax 的问题

我有两个想要连接的图形；它们都是用 pgfplots 生成的（在本例中是 gnuplot）。以下内容完全符合预期：

\documentclass{beamer}
\usepackage{graphicx}
\usepackage{pgfplots}
\pgfplotsset{compat=1.7}
\begin{document}
\begin{frame}
  \tikzstyle{every picture}+=[remember picture]
  \begin{figure}
    \centering
    \begin{tikzpicture}
      \begin{axis}[height=4cm, width=10cm, enlargelimits = false]
        \addplot gnuplot[id=1, domain=0:1] {exp(x)};
        \coordinate (upper8) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (upper6) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (lower8) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymin});
        \coordinate (lower6) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymin});
      \end{axis}
    \end{tikzpicture}
  \end{figure}
  \begin{figure}
    \centering
    \begin{tikzpicture}
      \begin{axis}[height=4cm, width=10cm, enlargelimits = false]
        \addplot gnuplot[id=2, domain=.6:.8] {exp(x)};
        \coordinate (no) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (nw) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (so) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymin});
        \coordinate (sw) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymin});
      \end{axis}
    \end{tikzpicture}
  \end{figure}
  \tikz[overlay] \draw (upper8) -- (no);
  \tikz[overlay] \draw (upper6) -- (nw);
  \tikz[overlay] \draw[dashed] (lower8) -- (so);
  \tikz[overlay] \draw[dashed] (lower6) -- (sw);
\end{frame}
\end{document}
%%% Local Variables:
%%% LaTeX-command: "latex -shell-escape"
%%% End:

LaTeX 渲染

正如已经观察到的在回答另一个问题时但是，ymax一旦（第二个）图具有对数轴，其行为就不会按预期进行：

\documentclass{beamer}
\usepackage{graphicx}
\usepackage{pgfplots}
\pgfplotsset{compat=1.7}
\begin{document}
\begin{frame}
  \tikzstyle{every picture}+=[remember picture]
  \begin{figure}
    \centering
    \begin{tikzpicture}
      \begin{axis}[height=4cm, width=10cm, enlargelimits = false]
        \addplot gnuplot[id=3, domain=0:1] {exp(x)};
        \coordinate (upper8) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (upper6) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (lower8) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymin});
        \coordinate (lower6) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymin});
      \end{axis}
    \end{tikzpicture}
  \end{figure}
  \begin{figure}
    \centering
    \begin{tikzpicture}
      \begin{axis}[height=4cm, width=10cm, enlargelimits = false, ymode=log]
        \addplot gnuplot[id=4, domain=.6:.8] {exp(x)};
        \coordinate (no) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (nw) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (so) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymin});
        \coordinate (sw) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymin});
      \end{axis}
    \end{tikzpicture}
  \end{figure}
  \tikz[overlay] \draw (upper8) -- (no);
  \tikz[overlay] \draw (upper6) -- (nw);
  \tikz[overlay] \draw[dashed] (lower8) -- (so);
  \tikz[overlay] \draw[dashed] (lower6) -- (sw);
\end{frame}
\end{document}
%%% Local Variables:
%%% LaTeX-command: "latex -shell-escape"
%%% End:

LaTeX 渲染（日志案例）

所以我的问题是：如果不行的话，我应该使用对数图做什么ymax？

顺便说一句，当我摆弄这个时，我注意到如果没有选项largelimits = false，连接线最终也会离它们应该去的地方很远；我做错了什么吗？这是代码：

\documentclass{beamer}
\usepackage{graphicx}
\usepackage{pgfplots}
\pgfplotsset{compat=1.7}
\begin{document}
\begin{frame}
  \tikzstyle{every picture}+=[remember picture]
  \begin{figure}
    \centering
    \begin{tikzpicture}
      \begin{axis}[height=4cm, width=10cm]
        \addplot gnuplot[id=5, domain=0:1] {exp(x)};
        \coordinate (upper8) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (upper6) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (lower8) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymin});
        \coordinate (lower6) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymin});
      \end{axis}
    \end{tikzpicture}
  \end{figure}
  \begin{figure}
    \centering
    \begin{tikzpicture}
      \begin{axis}[height=4cm, width=10cm]
        \addplot gnuplot[id=6, domain=.6:.8] {exp(x)};
        \coordinate (no) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (nw) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (so) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymin});
        \coordinate (sw) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymin});
      \end{axis}
    \end{tikzpicture}
  \end{figure}
  \tikz[overlay] \draw (upper8) -- (no);
  \tikz[overlay] \draw (upper6) -- (nw);
  \tikz[overlay] \draw[dashed] (lower8) -- (so);
  \tikz[overlay] \draw[dashed] (lower6) -- (sw);
\end{frame}
\end{document}
%%% Local Variables:
%%% LaTeX-command: "latex -shell-escape"
%%% End:

