使用 pgfplots 对图中的一组点进行支撑不足

Question

我在同一张图中绘制了两组点。我想用大括号标记它们分组，用大括号标记欠焊或过焊，正如我在此处手工说明的那样：

我正在寻找与数学格式相同类型的钎焊，其中 $$\underbrace{a+b+c}_n$$：

A测试工作代码是：

\documentclass{article}

\usepackage{pgfplots}
\usepackage{xcolor}

\begin{document}


\begin{tikzpicture}
\pgfplotsset{height=7cm, width=8.5cm}

\begin{axis}[
    axis lines = left,
    hide x axis,
    xmin=0, xmax=8,
    ymin=600,ymax=1000
]
\addplot[only marks,orange] coordinates {
    (1,700)
    (2,700)
    (3,700)
    (4,700)
    (5,700)
};
\end{axis}

\begin{axis}[
    hide x axis,
    hide y axis,
    ymin=600,ymax=1000,
    xmin=0, xmax=8
]
\addplot[only marks,blue] coordinates {
    (6,900)
    (7,900)
};
\node at (axis cs:1, 725) {1};
\node at (axis cs:2, 725) {2};
\node at (axis cs:3, 725) {3};
\node at (axis cs:4, 725) {4};
\node at (axis cs:5, 725) {5};
\node at (axis cs:6, 925) {6};
\node at (axis cs:7, 925) {7};

\end{axis}
\end{tikzpicture}

\end{document}

Answer 1

您可以使用它在两点之间decorations={brace}创建一个支架。tikz

我用 等定义了所需的节点A，B以便重复使用这些位置。

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}

\usepackage{pgfplots}
\usepackage{xcolor}

\begin{document}


\begin{tikzpicture}
\pgfplotsset{height=7cm, width=8.5cm}

\begin{axis}[
    axis lines = left,
    hide x axis,
    xmin=0, xmax=8,
    ymin=600,ymax=1000
]
\addplot[only marks,orange] coordinates {
    (1,700)
    (2,700)
    (3,700)
    (4,700)
    (5,700)
};
\end{axis}

\begin{axis}[
    hide x axis,
    hide y axis,
    ymin=600,ymax=1000,
    xmin=0, xmax=8
]
\addplot[only marks,blue] coordinates {
    (6,900)
    (7,900)
};
\node (A) at (axis cs:1, 725) {1};
\node at (axis cs:2, 725) {2};
\node at (axis cs:3, 725) {3};
\node at (axis cs:4, 725) {4};
\node (B) at (axis cs:5, 725) {5};
\node (C) at (axis cs:6, 925) {6};
\node (D) at (axis cs:7, 925) {7};

\draw [decorate,decoration={brace,amplitude=10pt,mirror,raise=6mm}]
(A.west) -- (B.east) node [black,midway, below, yshift=-10mm] {a};

\draw [decorate,decoration={brace,amplitude=5pt,mirror,raise=6mm}]
(C.west) -- (D.east) node [black,midway, below, yshift=-10mm] {b};

\end{axis}
\end{tikzpicture}

\end{document}