LyX ⇒ Lyx returns question marks [??] instead of figure number

[Fed89]

Hello,

i have been looking around but could not find a solution to my problem.
I have started a new document in lyx and when i make a cross reference to a label (figure/table/equation) the pdf shows just [??] question marks.

Example of code of a picture

Code: Select all

\begin{figure}
\begin{centering}
\includegraphics[width=0.7\columnwidth]{DTUKEM_Viscosity_35%}
\par\end{centering}

\protect\caption{Dynamic viscosity of the propylene glycol/water mixture from Høje
Taastrup field as function of temperature.}
\label{fig:GlycWatViscosVSTemp_35pc}
\end{figure}

i have another lyx file, written time ago, same class and same way of doing cross reference and there they are shown correctly. really wierd...
does anyone know that can be the problem?

thanks in advance

Federico

[Stefan Kottwitz]

Hi Federico,

nice to see you again in the forum! I remember your first post in 2013. It's great that you continue using LyX and LaTeX!

Regarding the references: LyX/LaTeX always need at least two runs to display references correctly. The reason is, that in one run LaTeX writes the labels/references to an external file (with the .aux extension), which is read in during the next run. So, in the first run LaTeX can only show ?? as place holder, which will be updated in the next run.

By the way, instead of \begin{centering} ... \end{centering} better use \centering. It is a command (switch), not an environment. The centering effect ends anyway at the end of the figure environment. That's common with environments: a local setting ends when the outer environment ends.

Well, at the second look I see, that you center the image but not the caption. Is this intended? If yes,
I would still use \centering, but grouped as {\centering .... \par}

Btw. I don't understand why \protect is used before \caption. Is there a reason? It's sometimes used within the argument of \caption, yes, for reasons, but not onto \caption itself.

Stefan

[Fed89]

Thanks for the reply Stefan!

i have read that 2 compilations may be necessary, but this is not my case. i run it way more than twice, but still nothing happens.
the code you see is the one from lyx, so i do not write it myself. i was wondering what was the meaning of the protect command...
same thing is for the centering command: it is what is used by lyx when i center the figure, i do not write it myself.
still, i do not think it is the reason of the problem. i have also a table and an equation in the same file, so no centering or such, and still their references give ?? when compiling...

even weirder is that anther lyx file i created months ago, show references correctly when i run it... and i think i inserted pics, label and reference exactly in the same way

[Stefan Kottwitz]

Perhaps make a LaTeX export of the document (you could take a reduced copy, which still shows the problem), and post it here. You could also post the .aux file (where the references are) and the .log file. All together may show us the reason.

Stefan

[Fed89]

okay, thanks a lot! i ll do it on monday, as it is on my office computer

[Fed89]

Hello,
i copy paste the requested codes you requested.

Reference to figure, table and equation are equally NOT-working

So this is the source code from Lyx (just taken the relevant part with the references and deleted most of the text.

Code: Select all

% Preview source code

%% LyX 2.1.0 created this file.  For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
\documentclass[british]{report}
\usepackage[T1]{fontenc}
\usepackage[latin9]{inputenc}
\setcounter{secnumdepth}{3}
\setcounter{tocdepth}{3}
\usepackage{amsmath}
\usepackage{graphicx}

\makeatletter

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% LyX specific LaTeX commands.
%% Because html converters don't know tabularnewline
\providecommand{\tabularnewline}{\\}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands.
\usepackage{appendix} %

\usepackage{array} % package for modifying table properties
\setlength{\extrarowheight}{2pt} % to add extra spacing between table rows (only top)
\usepackage{url}
\usepackage{emptypage} % to delete footer/header/page numbers in empty pages
\makeatother

\usepackage{babel}
\begin{document}
\begin{table}
\protect\caption{Comparison between measured and extrapolated densities for $35\%$
glycol/water mixture.}
\label{tab:density35pcExperVSextrap}

\centering{}%
\begin{tabular}{cccc}
\hline 
$T$ & \multicolumn{3}{c}{$\rho$ $\left[\mathrm{kg/m^{3}}\right]$ for $x=35\%$}\tabularnewline
\cline{2-4} 
$\left[^{\circ}\mathrm{C}\right]$ & Measured & Extrapolated & $\Delta_{rel}$\tabularnewline
\hline 
\hline 
20 & 1028.8 & 1028.7 & -0.01\%\tabularnewline
\hline 
30 & 1023.4 & 1023.3 & -0.01\%\tabularnewline
\hline 
40 & 1017.6 & 1017.5 & -0.01\%\tabularnewline
\hline 
50 & 1011.3 & 1011.3 & 0.00\%\tabularnewline
\hline 
60 & 1004.6 & 1004.8 & 0.02\%\tabularnewline
\hline 
70 & 997.6 & 997.8 & 0.02\%\tabularnewline
\hline 
80 & 990.1 & 990.5 & 0.04\%\tabularnewline
\hline 
\end{tabular}
\end{table}


The experimental values for dynamic viscosity obtained for the sample
from Høje Taastrup field (see Table \ref{fig:GlycWatViscosVSTemp_35pc}) 

\begin{figure}
\begin{centering}
\includegraphics[width=0.5\columnwidth]{DTUKEM_Viscosity_35pc}
\par\end{centering}

\protect\caption{Dynamic viscosity of the propylene glycol/water mixture.}
\label{fig:GlycWatViscosVSTemp_35pc}
\end{figure}

