Synopsis:
\label{key}
Assign a reference number to key. In ordinary text \label{key}
assigns to key the number of the current sectional unit. Inside an environment with numbering, such as a table
or theorem
environment, \label{key}
assigns to key the number of that environment. Retrieve the assigned number with the \ref{key}
command (see \ref).
A key name can consist of any sequence of letters, digits, or common punctuation characters. Upper and lowercase letters are distinguished, as usual.
A common convention is to use labels consisting of a prefix and a suffix separated by a colon or period. Thus, \label{fig:Post}
is a label for a figure with a portrait of Emil Post. This helps to avoid accidentally creating two labels with the same name, and makes your source more readable. Some commonly-used prefixes:
ch
for chapters
sec
subsec
for lower-level sectioning commands
fig
for figures
tab
for tables
eq
for equations
In the auxiliary file the reference information is kept as the text of a command of the form \newlabel{label}{{currentlabel}{pagenumber}}
. Here currentlabel is the current value of the macro \@currentlabel
that is usually updated whenever you call \refstepcounter{counter}
.
Below, the key sec:test
will get the number of the current section and the key fig:test
will get the number of the figure. (Incidentally, put labels after captions in figures and tables.)
\section{section name} \label{sec:test} This is Section~\ref{sec:test}. \begin{figure} ... \caption{caption text} \label{fig:test} \end{figure} See Figure~\ref{fig:test}.
© 2007–2018 Karl Berry
Public Domain Software
http://latexref.xyz/_005clabel.html