按列行顺序排列的多个图形标题

Question

我有 4 个图，我希望每个图都有一个标题。例如，如果我关注这，它们看起来就像

Fig1.   Fig2.
(a)     (b)
Fig3.   Fig4.
(c)     (d)

但我希望他们的标题被组织成

Fig1.   Fig3.
(a)     (c)
Fig2.   Fig4.
(b)     (d)

我应该怎么办？

Answer 1

您可以操作计数器subcaption来改变编号顺序。

\documentclass{article}
\usepackage{graphicx}

\usepackage{subcaption}

\captionsetup[subfigure]{labelfont=bf}

\begin{document}
    
\begin{figure}
    \centering
    
    \begin{subfigure}{.5\textwidth}
        \centering
        \includegraphics[width=.4\linewidth]{example-image}
        \caption{A subfigure 1}
        \label{fig:sub1}
    \end{subfigure}%
    \begin{subfigure}{.5\textwidth}
        \setcounter{subfigure}{2} % set next caption to c
        \centering
        \includegraphics[width=.4\linewidth]{example-image}
        \caption{A subfigure 2}
        \label{fig:sub2}
    \end{subfigure}\\
    \bigskip
    \begin{subfigure}{.5\textwidth}
        \setcounter{subfigure}{1} % set next caption to b
        \centering
        \includegraphics[width=.4\linewidth]{example-image}
        \caption{A subfigure 3}
        \label{fig:sub3}
    \end{subfigure}%
    \begin{subfigure}{.5\textwidth}
        \setcounter{subfigure}{3} % set next caption to d
        \centering
        \includegraphics[width=.4\linewidth]{example-image}
        \caption{A subfigure 4}
        \label{fig:sub4}
    \end{subfigure}     
    \caption{ Main caption}\label{fig:main}
\end{figure}
    
See the figure~\ref{fig:sub2} in the upper left of the Figure~\ref{fig:main}.
\end{document}

更新后续问题：使用子浮点数

\documentclass[12pt,a4paper]{article}   

\usepackage{graphicx}
\usepackage{subcaption}

\captionsetup[figure]{font=sf}
\captionsetup[sub]{labelfont=bf}

\begin{document}

\begin{figure}
    \centering
    \subfloat[Subfigure 1/4 \label{subfig:s1}]{\includegraphics[width=0.4\textwidth]{example-image}}
    \setcounter{subfigure}{2}  % set next caption to c
    \hfill
    \subfloat[Subfigure 3/4 \label{subfig:s2}]{\includegraphics[width=0.4\textwidth]{example-image}}\\
    \bigskip
    \setcounter{subfigure}{1} % set next caption to b
    \subfloat[Subfigure 2/4 \label{subfig:s3}]{\includegraphics[width=0.4\textwidth]{example-image}}
    \setcounter{subfigure}{3} % set next caption to d
    \hfill
    \subfloat[Subfigure 4/4 \label{subfig:s4}]{\includegraphics[width=0.4\textwidth]{example-image}}\\
    \caption{ Main caption}\label{fig:main}
\end{figure}

See the figure~\ref{subfig:s2} in the upper left of the Figure~\ref{fig:main}.

\end{document}

Answer 2

使用我们对minipage列中的数字进行分组：

\documentclass[12pt,a4paper]{article}
\usepackage{graphicx}
\usepackage{subcaption}
    \captionsetup[figure]{font=sf}
    \captionsetup[sub]{skip=1ex, belowskip=2ex, labelfont=bf}

\begin{document}

\begin{figure}
    \centering
    \setkeys{Gin}{width=\linewidth}
\begin{minipage}{0.4\linewidth}
    \subfloat[Subfigure 1/4 \label{subfig:s1}]{\includegraphics{example-image-duck}}

    \subfloat[Subfigure 2/4 \label{subfig:s2}]{\includegraphics{example-image-duck}} 
\end{minipage}
    \hfil
\begin{minipage}{0.4\linewidth}
    \subfloat[Subfigure 3/4 \label{subfig:s3}]{\includegraphics{example-image-duck}}

    \subfloat[Subfigure 4/4 \label{subfig:s4}]{\includegraphics{example-image-duck}}
\end{minipage}
    \caption{Main caption}
    \label{fig:main}
\end{figure}

See the figure~\ref{subfig:s2} in the bottom left of the Figure~\ref{fig:main}.

\end{document}