The measured viscosity values are shown as markers in Figure \ref{fig:GlycWatViscosVSTemp_35pc}.
Hence, the viscosity of the heat transfer fluid in Høje Taastrup field
was calculated by the piecewise function Eq.(\ref{eq:mu_35pc_glycol}),
consisting of the third degree polynomial and the power function,
whose trends can also be seen in Figure \ref{fig:GlycWatViscosVSTemp_35pc}.

\begin{equation}
\mu=\begin{cases}
7.289-2.337\cdot10^{\textrm{-}1}\, T+3.066\cdot10^{\textrm{-}3}\, T^{2}-1.449\cdot10^{\textrm{-}5}\, T^{3} & 20\,\mathrm{^{\circ}C}<T<40\,\mathrm{^{\circ}C}\\
180.29\, T^{\textrm{-}1.232} & T\geq40\,\mathrm{^{\circ}C}
\end{cases}\label{eq:mu_35pc_glycol}
\end{equation}

\end{document}

This is the log file

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This is pdfTeX, Version 3.1415926-2.5-1.40.14 (MiKTeX 2.9) (preloaded format=pdflatex 2014.11.27)  21 SEP 2015 15:02
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LaTeX Warning: Reference `fig:GlycWatViscosVSTemp_35pc' on page 1 undefined on 
input line 90.


<0C__Users_febav_Dropbox_PhD_PressureDropModel_F___mple35__h__jeTaastrup_DTUKEM
_Viscosity_35pc.pdf, id=1, 482.22758pt x 382.39864pt>
File: 0C__Users_febav_Dropbox_PhD_PressureDropModel_F___mple35__h__jeTaastrup_D
TUKEM_Viscosity_35pc.pdf Graphic file (type pdf)

<use 0C__Users_febav_Dropbox_PhD_PressureDropModel_F___mple35__h__jeTaastrup_DT
UKEM_Viscosity_35pc.pdf>
Package pdftex.def Info: 0C__Users_febav_Dropbox_PhD_PressureDropModel_F___mple
35__h__jeTaastrup_DTUKEM_Viscosity_35pc.pdf used on input line 94.
(pdftex.def)             Requested size: 172.5pt x 136.78816pt.

LaTeX Warning: Reference `fig:GlycWatViscosVSTemp_35pc' on page 1 undefined on 
input line 102.


LaTeX Warning: Reference `eq:mu_35pc_glycol' on page 1 undefined on input line 
104.


LaTeX Warning: Reference `fig:GlycWatViscosVSTemp_35pc' on page 1 undefined on 
input line 106.


Overfull \hbox (11.97061pt too wide) detected at line 113
\OML/cmm/m/it/10  \OT1/cmr/m/n/10 = []
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[1{C:/Users/febav/AppData/Local/MiKTeX/2.9/pdftex/config/pdftex.map}

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ty_35pc.pdf>]
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Runaway argument?
{\contentsline {table}{\numberline {1}{\ignorespaces Comparison betwe\ETC.
! File ended while scanning use of \@writefile.
<inserted text> 
                \par 
l.117 \end{document}
                    
I suspect you have forgotten a `}', causing me
to read past where you wanted me to stop.
I'll try to recover; but if the error is serious,
you'd better type `E' or `X' now and fix your file.


LaTeX Warning: There were undefined references.

 ) 
Here is how much of TeX's memory you used:
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while this is the aux file

Code: Select all

\relax 
\@writefile{lot}{\contentsline {table}{\numberline {1}{\ignorespaces Comparison between measured and extrapolated densities for $35%$ glycol/water mixture.}}{1}}
\newlabel{tab:density35pcExperVSextrap}{{1}{1}}
\@writefile{lof}{\contentsline {figure}{\numberline {1}{\ignorespaces Dynamic viscosity of the propylene glycol/water mixture.}}{1}}
\newlabel{fig:GlycWatViscosVSTemp_35pc}{{1}{1}}
\select@language{british}
\@writefile{toc}{\select@language{british}}
\@writefile{lof}{\select@language{british}}
\@writefile{lot}{\select@language{british}}
\newlabel{eq:mu_35pc_glycol}{{1}{1}}

thanks in advance!
any help is welcome

[cgnieder]

The problem is in the aux file in the second line where you see $35%$. Everything after % is ignored which causes an error. The log file says:

Code: Select all

Runaway argument?
{\contentsline {table}{\numberline {1}{\ignorespaces Comparison betwe\ETC.
! File ended while scanning use of \@writefile.
<inserted text>
                \par
l.32 \begin{document}

Didn't you get a message about the compilation error?

Once this is solved everything should just work nicely including the references. I suspect – because the input file looks OK – that you just need to delete the aux file and then recompile once or twice (I don't know how LyX handles compiling so maybe once actually is enough…)

Regards

[Stefan Kottwitz]

Yes it should be that percent sign % in the .aux file. Though in the source it's ok, as Clemens said. Also I would delete the .aux file which will be regenerated in the next run.

Stefan

[Fed89]

Thanks!!! yes you are right, the problem is the % symbol in the table caption. But deleting the aux file does not make any difference, as the new one is the same as before
The % symbol is in inside the equation now. i also tried to put it outside the equation, or inside the equation as \textrm or \mathrm but the problems appears anyway.
Does it mean i cannot put % symbol in a caption?

[Johannes_B]

Don't use math mode. The comment stays a comment there as well. Use \% instead.