[Tex/LaTex] Per section figure numbering – reset counter each section

floatsgraphicsnumbering

I would like to achieve book like figure numbering for my article class document. MWE:

\documentclass[11pt,a4paper]{article}
\usepackage{graphicx}

% optionally - this creates: Figure 1.1 ... Figure 2.2
%\renewcommand{\thefigure}{\arabic{section}.\arabic{figure}}

\begin{document}

\section{first section}

\begin{figure}[h]
  \centering
    \includegraphics[width=\textwidth]{1.png}
    \caption{figure 1.1} % should be 1.1
\end{figure}

\section{second section}

\begin{figure}[h]
  \centering
    \includegraphics[width=\textwidth]{1.png}
    \caption{figure 2.1} % should be 2.1 - actually is 2 or 2.2 with optional code
\end{figure}

\end{document}

I do not want to reset the counter manually on each section.

Best Answer

This is easily achieved using \numberwithin from the amsmath package.

\documentclass[11pt,a4paper]{article}
\usepackage{graphicx}
\usepackage{amsmath}
\numberwithin{figure}{section}

\begin{document}
\section{first section}

\begin{figure}[h]
  \centering
    \rule{4cm}{4cm}  % replace with image
    \caption{figure 1.1} 
\end{figure}

\section{second section}

\begin{figure}[h]
  \centering
    \rule{4cm}{4cm}  % replace with image
    \caption{figure 2.1} 
\end{figure}
\end{document}

captions

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