General ⇒ Problem with cross-references

[carol]

I don't what could disable the cross-reference. I use the cross-reference correctly to the tables or sections but when I compile, I don't get any error message and the cross-reference doesn't get displayed in the text. Any package loading or definition that might disable the cross-reference?

Thanks

[gmedina]

Hi,

can you please post a minimal working example showing the undesired behaviour?

[carol]

Yes, here it is:

Code: Select all

\documentclass[10pt]{report}    
% Load packages

\usepackage{tabularx}

\begin{document}

Ref to tab \ref{tab:tab}.
    \par
	\begin{table}
    \mbox{
      \begin{tabular}{|c|c|c|}
        \hline \multicolumn{3}{|c|}{My Table}\\ \hline
        A1 & B2  & C3 \\ \hline
        A2 & ... & .. \\ \hline
        A3 & ..  & .  \\ \hline
      \end{tabular}
      }
	\label{tab:tab}
	\end{table}
\end{document}

[gmedina]

Hi, inside floating environments (table and figure, and those defined by the user) you need to use the \caption command before the \label command, in order to generate the string that will be picked up by the \ref command:

Code: Select all

\documentclass[10pt]{report}    
\usepackage{tabularx}
\usepackage{hyperref}

\begin{document}

Ref to tab \ref{tab:tab}.
\begin{table}
  \begin{tabular}{|c|c|c|}
   \hline \multicolumn{3}{|c|}{My Table}\\ \hline
  A1 & B2  & C3 \\ \hline
  A2 & ... & .. \\ \hline
  A3 & ..  & .  \\ \hline
  \end{tabular}
  \caption{a test table}
  \label{tab:tab}
\end{table}

\end{document}

Compile the document twice.

[carol]

As you noticed the sentence "Ref to tab" gets displayed after the table but it comes before the table. THis depends on the position of \begin{table}. On the other hand, I can't put \begin{table} inside of \mbox. What would you suggest?

[gmedina]

You can control the positioning of floats using the placement specifiers; most of the times you want to use [!ht]; your code would look something like:

Code: Select all

\begin{table}[!ht]
  \begin{tabular}{|c|c|c|}
   \hline \multicolumn{3}{|c|}{My Table}\\ \hline
  A1 & B2  & C3 \\ \hline
  A2 & ... & .. \\ \hline
  A3 & ..  & .  \\ \hline
  \end{tabular}
  \caption{a test table}
  \label{tab:tab}
\end{table}

Search the board to see how to proceed if you don't want your tables and/or figures to float at all.

[carol]

Is it possible to cross-refer to section*? If so, why the name of the section is not displayed?

Code: Select all

\documentclass[10pt]{report}    
\begin{document}
refer to the section \ref{sec:my_section}
\section*{my section} \label{sec:my_section}
\end{document}

[kostas]

Using \label and \ref are not meant to be used when you want to refer to the "title" of a section/table/figure but when you want to refer to the "number" of a section/table/figure. Because your section uses a * to drop the numbering, you get nothing in your output.

Compare this with the following example where I deleted the *.

Code: Select all

\documentclass[10pt]{report}   
\begin{document}

refer to the section \ref{section:my_section}

\section{my section}\label{section:my_section}

\end{document}

The output is this:

examplep.jpg (9.47 KiB) Viewed 13207 times

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