I'm writing MATLAB code in LaTeX and I would like to be able to cut and paste it directly into the MATLAB command window. One critical symbol is the ' (single quote). When processed by LaTeX it shows up as a curly quote sign, which MATLAB doesn't recognize. I've looked through the "Comprehensive Symbol Table", but I couldn't find anything. The csquotes package looks as though it might be helpful, but I found the manual incomprehensible.
[Tex/LaTex] LaTeX symbol for single quote mark that MATLAB will recognize
csquotesMATLABsymbols
Related Solutions
Your example works well if you add the two packages to your preamble:
\usepackage{xcolor}
\usepackage{textcomp}
Tested with TeX Live 2012.
Following David Carlisle's suggestion here's a TikZ solution:
\documentclass{standalone}
\usepackage{tikz}
% w/o following space!
\newcommand{\quem}{\tikz[baseline=(wi.base)]{\node[fill=black,rotate=45,inner sep=.1ex, text height=1.8ex, text width=1.8ex] {};%
\node[ font=\color{white}] (wi) {?};}}
\begin{document}
Some \quem Text
\end{document}
You may alter the size of the black triangle by playing with inner sep and keep in mind that there is no space an the end of the macro.
Best Answer
Discovered the answer, related to Paul Gessler's comment. There's a wonderful style file called mcode.sty that uses the listings package but seems to deal with some of it's shortcomings.
http://www.mathworks.com/matlabcentral/fileexchange/8015-m-code-latex-package