Math & Science ⇒ References to Equations work only partially

[21did21]

Hello world !

i don't understand one thing :

i use the environnement \begin{equation} with a \label{eq9}
in my text i put this command ( \eqref{eq9} ) to cite this equation.

=> It works nice but for some equations in my document it doesn't works !

could you explain the reasons that could cause it does not work

thanks

[Stefan Kottwitz]

Hi,

possible reasons are not matching label names.
Perhaps just show a minimal working example, where \eqref doesn't work for you.

We had a similar question here: Problem with Equation Reference, but also there was not sufficient information given by the questioner. You know, just it doesn't work. In that case the questioner probably forgot to load amsmath, wich provides \eqref.

Stefan

[21did21]

OK sorry.

this is my code :

Code: Select all

\documentclass[final,5p,times,twocolumn]{elsarticle}
\usepackage{graphics}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{lineno}
\usepackage{color}
\usepackage{multirow}
\usepackage{multicol}
\usepackage{cuted}
\journal{gggggggg}
\begin{document}
\begin{frontmatter}
\title{\huge{dfsqcsdcsdvds}}
\author[labelAAA]{azert qwerty}
\address[labelAAA]{pmoi pmoi}

\begin{abstract}
bbbbbbbbbbbbbbbbbbbbbbbbbb
\end{abstract}

\begin{keyword}
ddd \sep ffff
\PACS XXXXXXXXXXXXXXXXXX \sep xxxxxxxxxx

\end{keyword}
\end{frontmatter}

\section{Introduction}
\label{intro.sec}

blablabla \eqref{eq1} \eqref{eq12}

\begin{equation}
a=\frac{789\pi}{\lambda}sin\left(\frac{\theta}{45684}\right)
\label{eq1}
\end{equation}

edfvefvdzvedvrever
vfev
re
ver
v
re

\begin{equation}
AAAA_oppo(x)=opmlk\mu iop
\label{eq12} 
\end{equation}

...

when i compil this \eqref{eq1} works but \eqref{eq12} no

=> it seems that when i have to number eq10 eq11 eq12 eq13 ....
it don't works

[Stefan Kottwitz]

This code works for me, \eqref{eq12} works fine. Could you post your .log file here, as attachment, for this test code?

Stefan

[21did21]

hello!

now this example works, i just have to compil 2 times.

=> but my real .tex doesn't work even if i compil 5 times

[Stefan Kottwitz]

now this example works, i just have to compil 2 times.

Yes, a newly created (or updated) document may require two times compilations: int he first, the labels are written to the .aux file (yet references are unknown), in the second run LaTeX is able now to see the labels in the .aux file and can print the references.

=> but my real .tex doesn't work even if i compil 5 times

You could always make a copy and hack it down step by step, in each step compile 2 times and check. Either

• the error goes away, so you have located the problem to exactly the code piece you removed in the step - fix that piece or show it
• or the error remains, you end with a small example which shows the error and which you can post.

While hacking down always is a good way, building a new "similar" example is no guarantee that the error can be recreated, as you have noticed.

Stefan

[21did21]

thanks stefan for your help !

now it works (but i don't now why )