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Tikz：函数和节点的位置

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Tikz：函数和节点的位置

使用以下代码，我可以创建三个具有不同均值的正态分布。虽然图表看起来不错，但我在将节点放置在正确的坐标上时遇到了一些问题。

很明显，图表的坐标和 A4 纸的坐标不一样。我认为这是合乎逻辑的，这样图表才能真正被创建出来。

为了放置节点，我不得不遵循反复试验的方法，直到在图表上找到正确的位置。当然，这似乎不是一个理想的解决方案。

我希望您能给我一些关于如何处理上述问题的提示。

代码：

\documentclass[hidelinks,parskip=full,12pt]{article}
\usepackage{tikz}                        
\usepackage{pgfplots}                    
\usetikzlibrary{intersections} 
\usetikzlibrary{calc}
\usetikzlibrary{positioning}

\begin{document}

\begin{center}
\newcommand\gauss[2]{1/(#2*sqrt(2*pi))*exp(-((x-#1)^2)/(2*#2^2))}
\begin{tikzpicture}
\begin{axis}[every axis plot post/.append style={
   mark=none,domain=-5:20,samples=50,smooth}, 
axis x line*=bottom, % no box around the plot, only x and y axis
axis y line*=left, % the * suppresses the arrow tips
enlargelimits=upper] % extend the axes a bit to the right and top
\addplot {\gauss{2}{2}};
\addplot {\gauss{8}{2}};
\addplot {\gauss{14}{2}};
\end{axis}

\draw (1.55, 5.6) node{$f(\theta_A, x)$};
\draw (3.50, 5.6) node{$f(\theta_B, x)$};
\draw (5.50, 5.6) node{$f(\theta_C, x)$};

\end{tikzpicture}
\end{center}

\end{document}

答案1

这里有几个选择；例如，你可以axis:cs在定义中使用node

    \node[anchor=south] at (axis cs:0,0.2) {$f(\theta_A, x)$};
    \node[anchor=south] at (axis cs:6,0.2) {$f(\theta_B, x)$};
    \node[anchor=south] at (axis cs:15,0.2) {$f(\theta_C, x)$};

这使

截屏

% arara: pdflatex
% !arara: indent: {overwrite: on}
\documentclass[tikz]{standalone}
\usepackage{pgfplots}

\begin{document}

\newcommand\gauss[2]{1/(#2*sqrt(2*pi))*exp(-((x-#1)^2)/(2*#2^2))}
\begin{tikzpicture}
    \begin{axis}[every axis plot post/.append style={
                mark=none,domain=-5:20,samples=50,smooth},
            axis x line*=bottom, % no box around the plot, only x and y axis
            axis y line*=left, % the * suppresses the arrow tips
        enlargelimits=upper] % extend the axes a bit to the right and top
        %\addplot {\gauss{2}{2}}node[pos=0.5]{$f(\theta_A, x)$};
        \addplot {\gauss{2}{2}};
        \addplot {\gauss{8}{2}};
        \addplot {\gauss{14}{2}};
        \node[anchor=south] at (axis cs:0,0.2) {$f(\theta_A, x)$};
        \node[anchor=south] at (axis cs:6,0.2) {$f(\theta_B, x)$};
        \node[anchor=south] at (axis cs:15,0.2) {$f(\theta_C, x)$};
    \end{axis}
\end{tikzpicture}

\end{document}

或者，您可以将node直接添加到addplot命令中，并指定pos和anchor，例如：

    \addplot {\gauss{2}{2}}node[pos=0.2,anchor=east]{$f(\theta_A, x)$};
        \addplot {\gauss{8}{2}}node[pos=0.1,anchor=south west]{$f(\theta_B, x)$};
        \addplot {\gauss{14}{2}}node[pos=0.9]{$f(\theta_C, x)$};

这使

截屏

您可以pos随意设置0它1

% arara: pdflatex
% !arara: indent: {overwrite: on}
\documentclass[tikz]{standalone}
\usepackage{pgfplots}

\begin{document}

\newcommand\gauss[2]{1/(#2*sqrt(2*pi))*exp(-((x-#1)^2)/(2*#2^2))}
\begin{tikzpicture}
    \begin{axis}[every axis plot post/.append style={
                mark=none,domain=-5:20,samples=50,smooth},
            axis x line*=bottom, % no box around the plot, only x and y axis
            axis y line*=left, % the * suppresses the arrow tips
        enlargelimits=upper] % extend the axes a bit to the right and top
        \addplot {\gauss{2}{2}}node[pos=0.2,anchor=east]{$f(\theta_A, x)$};
        \addplot {\gauss{8}{2}}node[pos=0.1,anchor=south west]{$f(\theta_B, x)$};
        \addplot {\gauss{14}{2}}node[pos=0.9]{$f(\theta_C, x)$};
    \end{axis}
\end{tikzpicture}

\end{document}

答案2

您可以将nodes 放在环境中axis并使用axis cs（轴坐标系）。然后您可以放置

\node at (axis cs:1.6,0.21) {$f(\theta_A, x)$};

您在轴上看到的坐标。

代码：

\documentclass[hidelinks,parskip=full,12pt]{article}
\usepackage{tikz}
\usepackage{pgfplots}
\usetikzlibrary{intersections}
\usetikzlibrary{calc}
\usetikzlibrary{positioning}

\begin{document}

\begin{center}
\newcommand\gauss[2]{1/(#2*sqrt(2*pi))*exp(-((x-#1)^2)/(2*#2^2))}
\begin{tikzpicture}
\begin{axis}[every axis plot post/.append style={
   mark=none,domain=-5:20,samples=50,smooth},
axis x line*=bottom, % no box around the plot, only x and y axis
axis y line*=left, % the * suppresses the arrow tips
enlargelimits=upper] % extend the axes a bit to the right and top
\addplot {\gauss{2}{2}};
\addplot {\gauss{8}{2}};
\addplot {\gauss{14}{2}};
\node at (axis cs:1.6,0.21){$f(\theta_A, x)$};
\node at (axis cs:7.5,0.21){$f(\theta_B, x)$};
\node at (axis cs:14,0.21){$f(\theta_C, x)$};
\end{axis}
\end{tikzpicture}
\end{center}

\end{document}

在此处输入图片描述

还有rel axis cs一种系统，左下角是(0,0)，右上角是(1,1)

\documentclass[hidelinks,parskip=full,12pt]{article}
\usepackage{tikz}
\usepackage{pgfplots}
\usetikzlibrary{intersections}
\usetikzlibrary{calc}
\usetikzlibrary{positioning}

\begin{document}

\begin{center}
\newcommand\gauss[2]{1/(#2*sqrt(2*pi))*exp(-((x-#1)^2)/(2*#2^2))}
\begin{tikzpicture}
\begin{axis}[every axis plot post/.append style={
   mark=none,domain=-5:33,samples=50,smooth},
axis x line*=bottom, % no box around the plot, only x and y axis
axis y line*=left, % the * suppresses the arrow tips
enlargelimits=upper,width=5in] % extend the axes a bit to the right and top
\addplot {\gauss{2}{2}};
\addplot {\gauss{14}{2}};
\addplot {\gauss{25}{2}};
\node at (rel axis cs:0.17,0.95){$f(\theta_A, x)$};
\node at (rel axis cs:0.46,0.95){$f(\theta_B, x)$};
\node at (rel axis cs:0.71,0.95){$f(\theta_C, x)$};
\end{axis}
\end{tikzpicture}
\end{center}

\end{document}

在此处输入图片描述

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