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既然这些数字只需要一半的页面大小就可以表达完，为什么还要占用多页纸呢？

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既然这些数字只需要一半的页面大小就可以表达完，为什么还要占用多页纸呢？

考虑以下：

\documentclass[12pt, a4paper]{report}
\usepackage{verbatim, mathtools,amssymb, amsthm, mathrsfs}
\usepackage{graphicx}
\usepackage{tikz}
\usepackage{subcaption}


\begin{document}

\begin{figure}
\setkeys{Gin}{width=\linewidth}
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-A}%{1SAIRSI.pdf}
    \end{subfigure}

\medskip
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-B}%{1SAIRSII.pdf}
    \end{subfigure}
    \hfill
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-C}%{1SAIRSIII.pdf}
    \end{subfigure}
\caption{Plot of system (4.1)-(4.4) with $\beta_A=0.2$, $\beta_I=0.1$, $b=0.55$, $\mu=0.01$, $\nu=0.8$, $\rho=0.1$, $\xi =0.001$, $\gamma_A =0.15$, $\gamma_I=0.1$, $\sigma=0.2$, $\eta=0.7$ and $\alpha=0.01$  hence $\mathcal{R}_0 \approx 0.9265$.}
\end{figure}

\begin{figure}
\setkeys{Gin}{width=\linewidth}
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-A}%{1SAIRSI.pdf}
    \end{subfigure}

\medskip
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-B}%{1SAIRSII.pdf}
    \end{subfigure}
    \hfill
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-C}%{1SAIRSIII.pdf}
    \end{subfigure}
\caption{Plot of system (4.1)-(4.4) with $\beta_A=0.2$, $\beta_I=0.1$, $b=0.55$, $\mu=0.01$, $\nu=0.8$, $\rho=0.1$, $\xi =0.001$, $\gamma_A =0.15$, $\gamma_I=0.1$, $\sigma=0.2$, $\eta=0.7$ and $\alpha=0.01$  hence $\mathcal{R}_0 \approx 0.9265$.}
\end{figure}

\begin{figure}
\setkeys{Gin}{width=\linewidth}
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-A}%{1SAIRSI.pdf}
    \end{subfigure}

\medskip
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-B}%{1SAIRSII.pdf}
    \end{subfigure}
    \hfill
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-C}%{1SAIRSIII.pdf}
    \end{subfigure}
\caption{Plot of system (4.1)-(4.4) with $\beta_A=0.2$, $\beta_I=0.1$, $b=0.55$, $\mu=0.01$, $\nu=0.8$, $\rho=0.1$, $\xi =0.001$, $\gamma_A =0.15$, $\gamma_I=0.1$, $\sigma=0.2$, $\eta=0.7$ and $\alpha=0.01$  hence $\mathcal{R}_0 \approx 0.9265$.}
\end{figure}

\begin{figure}
\setkeys{Gin}{width=\linewidth}
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-A}%{1SAIRSI.pdf}
    \end{subfigure}

\medskip
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-B}%{1SAIRSII.pdf}
    \end{subfigure}
    \hfill
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-C}%{1SAIRSIII.pdf}
    \end{subfigure}
\caption{Plot of system (4.1)-(4.4) with $\beta_A=0.2$, $\beta_I=0.1$, $b=0.55$, $\mu=0.01$, $\nu=0.8$, $\rho=0.1$, $\xi =0.001$, $\gamma_A =0.15$, $\gamma_I=0.1$, $\sigma=0.2$, $\eta=0.7$ and $\alpha=0.01$  hence $\mathcal{R}_0 \approx 0.9265$.}
\end{figure}
\begin{figure}
\setkeys{Gin}{width=\linewidth}
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-A}%{1SAIRSI.pdf}
    \end{subfigure}

\medskip
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-B}%{1SAIRSII.pdf}
    \end{subfigure}
    \hfill
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-C}%{1SAIRSIII.pdf}
    \end{subfigure}
\caption{Plot of system (4.1)-(4.4) with $\beta_A=0.2$, $\beta_I=0.1$, $b=0.55$, $\mu=0.01$, $\nu=0.8$, $\rho=0.1$, $\xi =0.001$, $\gamma_A =0.15$, $\gamma_I=0.1$, $\sigma=0.2$, $\eta=0.7$ and $\alpha=0.01$  hence $\mathcal{R}_0 \approx 0.9265$.}
\end{figure}
\begin{figure}
\setkeys{Gin}{width=\linewidth}
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-A}%{1SAIRSI.pdf}
    \end{subfigure}

