为轴线添加提示

为轴线添加提示

我正在尝试添加指向下图轴线的箭头:

\documentclass{article}
\usepackage{xcolor}
\usepackage{pgfplots}
\usepackage{amsmath}

\begin{document}

\begin{figure}[ht]

\centering

\begin{tikzpicture}[scale=1.75,line width=1pt]
\begin{axis}[
color= gray,
xmin=-4.9, 
xmax=4.9, 
ymin=-1.9, 
ymax=2.9, 
axis equal image, 
axis lines=middle, 
font=\scriptsize,
xtick distance=1,
ytick distance=1,
xticklabels={}, 
yticklabels={},
legend pos=outer north east,
]

\addplot[red, smooth, domain=-4.9:4.9] {(8)/(4 + x^2)}; 
\addlegendentry{$f(x)$}

\addplot[blue, smooth, domain=-4.9:4.9]{(-16*x)/((4+x^2)^2)};
\addlegendentry{$f'(x)$}

\addplot[green, smooth, domain=-4.9:4.9]{-(((16)*((4 + x^2)^2))-((4 + x^2)* 
(64*(x^2))))/((4+x^2)^4)};
\addlegendentry{$f''(x)$}


\end{axis}
\end{tikzpicture}

\caption{Plotting the curve when $r=1$.}
\label{fig:1}

\end{figure}

\end{document}

以下是代码的输出:

轴

看到只有轴线的顶部和右端有箭头指针,而底部和左端没有吗?有没有办法让我在四个端点都得到一些箭头指针?

谢谢!

答案1

添加

every inner x axis line/.append style={stealth-stealth},
every inner y axis line/.append style={stealth-stealth},

在轴选项的末尾,就在之后legend pos=outer north east,和之前]

请参阅现行参考手册

如果您对它们相同感到满意,那么您可以只设置一个键(如评论中指出的那样):

inner axis line style={stealth-stealth}

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