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为多项选择题添加一些 tikz 图形的字幕

tag-icon • tag-icon tikz-pgf captions
为多项选择题添加一些 tikz 图形的字幕

我想创建一个包含可能选项的问题。每个选项将是一个 tikz 图形。我如何插入标题以使其看起来像

(A) (B)
(C) (D)

直接位于每个数字下方？

La d\'{e}riv\'{e}e d'une fonction est $f'(x) = (x+1)(x-3)$.  
Lequel des \'{e}l\'{e}ments suivants pourrait \^{e}tre un croquis de la fonction?

\begin{tikzpicture}
\begin{axis}[
  ticks=none, axis x line=middle, axis y line=middle,
  ymin=-20, ymax=15, ylabel=$y$,
  xmin=-4, xmax=4, xlabel=$x$,
]

\addplot[samples=40,domain=-4:4,thick] {(1/3)*x^3-x^2-3*x+10};
\draw[dashed] (-1,15) -- (-1,-14) node[below]{$x=-1$}  ;
\draw[dashed] (3,15) -- (3,-14) node[below]{$x=3$};
\end{axis}
\end{tikzpicture}
\qquad
\begin{tikzpicture}
\begin{axis}[
  ticks=none, axis x line=middle, axis y line=middle,
  ymin=-20, ymax=15, ylabel=$y$,
  xmin=-4, xmax=4, xlabel=$x$,
]

\addplot[samples=40,domain=-4:4,thick] {-(1/3)*x^3+x^2+3*x};
\draw[dashed] (-1,15) -- (-1,-14) node[below]{$x=-1$}  ;
\draw[dashed] (3,15) -- (3,-14) node[below]{$x=3$};
\end{axis}
\end{tikzpicture}

\begin{tikzpicture}
\begin{axis}[
  ticks=none, axis x line=middle, axis y line=middle,
  ymin=-20, ymax=15, ylabel=$y$,
  xmin=-4, xmax=4, xlabel=$x$,
]

\addplot[samples=40,domain=-4:4,thick] {(1/3)*x^3+x^2+3*x};
\draw[dashed] (-1,15) -- (-1,-14) node[below]{$x=-1$}  ;
\draw[dashed] (3,15) -- (3,-14) node[below]{$x=3$};
\end{axis}
\end{tikzpicture}
\qquad
\begin{tikzpicture}
\begin{axis}[
  ticks=none, axis x line=middle, axis y line=middle,
  ymin=-20, ymax=15, ylabel=$y$,
  xmin=-4, xmax=4, xlabel=$x$,
]

\addplot[samples=40,domain=-4:4,thick] {(2/3)*x^3-0.7*x^2-4*x};
\draw[dashed] (-1,15) -- (-1,-14) node[below]{$x=-1$}  ;
\draw[dashed] (3,15) -- (3,-14) node[below]{$x=3$};
\end{axis}
\end{tikzpicture}

答案1

您可以使用类似这样的包subcaption来创建子图，但您也可以像本例一样node在底部添加一个tikzpicture。如果您希望轴和标签之间留出更多空间，请将修改newcommand为例如，below=3mm而不仅仅是below。

在此处输入图片描述

\documentclass{article}    
\usepackage{pgfplots}
\pgfplotsset{compat=1.14,width=6cm}
\newcommand\tikzsublabel[1]{\node [below] at (current bounding box.south) {(#1)};}
\begin{document}

La d\'{e}riv\'{e}e d'une fonction est $f'(x) = (x+1)(x-3)$.  
Lequel des \'{e}l\'{e}ments suivants pourrait \^{e}tre un croquis de la fonction?
\begin{center}
\begin{tikzpicture}
\begin{axis}[
  ticks=none, axis x line=middle, axis y line=middle,
  ymin=-20, ymax=15, ylabel=$y$,
  xmin=-4, xmax=4, xlabel=$x$,
]

\addplot[samples=40,domain=-4:4,thick] {(1/3)*x^3-x^2-3*x+10};
\draw[dashed] (-1,15) -- (-1,-14) node[below]{$x=-1$}  ;
\draw[dashed] (3,15) -- (3,-14) node[below]{$x=3$};
\end{axis}
\tikzsublabel{A}
\end{tikzpicture}
\qquad
\begin{tikzpicture}
\begin{axis}[
  ticks=none, axis x line=middle, axis y line=middle,
  ymin=-20, ymax=15, ylabel=$y$,
  xmin=-4, xmax=4, xlabel=$x$,
]

\addplot[samples=40,domain=-4:4,thick] {-(1/3)*x^3+x^2+3*x};
\draw[dashed] (-1,15) -- (-1,-14) node[below]{$x=-1$}  ;
\draw[dashed] (3,15) -- (3,-14) node[below]{$x=3$};
\end{axis}
\tikzsublabel{B}
\end{tikzpicture}

\begin{tikzpicture}
\begin{axis}[
  ticks=none, axis x line=middle, axis y line=middle,
  ymin=-20, ymax=15, ylabel=$y$,
  xmin=-4, xmax=4, xlabel=$x$,
]

\addplot[samples=40,domain=-4:4,thick] {(1/3)*x^3+x^2+3*x};
\draw[dashed] (-1,15) -- (-1,-14) node[below]{$x=-1$}  ;
\draw[dashed] (3,15) -- (3,-14) node[below]{$x=3$};
\end{axis}
\tikzsublabel{C}
\end{tikzpicture}
\qquad
\begin{tikzpicture}
\begin{axis}[
  ticks=none, axis x line=middle, axis y line=middle,
  ymin=-20, ymax=15, ylabel=$y$,
  xmin=-4, xmax=4, xlabel=$x$,
]

\addplot[samples=40,domain=-4:4,thick] {(2/3)*x^3-0.7*x^2-4*x};
\draw[dashed] (-1,15) -- (-1,-14) node[below]{$x=-1$}  ;
\draw[dashed] (3,15) -- (3,-14) node[below]{$x=3$};
\end{axis}
\tikzsublabel{D}
\end{tikzpicture}
\end{center}
\end{document}

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