使用子图时出错

Question

\begin{figure}[h]
   \begin{subfigure} 
       \includegraphics[scale=0.2]{section7task4_1}
       \caption{low frequency noise}
   \end{subfigure}
   \begin{subfigure} 
       \includegraphics[scale=0.2]{section7task4_2}
       \caption{spectrally narrow noise}
   \end{subfigure}
\end{figure}

有人知道我为什么会犯这个错误吗？

Answer 1

与minipage环境类似，您必须指定subfigure环境的宽度，即\begin{subfigure}{<width>}。例如：

\documentclass{article}
\usepackage{subcaption}
\usepackage[demo]{graphicx}

\begin{document}

\begin{figure}[h]
   \begin{subfigure}{0.45\linewidth}
       \centering
       \includegraphics[scale=0.2]{section7task4_1}
       \caption{low frequency noise}
   \end{subfigure}\hfill
   \begin{subfigure}{0.45\linewidth}
       \centering
       \includegraphics[scale=0.2]{section7task4_2}
       \caption{spectrally narrow noise}
   \end{subfigure}
\end{figure}

\end{document}