LaTeX 渲染（enlargelimits=true 情况）

答案1

线的偏移是由于PGFPlots 中的错误。您可以通过设置来解决此问题\pgfplotsset{cell picture=if necessary}：

\documentclass{beamer}
\usepackage{graphicx}
\usepackage{pgfplots}
\pgfplotsset{compat=1.7, cell picture=if necessary}
\begin{document}
\begin{frame}
  \tikzstyle{every picture}+=[remember picture]
  \begin{figure}
    \centering
    \begin{tikzpicture}
      \begin{axis}[height=4cm, width=10cm]
        \addplot gnuplot[id=5, domain=0:1] {exp(x)};
        \coordinate (upper8) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (upper6) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (lower8) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymin});
        \coordinate (lower6) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymin});
      \end{axis}
    \end{tikzpicture}
  \end{figure}
  \begin{figure}
    \centering
    \begin{tikzpicture}
      \begin{axis}[height=4cm, width=10cm]
        \addplot gnuplot[id=6, domain=.6:.8] {exp(x)};
        \coordinate (no) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (nw) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (so) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymin});
        \coordinate (sw) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymin});
      \end{axis}
    \end{tikzpicture}
  \end{figure}
  \tikz[overlay] \draw (upper8) -- (no);
  \tikz[overlay] \draw (upper6) -- (nw);
  \tikz[overlay] \draw[dashed] (lower8) -- (so);
  \tikz[overlay] \draw[dashed] (lower6) -- (sw);
\end{frame}
\end{document}

对于对数轴，解决方案在您链接到的答案中给出：使用交叉坐标系符号 ( \coordinate (no) at ({axis cs:0.8,0}|-{rel axis cs:0,1});)：

\documentclass{beamer}
\usepackage{graphicx}
\usepackage{pgfplots}
\pgfplotsset{compat=1.7, cell picture=if necessary}
\begin{document}
\begin{frame}
  \tikzstyle{every picture}+=[remember picture]
  \begin{figure}
    \centering
    \begin{tikzpicture}
      \begin{axis}[height=4cm, width=10cm, enlargelimits = false]
        \addplot gnuplot[id=3, domain=0:1] {exp(x)};
        \coordinate (upper8) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (upper6) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymax});
        \coordinate (lower8) at (axis cs:.8,\pgfkeysvalueof{/pgfplots/ymin});
        \coordinate (lower6) at (axis cs:.6,\pgfkeysvalueof{/pgfplots/ymin});
      \end{axis}
    \end{tikzpicture}
  \end{figure}
  \begin{figure}
    \centering
    \begin{tikzpicture}
      \begin{axis}[height=4cm, width=10cm, enlargelimits = false, ymode=log]
        \addplot gnuplot[id=4, domain=.6:.8] {exp(x)};
        \coordinate (no) at ({axis cs:0.8,0}|-{rel axis cs:0,1});
        \coordinate (nw) at ({axis cs:0.6,0}|-{rel axis cs:0,1});
        \coordinate (so) at ({axis cs:0.8,0}|-{rel axis cs:0,0});
        \coordinate (sw) at ({axis cs:0.6,0}|-{rel axis cs:0,0});
      \end{axis}
    \end{tikzpicture}
  \end{figure}
  \tikz[overlay] \draw (upper8) -- (no);
  \tikz[overlay] \draw (upper6) -- (nw);
  \tikz[overlay] \draw[dashed] (lower8) -- (so);
  \tikz[overlay] \draw[dashed] (lower6) -- (sw);
\end{frame}
\end{document}

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