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使用 \addplot 命令确定显示的节点类型

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使用 \addplot 命令确定显示的节点类型

我有一个有理函数图。我用\addplots它来绘制一个点。 TikZ用菱形标记该点。我想用一个点来标记它。如何指定选项以使点的颜色相同blue或不同？如何指定大小？点的默认大小是 1.5pt 吗？

\documentclass{amsart}
\usepackage{tikz}
\usetikzlibrary{calc}

\usepackage{pgfplots}
\pgfplotsset{compat=newest}

\begin{document}

\begin{tikzpicture}
\begin{axis}[width=6in,axis equal image,clip=false,
    axis lines=middle,
    xmin=-42.5,xmax=42.5,
    samples=201,
    xlabel=$x$,ylabel=$y$,
    ymin=-42.5,ymax=42.5,
    restrict y to domain=-42.5:42.5,
    xtick={},ytick={},
    ticklabel style={font=\tiny,fill=white},
    enlargelimits={abs=0.25cm},
    axis line style={latex-latex},
    xlabel style={at={(ticklabel* cs:1)},anchor=north west},
    ylabel style={at={(ticklabel* cs:1)},anchor=south west}
]
\addplot[samples=501,domain=-40:64/41,blue] {(x + 16)/(x - 2)};
\addplot[samples=501,domain=32/13:40,blue] {(x + 16)/(x - 2)} node[above,pos=0.9,font=\footnotesize]{$y=\frac{x+16}{x-2}$};

\addplot[dashed, latex-latex, samples=2, domain=-42.5:42.5] {1} node[above,pos=0.1,font=\footnotesize]{$y=1$};
\addplot [dashed, latex-latex, samples=2, domain=-42.5:42.5] (2,x) node [pos=0.1, anchor=north, font=\footnotesize, sloped] {$x=2$};

\addplot coordinates{(5,7)} node[anchor=west,font=\footnotesize]{$(5,7)$};
\end{axis}
\end{tikzpicture}

\end{document}

答案1

添加[mark=*,blue,mark size=2pt]到绘图坐标中，其中mark=*构成一个小球，blue是颜色，mark size=2pt是尺寸。

输出

图1

代码

\documentclass{amsart}
\usepackage{tikz}
\usetikzlibrary{calc}

\usepackage{pgfplots}
\pgfplotsset{compat=newest}

\begin{document}

\begin{tikzpicture}
\begin{axis}[width=6in,axis equal image,clip=false,
    axis lines=middle,
    xmin=-42.5,xmax=42.5,
    samples=201,
    xlabel=$x$,ylabel=$y$,
    ymin=-42.5,ymax=42.5,
    restrict y to domain=-42.5:42.5,
    xtick={},ytick={},
    ticklabel style={font=\tiny,fill=white},
    enlargelimits={abs=0.25cm},
    axis line style={latex-latex},
    xlabel style={at={(ticklabel* cs:1)},anchor=north west},
    ylabel style={at={(ticklabel* cs:1)},anchor=south west}
]
\addplot[samples=501,domain=-40:64/41,blue] {(x + 16)/(x - 2)};
\addplot[samples=501,domain=32/13:40,blue] {(x + 16)/(x - 2)} node[above,pos=0.9,font=\footnotesize]{$y=\frac{x+16}{x-2}$};

\addplot[dashed, latex-latex, samples=2, domain=-42.5:42.5] {1} node[above,pos=0.1,font=\footnotesize]{$y=1$};
\addplot [dashed, latex-latex, samples=2, domain=-42.5:42.5] (2,x) node [pos=0.1, anchor=north, font=\footnotesize, sloped] {$x=2$};

\addplot[mark=*,blue,mark size=2pt] coordinates{(5,7)} node[anchor=west,font=\footnotesize]{$(5,7)$};
\end{axis}
\end{tikzpicture}
\end{document}

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