将 geogebra 的 pgf/tikz 图形导出到 latex 时出现问题

Question

最快的解决方法是添加\pgfplotsset{compat=1.11}到序言中。

默认情况下，正常 TikZ 绘图宏的坐标\draw如下不是在环境中使用时，对应于轴单位。但是，axis从的兼容性设置开始，默认设置会发生变化，因此坐标确实对应于轴坐标，而不是底层的坐标。（我认为这至少是原因，尽管我并不完全确定。）1.11pgfplotstikzpicture

话虽如此，我个人宁愿改变代码以使用\addplot宏pgfplots而不是\draw plot，即

\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45]
\begin{axis}[
axis lines=middle,
ymajorgrids=true,
xmajorgrids=true,
xmin=-3.9999999999999982,
xmax=3.979999999999998,
ymin=-2.9800000000000013,
ymax=2.9800000000000013,
xtick={-3.0,-2.0,...,3.0},
ytick={-2.0,-1.0,...,2.0}
]

\addplot [line width=0.8pt,smooth,samples=100,domain=6.920000002293365E-6:0.9999961013223213] (\x,{sqrt(((\x)*((\x)-1.0)*((\x)-2.0))/6.0)});
\addplot [line width=0.8pt,smooth,samples=100,domain=2.000002653901591:3.979999999999998] (\x,{sqrt(((\x)*((\x)-1.0)*((\x)-2.0))/6.0)});
\addplot [line width=0.8pt,smooth,samples=100,domain=6.920000002293365E-6:0.9999961013223213] (\x,{0-sqrt(((\x)*((\x)-1.0)*((\x)-2.0))/6.0)});
\addplot[line width=0.8pt,smooth,samples=100,domain=2.000002653901591:3.979999999999998] (\x,{0-sqrt(((\x)*((\x)-1.0)*((\x)-2.0))/6.0)});
\end{axis}
\end{tikzpicture}

顺便说一句，\usepackage{pgf,tikz,pgfplots}有点冗余，pgfplots加载tikz，加载pgf，所以你真正需要的只需要\usepackage{pgfplots}。

完整示例和输出：

\documentclass[10pt]{article}
\usepackage{pgfplots}

\usetikzlibrary{arrows}
\pagestyle{empty}
\begin{document}
Modified code:

\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45]
\begin{axis}[
axis lines=middle,
ymajorgrids=true,
xmajorgrids=true,
xmin=-3.9999999999999982,
xmax=3.979999999999998,
ymin=-2.9800000000000013,
ymax=2.9800000000000013,
xtick={-3.0,-2.0,...,3.0},
ytick={-2.0,-1.0,...,2.0}
]

\addplot [line width=0.8pt,smooth,samples=100,domain=6.920000002293365E-6:0.9999961013223213] (\x,{sqrt(((\x)*((\x)-1.0)*((\x)-2.0))/6.0)});
\addplot [line width=0.8pt,smooth,samples=100,domain=2.000002653901591:3.979999999999998] (\x,{sqrt(((\x)*((\x)-1.0)*((\x)-2.0))/6.0)});
\addplot [line width=0.8pt,smooth,samples=100,domain=6.920000002293365E-6:0.9999961013223213] (\x,{0-sqrt(((\x)*((\x)-1.0)*((\x)-2.0))/6.0)});
\addplot[line width=0.8pt,smooth,samples=100,domain=2.000002653901591:3.979999999999998] (\x,{0-sqrt(((\x)*((\x)-1.0)*((\x)-2.0))/6.0)});
\end{axis}
\end{tikzpicture}

With \texttt{compat=1.11}:

% in general you want this line in the preamble, I added it here just for the sake
% of the example, to show that the above code works without it
\pgfplotsset{compat=1.11}
\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1.0cm,y=1.0cm]
\begin{axis}[
x=1.0cm,y=1.0cm,
axis lines=middle,
ymajorgrids=true,
xmajorgrids=true,
xmin=-3.9999999999999982,
xmax=3.979999999999998,
ymin=-2.9800000000000013,
ymax=2.9800000000000013,
xtick={-3.0,-2.0,...,3.0},
ytick={-2.0,-1.0,...,2.0},]
\clip(-4.,-2.98) rectangle (3.98,2.98);
\draw[line width=0.8pt,smooth,samples=100,domain=6.920000002293365E-6:0.9999961013223213] plot(\x,{sqrt(((\x)*((\x)-1.0)*((\x)-2.0))/6.0)});
\draw[line width=0.8pt,smooth,samples=100,domain=2.000002653901591:3.979999999999998] plot(\x,{sqrt(((\x)*((\x)-1.0)*((\x)-2.0))/6.0)});
\draw[line width=0.8pt,smooth,samples=100,domain=6.920000002293365E-6:0.9999961013223213] plot(\x,{0-sqrt(((\x)*((\x)-1.0)*((\x)-2.0))/6.0)});
\draw[line width=0.8pt,smooth,samples=100,domain=2.000002653901591:3.979999999999998] plot(\x,{0-sqrt(((\x)*((\x)-1.0)*((\x)-2.0))/6.0)});
\end{axis}
\end{tikzpicture}

\end{document}

Answer 1