Graphics, Figures & Tables ⇒ figure label not correct

[neumannturing]

Hello,
I use \numberwithin{figure}{section} at the header. But later when I label and refer a figure (using \label{} and \ref{}). The number does not show up correctly.
For example, all figures in section 3 show up as 3 in the reference. What is the problem? Thank you.

[gmedina]

Hi,

please post a minimal working example that allows us to reproduce the odd behaviour mentioned.

[neumannturing]

Minimal example:
\documentclass[12pt]{amsart}
\usepackage{graphicx}
\numberwithin{figure}{section}
\begin{document}
\section{introduction}
\section{example}
Problem is here Fig.~\ref{fig:3}. But It should be 2.1
\begin{figure}[hbt]\label{fig:3}
\includegraphics[scale=0.5]{triTri}
\caption{$p$ is a vertex of $\O$.}
\end{figure}
\end{document}

[gmedina]

Hi,

in float environments such as figure and table, the \label command should always go after the \caption command. Example:

Code: Select all

\documentclass[12pt]{amsart}

\numberwithin{figure}{section}

\begin{document}

\section{introduction}
\section{example}
Problem solved. Fig.~\ref{fig:3} produces the expected value.
\begin{figure}[!hbt]
  \centering
  \rule{5cm}{3cm}% just to simulate an actual figure
  \caption{$p$ is a vertex of $\O$.}
  \label{fig:3}
\end{figure}

\end{document}

Please notice that I used a black rectangle to simulate an actual figure and make the example compilable for everyone.

[neumannturing]

Just as gmedi's post.