General ⇒ references and indexing (eq and fig)

[jezikk]

Hi,
in my project all equations and figures are indexed like 1,2,3...n. Could you help me, how to make indexing (for example) like 2.1,2.2,2.3....3.1,3.2... for eq. and fig.??
Thank you


PS: sry for my bad english

[localghost]

First of all I would call that numbered and not indexed. From your descriptions I assume that you are using an article class without chapters. There are two steps needed to get the numbering as desired.

For the equations (and all other mathematical expressions) there is the (preferably to use) amsmath package. It provides a command that redefines the counter for equations so that it can be reset in every section.

For the figures (or floats in general) there is the caption package. It lets you customize the captions of floats in many ways and provides settings to get the same effect as for the equations.

So, enough words now. A code example will show how to get the desired result.

Code: Select all

\documentclass[11pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage[english]{babel}
\usepackage[font=small,labelfont=bf]{caption}
\usepackage{bindingoffset=1cm,centering,includeheadfoot,margin=2cm]{geometry}
\usepackage{amsmath}
\usepackage{txfonts}
\usepackage{blindtext}

% Changing float numbering (caption)
\captionsetup{%
  figurewithin=section,
  tablewithin=section
}

% Changing equation numbering (amsmath)
\numberwithin{equation}{section}

\begin{document}
  \section{First section}
  \blindtext

  \begin{figure}[!ht]
    \centering
    \rule{8cm}{4.5cm}
    \caption{A dummy figure}\label{fig:dummy}
  \end{figure}

  \section{Second section}
  \blindtext
  \begin{equation}\label{eqn:einstein}
    E=mc^2
  \end{equation}
  \blindtext
\end{document}

The change of equation numbering with the command from amsmath principally works also for floats, but in my opinion is better done with the caption package. All other mathematical environments are numbered by sections, too.


Best regards
Thorsten¹

[jezikk]

Thank you for your help