服从正态分布

Question

我有一个使用 tikz 的正态分布函数，我无法填充曲线下的区域。

这是我的最小代码：

    \documentclass[margin=10pt]{standalone}
    \usepackage{tikz}

    \begin{document}
      \tikzset{declare function={myGauss(\x,\y,\z)=exp(-(\x-\y)*(\x-\y)/(\z*\z));}}
      % this is a Gaussian centered at \y with a width controlled by \z
      \begin{tikzpicture}
        \draw [thick] (0,0)--(5,0);
        \foreach \x in {0,...,5}
          \draw[xshift=\x cm, thick] (0pt,-1pt)--(0pt,1pt) node[below] {$\x$};
          \draw plot[fill=red,domain=0:5,variable=\x,samples=100] ({\x},{myGauss(\x,4.24,0.43)});
      \end{tikzpicture}\par
    \end{document}

我想在正态分布曲线下创建一个实心填充，但一直没有成功。任何帮助都将不胜感激。谢谢。

Answer 1

\documentclass[tikz,margin=10pt]{standalone}
\begin{document}
\tikzset{declare function={myGauss(\x,\y,\z)=exp(-(\x-\y)*(\x-\y)/(\z*\z));}}
% this is a Gaussian centered at \y with a width controlled by \z
    \begin{tikzpicture}
        \def\mygaussian{plot[domain=0:5,variable=\x,samples=100] ({\x},{myGauss(\x,4.24,0.43)})}
        \fill[cyan] (0,0)  \mygaussian -- (5,0) -- cycle ;
        \draw \mygaussian;
        
        \draw [thick] (0,0)--(5,0);
        \foreach \x in {0,...,5}
        \draw[xshift=\x cm, thick] (0pt,-1pt)--(0pt,1pt) node[below] {$\x$};
        
    \end{tikzpicture}
\end{document}