图形编号用什么？

Question

如何使用 Figure 获得具有适当数字的图形\ref{x}？

我尝试编译我的.tex文档两次，但没有帮助。我收到以下警告：\label whitout proper reference。我不知道该怎么办了 :/。

Figure \ref{Schematic_representation_of_a_spectrophotometer}`

\begin{figure}[h!]

    \centering
        \makebox[\textwidth]{
            \includegraphics[scale=1]{./Spectroscopy_and_microscopy_techniques/media/abs.png}
            \caption[Schematic representation of a spectrophotometer. ] {\textbf{Schematic representation of a spectrophotometer. }{ description.}}}
            \label{Schematic_representation_of_a_spectrophotometer}     
\end{figure}

然后我编译了多次之后，得到了图??

谢谢

Answer 1

正如 David Carlisle 指出的那样，问题似乎出在\makebox。尝试将其删除。作为备注，我还将定位参数更改为[htb]，尤其是对于大图片，这[h!]可能会给 TeX 带来问题。

\documentclass{article}
\usepackage{graphicx}
\begin{document}
Figure \ref{Schematic_representation_of_a_spectrophotometer}

\begin{figure}[htb]
  \centering
  \includegraphics[scale=0.5]{example-image}
  \caption[Schematic representation of a spectrophotometer. ] {\textbf{Schematic representation of a spectrophotometer. }{ description.}}
  \label{Schematic_representation_of_a_spectrophotometer}     
\end{figure}

\end{document}

如果目的是使图片与文本宽度相同，则figure可以将环境写为

\begin{figure}[htb]
  \includegraphics[width=\linewidth]{example-image}
  \caption[Schematic representation of a spectrophotometer. ] {\textbf{Schematic representation of a spectrophotometer. }{ description.}}
  \label{Schematic_representation_of_a_spectrophotometer}     
\end{figure}