# LaTeX/Counters

* LaTeX
* Getting Started
* Introduction
* Installation
* Installing Extra Packages
* Basics
* How to get help
* Common Elements
* Document Structure
* Text Formatting
* Paragraph Formatting
* Colors
* Fonts
* List Structures
* Special Characters
* Internationalization
* Rotations
* Tables
* Title creation
* Page Layout
* Customizing Page Headers and Footers‎
* Importing Graphics
* Floats, Figures and Captions
* Footnotes and Margin Notes
* Hyperlinks
* Labels and Cross-referencing
* Initials
* Mechanics
* Errors and Warnings
* Lengths
* Counters
* Boxes
* Rules and Struts
* Technical Text
* Mathematics
* Advanced Mathematics
* Theorems
* Chemical Graphics
* Algorithms
* Source Code Listings
* Linguistics
* Special Pages
* Indexing
* Glossary
* Bibliography Management
* More Bibliographies
* Special Documents
* Scientific Reports (Bachelor Report, Master Thesis, Dissertation)
* Letters
* Presentations
* Teacher's Corner
* Curriculum Vitae
* Academic Journals (MLA, APA, etc.)
* Creating Graphics
* Introducing Procedural Graphics
* MetaPost
* Picture
* PGF/TikZ
* PSTricks
* Xy-pic
* Creating 3D graphics
* Programming
* Macros
* Plain TeX
* Creating Packages
* Creating Package Documentation
* Themes
* Miscellaneous
* Modular Documents
* Collaborative Writing of LaTeX Documents
* Export To Other Formats
* Help and Recommendations
* FAQ
* Tips and Tricks
* Appendices
* Authors
* Links
* Package Reference
* Sample LaTeX documents
* Index
* Command Glossary
Counters are an essential part of LaTeX: they allow you to control the numbering mechanism of everything (sections, lists, captions, etc.). To that end each counter stores an integer value in the range of long integer, i.e., from $-2^{31}$ to $2^{31}-1$.

## Counter manipulation

In LaTeX it is fairly easy to create new counters and even counters that reset automatically when another counter is increased (think subsection in a section for example). With the command
* \newcounter{NameOfTheNewCounter}
you create a new counter that is automatically set to zero. If you want the counter to be reset to zero every time another counter is increased, use:
* \newcounter{NameOfTheNewCounter}[NameOfTheOtherCounter]
For example, if you want to enumerate the equations in each chapter independently, you can create something like an "equationschapter" counter that will be automatically reset at the begin of each section.
* \newcounter{equationschapter}[section]
* \section{First Section}
* I present one equation:
* \stepcounter{equationschapter} $a=b+c$ (Eq. \arabic{section}.\arabic{equationschapter})
* \section{Second Section}
* I present more equations:
* \stepcounter{equationschapter} $a=c+d$ (Eq. \arabic{section}.\arabic{equationschapter})
* \stepcounter{equationschapter} $d=e$ (Eq. \arabic{section}.\arabic{equationschapter})
To add to an existing counter another counter causing a reset when increased, use:
* \counterwithin*{NameOfTheCounter}{NameOfTheOtherCounter}
If this doesn't work it might be because of an old LaTeX version, the following should work in that case:
* \makeatletter
* \@addtoreset{NameOfTheCounter}{NameOfTheOtherCounter}
* \makeatother
To undo this effect one can use:
* \counterwithout*{NameOfTheCounter}{NameOfTheOtherCounter}
or:
* \makeatletter
* \@removefromreset{NameOfTheCounter}{NameOfTheOtherCounter}
* \makeatother
To increase the counter, either use
* \stepcounter{NameOfTheNewCounter}
or
* \refstepcounter{NameOfTheNewCounter} % used for labels and cross referencing
or
* \addtocounter{NameOfTheNewCounter}{number}
here the number can also be negative. For automatic resetting you need to use \stepcounter.
To set the counter value explicitly, use
* \setcounter{NameOfTheNewCounter}{number}

## Counter access

There are several ways to get access to a counter.
* \theNameOfTheNewCounter will print the formatted string related to the counter (note the "the" before the actual name of the counter).
* \value{NameOfTheNewCounter} will return the counter value which can be used by other counters or for calculations. It is not a formatted string, so it cannot be used in text.
* \arabic{NameOfTheNewCounter} will print the formatted counter using arabic numbers.
Note that \arabic{NameOfTheNewCounter} may be used as a value too, but not the others.
Strangely enough, LaTeX counters are not introduced by a backslash in any case, even with the \the command. plainTeX equivalents \count and \newcount\mycounter do abide by the backslash rule.

## Counter style

The following internal LaTeX commands will convert numeric value of specified counter into printable string and insert string into document:

### \arabic

    Numbers from $-2^{31}$ to $2^{31}-1$ inclusive converted to strings «-2147483648», «-2147483647», …, «-1», «0», «1», …, «2147483646», «2147483647».
    Example: 1, 2, 3, …

### \alph

    Numbers from 1 to 26 inclusive converted to strings «a», «b», …, «z». Other numbers (negative numbers, zero, 27, 28, …, $2^{31}-1$) converted to empty string.
    Example: a, b, c, …

### \Alph

    Same as \alph, but upper case letters used.
    Example: A, B, C, …

### \roman

    Numbers from 1 to 4999 inclusive converted to strings «i» (1), «ii» (2), …, «mmmmcmxcix» (4999), where «i» — 1, «v» — 5, «x» — 10, «l» — 50, «c» — 100, «d» — 500, «m» — 1000. Numbers from 5000 to $2^{31}-1$ inclusive converted to strings «mmmmm» (5000), «mmmmmi» (5001), …. Other numbers (negative numbers, zero) converted to empty string.
    Example: i, ii, iii, …

### \Roman

    Same as \roman, but upper case letters used.
    Example: I, II, III, …

### \fnsymbol

    Aimed at footnotes; prints a sequence of symbols.
    NumberSymbol(s) 1∗ 2† 3‡ 4§ 5¶ 6∥ 7∗∗ 8†† 9‡‡ Other numbersEmpty string
    Example: ∗, †, ‡, …

## LaTeX default counters

* part
* chapter
* section
* subsection
* subsubsection
* paragraph
* subparagraph
* page
* figure
* table
* footnote
* mpfootnote
For the enumerate environment:
* enumi
* enumii
* enumiii
* enumiv
For the eqnarray environment:
* equation

## Book with parts, sections, but no chapters

Here follows an example where we want to use parts and sections, but no chapters in the book class :
* \renewcommand{\thesection}{\thepart .\arabic{section}}
* \part{My Part}
* \section{My Section}
* \subsection{My Subsection}

## Custom enumerate

See the List Structures chapter.

## Custom sectioning

Here is an example for recreating something similar to a section and subsection counter that already exist in LaTeX:
* \newcounter{mysection}
* \newcounter{mysubsection}[mysection]
* \addtocounter{mysection}{2} % set them to some other numbers than 0
* \addtocounter{mysubsection}{10} % same
* \arabic{mysection}.\arabic{mysubsection}
* Blah blah
* \stepcounter{mysection}
* \arabic{mysection}.\arabic{mysubsection}
* Blah blah
* \stepcounter{mysubsection}
* \arabic{mysection}.\arabic{mysubsection}
* Blah blah
* \addtocounter{mysubsection}{25}
* \arabic{mysection}.\arabic{mysubsection}
* Blah blah and more blah blah