\medskip
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-B}%{1SAIRSII.pdf}
    \end{subfigure}
    \hfill
    \begin{subfigure}[h]{0.475\linewidth}
    \includegraphics{example-image-C}%{1SAIRSIII.pdf}
    \end{subfigure}
\caption{Plot of system (4.1)-(4.4) with $\beta_A=0.2$, $\beta_I=0.1$, $b=0.55$, $\mu=0.01$, $\nu=0.8$, $\rho=0.1$, $\xi =0.001$, $\gamma_A =0.15$, $\gamma_I=0.1$, $\sigma=0.2$, $\eta=0.7$ and $\alpha=0.01$  hence $\mathcal{R}_0 \approx 0.9265$.}
\end{figure}

\end{document}

为什么这些图占用了六页，而通过目测，我们可以在一页上放两张图？

答案1

这是每页容纳两幅图的一种方法。

注意，如果浮点数已被接受为 [htb]，则在下一个数字到达时不会将其转换为 [p]。只有当两者都在页面开头的队列中时，或者 时，才会发生这种情况\clearpage。

\documentclass[12pt, a4paper]{report}
\usepackage{verbatim, mathtools,amssymb, amsthm, mathrsfs}
\usepackage{graphicx}
\usepackage{tikz}
\usepackage{subcaption}
    
\begin{document}
\begin{figure}[p]
\setkeys{Gin}{width=\linewidth}
    \begin{subfigure}{0.475\linewidth}
    \includegraphics{example-image-a}%{1SAIRSI.pdf}
    \end{subfigure}\hfill
    \begin{subfigure}{0.475\linewidth}
    \includegraphics{example-image-b}%{1SAIRSII.pdf}
    \end{subfigure}
    
    \medskip
    \begin{subfigure}[c]{0.475\linewidth}% default is [b]
    \includegraphics{example-image-c}%{1SAIRSIII.pdf}
    \end{subfigure}\hfill
    \begin{minipage}{0.475\linewidth}
    \caption{Plot of system (4.1)-(4.4) with $\beta_A=0.2$, $\beta_I=0.1$, $b=0.55$, $\mu=0.01$, $\nu=0.8$, $\rho=0.1$, $\xi =0.001$, $\gamma_A =0.15$, $\gamma_I=0.1$, $\sigma=0.2$, $\eta=0.7$ and $\alpha=0.01$  hence $\mathcal{R}_0 \approx 0.9265$.}
    \end{minipage}
\end{figure}

\begin{figure}[p]
\setkeys{Gin}{width=\linewidth}
    \begin{subfigure}{0.475\linewidth}
    \includegraphics{example-image-a}%{1SAIRSI.pdf}
    \end{subfigure}\hfill
    \begin{subfigure}{0.475\linewidth}
    \includegraphics{example-image-b}%{1SAIRSII.pdf}
    \end{subfigure}
    
    \medskip
    \begin{subfigure}[c]{0.475\linewidth}
    \includegraphics{example-image-c}%{1SAIRSIII.pdf}
    \end{subfigure}\hfill
    \begin{minipage}{0.475\linewidth}
        \caption{Plot of system (4.1)-(4.4) with $\beta_A=0.2$, $\beta_I=0.1$, $b=0.55$, $\mu=0.01$, $\nu=0.8$, $\rho=0.1$, $\xi =0.001$, $\gamma_A =0.15$, $\gamma_I=0.1$, $\sigma=0.2$, $\eta=0.7$ and $\alpha=0.01$  hence $\mathcal{R}_0 \approx 0.9265$.}
    \end{minipage}
\end{figure}
\end{document}

演示

只是为了好玩，这里是子图定位选项效果的演示。红线显示基线位置。

子图定位选项

\documentclass{article}
\usepackage{subcaption}
\usepackage{xcolor}
        
\begin{document}
\begin{figure}
\begin{subfigure}{1in}
First Baseline\strut

default

Last Baseline\strut
\end{subfigure}\llap{\color{red}{\rule{1in}{0.5pt}}}
\begin{subfigure}[t]{1in}
First Baseline\strut

[t]

Last Baseline\strut
\end{subfigure}\llap{\color{red}{\rule{1in}{0.5pt}}}
\begin{subfigure}[c]{1in}
First Baseline\strut

[c]

Last Baseline\strut
\end{subfigure}\llap{\color{red}{\rule{1in}{0.5pt}}}
\begin{subfigure}[b]{1in}
First Baseline\strut

[b]

Last Baseline\strut
\end{subfigure}\llap{\color{red}{\rule{1in}{0.5pt}}}
\begin{subfigure}[T]{1in}
First Baseline\strut

[T]

Last Baseline\strut
\end{subfigure}\llap{\color{red}{\rule{1in}{0.5pt}}}
\begin{subfigure}[B]{1in}
First Baseline\strut

[B]

Last Baseline\strut
\end{subfigure}\llap{\color{red}{\rule{1in}{0.5pt}}}
\end{figure}
\end{document}

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