Text Formatting ⇒ Caption name issue using listings package

[Singularity]

The listings package won't load only some of my program files. The first file in the following MWE loads no problem, but the second one returns errors about inserting missing "$" and missing "}" and then about how it had extra or forgotten "$" and "}". Why doesn't it just not put in the extra "$" and "}"?

The issue seems to be the difference in caption names and, more specifically, that the second caption has a "2D" in it (or maybe because it has an underscore in it), which must look like math to TeXnicCenter.

How do I get it to recognize this as text? How do I get this working?

Thanks.

Code: Select all

\documentclass[]{article}
\usepackage{listings}
\begin{document}

\lstdefinestyle{mycode}{basicstyle=\small, % print whole listing small
	numbers=none,%left, numberstyle=\tiny, stepnumber=5, numbersep=5pt,
	frame=single,
	breaklines=true
}

\lstset{
	style=mycode,
	language=Octave,
	caption={initFPU.m},
	label={code:initFPU.m}
}
\lstinputlisting{code/kruskal/initFPU.m}

\lstset{
	style=mycode,
	language=Octave,
	caption={initFPU_2D.m},
	label={code:initFPU_2D.m}
}
\lstinputlisting{code/kruskal/initFPU_2D.m}
\end{document}

Note: you can't get this to work in writelatex without some files named initFPU.m and initFPU_2D.m.

[Singularity]

It seems I can fix it by putting a "\" before the "_". But it prints as a kind of short "_". If there's a better fix, I'm still interested.

[hugovdberg]

The underscore is indeed an active character that is only allowed in mathmode. So to print a literal _ you need \_, which simply prints the underscore from the current font. In the default font this is a rather narrow character, to make a wider underscore you could something like this:

Code: Select all

\documentclass{article}

% change the letter inside the [LaTeX]\hphantom[/LaTeX] to a wider or narrower character to change the width of the underscore
\newcommand{\wideunderscore}{\underline{\hphantom{n}}}

\begin{document}
init\wideunderscore 2D

init\_2D
\end{document}