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pgfplots 中的循环不起作用

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pgfplots 中的循环不起作用

我尝试循环pgfplots绘制曲线下方的矩形，但不起作用。这是我的代码

\begin{tikzpicture}\begin{axis}[   
    width=160pt,compat=1.5.1,grid style={ultra thin},  
    x tick label style={font=\tiny},y tick label style={font=\tiny},  
    scale only axis,grid=major,axis lines=middle,  
    xlabel={$x$},  
    ylabel={$y$},  
    xmin=-0.13,  
    xmax=1.6,  
    domain=-0.25:2,  
    ymin=-0.3,  
    ymax=3.3,  
    xtick={0,0.25,...,1.5}, xticklabels={,,0.5,,1,,1.5},  
    ytick={0,0.5,...,3},  
    legend style={at={(0.5,-0.05)},anchor=north,nodes={right}},  
    extra tick style={tickwidth=2pt},  
        extra x ticks={1.1},  
       extra x tick labels={$ 1.1 $},  
]  

\addplot [red,thick,samples=200] { sin(deg(x^2)) };  
\addlegendentry{$ g(x)=\sin\left(x^2\right) $}

\foreach \n [evaluate={\y=sin(deg((\n+0.05)^2))}] in {0,0.05,...,1}  
\draw (axis cs: \n, 0) rectangle (axis cs: \n+0.05, \y);  
\end{axis}
\end{tikzpicture}

我做错了什么？

答案1

tikz我无法解释为什么你的代码无法编译，因为对和了解不够（或者说根本不了解）pgfplots。但是这个变体有效

\documentclass[tikz,border=12pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.9}
\begin{document}
\begin{tikzpicture}[domain=-0.1:1.1]
\begin{axis}[   
    width=160pt,compat=1.5.1,grid style={ultra thin},  
    x tick label style={font=\tiny},y tick label style={font=\tiny},  
    scale only axis,grid=major,axis lines=middle,  
    xlabel={$x$},  
    ylabel={$y$},  
    xmin=-0.13,  
    xmax=1.6,  
    domain=-0.25:2,  
    ymin=-0.3,  
    ymax=3.3,  
    xtick={0,0.25,...,1.5}, xticklabels={,,0.5,,1,,1.5},  
    ytick={0,0.5,...,3},  
    legend style={at={(0.5,-0.05)},anchor=north,nodes={right}},  
    extra tick style={tickwidth=2pt},  
        extra x ticks={1.1},  
       extra x tick labels={$ 1.1 $},  
]  

\addplot [red,thick,samples=200] { sin(deg(x^2)) };  
\addlegendentry{$ g(x)=\sin\left(x^2\right) $}

  \foreach \n [evaluate={\y=sin(deg((\n+0.05)^2))}] in {0,0.05,...,1}
    {%
    \edef\x {\noexpand \draw (axis cs: \n, 0) rectangle (axis cs: \n+0.05, \y)}%
    \x;
    }
\end{axis}
\end{tikzpicture}
\end{document}

带有 foreach 的 pgfplots

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