latex 插图图片代码

插入两张并排图片：

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\begin{figure}[htbp]
    \centering % 居中
    \begin{subfigure}[t]{0.49\textwidth} % 第一个子图，宽度为文本宽的45%
        \centering
        \includegraphics[width=\linewidth]{Fig/20251019/finalSpectrum0.png} % \linewidth 使图片宽度与子图环境宽度一致
        \caption{The original condition is 0.} % 子图标题
        \label{fig:sub1} % 子图标签
    \end{subfigure}
    \hfill % 填充水平空间，将两个子图分开
    \begin{subfigure}[t]{0.49\textwidth} % 第二个子图
        \centering
        \includegraphics[width=\linewidth]{Fig/20251019/finalSpectrum01.png}
        \caption{The original condition is N(0,1).}
        \label{fig:sub2}
    \end{subfigure}
    \caption{A direct comparison was performed using a common color bar for the results under the original condition of 0 and those under the standard normal distribution, N(0,1).} % 总标题
    \label{fig:my_figure} % 总标签
  \end{figure}

插入2*2排版图片

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\begin{figure}[htbp]
    \centering
    % 第一行
    \begin{subfigure}[t]{0.49\textwidth}
        \centering
        \includegraphics[width=\linewidth]{Fig/20251026/cgmg/real_solution.png}
        \caption{The original condition is 0.}
        \label{fig:sub1}
    \end{subfigure}
    \hfill
    \begin{subfigure}[t]{0.49\textwidth}
        \centering
        \includegraphics[width=\linewidth]{Fig/20251026/cgmg/num_solution.png}
        \caption{The original condition is N(0,1).}
        \label{fig:sub2}
    \end{subfigure}
    
    % 第二行 - 添加垂直间距
    \vspace{0.5cm}
    
    % 第二行
    \begin{subfigure}[t]{0.49\textwidth}
        \centering
        \includegraphics[width=\linewidth]{Fig/20251026/cgmg/2D_error.png}
        \caption{Additional condition 1.}
        \label{fig:sub3}
    \end{subfigure}
    \hfill
    \begin{subfigure}[t]{0.49\textwidth}
        \centering
        \includegraphics[width=\linewidth]{Fig/20251026/cgmg/e_with_its.png}
        \caption{Additional condition 2.}
        \label{fig:sub4}
    \end{subfigure}
    
    \caption{A direct comparison was performed using a common color bar for the results under different initial conditions.}
    \label{fig:my_figure}
\end{figure}