I'm writing a report about a website I'm working on to play cards online. I use lstlisting to display my PHP, JavaScript and HTML code. The problem is that I'm using a lot of µ's in my JavaScript codes. For example:

\begin{lstlisting}[caption=some code]
  µ.a('error', µ.m('Server responded: ' + r));

I use the micro symbol because i wanted to have a shortcut for certain functions.

Now, the problem is that LaTeX won't compile these µ's. As output I get to see .a('error', .m('Server responded: ' + r)); LaTeX simply seems to ignore those µ's. I tried to fix this by using:


but this leads to an error: Package utf8x Error: Character181appearedalone.

Any toughts on how to fix this? Thanks!

  • Is xelatex/lualatex + fontspec an option? If so, all problems should just go away (no inputenc required) Apr 24 '12 at 15:38
  • I'm sorry, I'm relatively new to LaTeX. Are these things just packages or ... ? EDIT: I'm using MikTeX, and doesn't that have XeTeX included?
    – Sebastian
    Apr 24 '12 at 15:48
  • It is possible, I had the same problem displaying \alpha and \beta. I hope I still have the source of this old report, just a sec... Edit: found it, you can use \begin{lstlisting}[escapechar=\#] and then #$\alpha$# or #$\mu$# in your case.
    – Ailurus
    Apr 24 '12 at 16:09
  • But then I'd have to change all my appearances of µ in my code, wouldn't I?
    – Sebastian
    Apr 24 '12 at 16:18

(pdf)latex solution:

If you use the symbol µ only inside lstlisting you can use the option literate.

Here an example



\begin{lstlisting}[caption=some code,literate={µ}{$\upmu$}1]
  µ.a('error', µ.m('Server responded: ' + r));

enter image description here

  • Thanks, this actually does the trick! I already tried something with literate, but that didn't work, but your code does. :) Of course it would be handier to just use µ everywhere in my document, and not only inside lstlisting, but that can be easily fixed with \textmu I assume.
    – Sebastian
    Apr 24 '12 at 16:17
  • 2
    @Sebastian: You can also use it inside the document body. Therefor you should have a look at this question: tex.stackexchange.com/questions/28031/… Apr 24 '12 at 16:20
  • For anyone in future that wants to use literate but it may not work: check if you have the correct sign at all places and copy&paste them. I tried the example in the question for myself (did not copy Marco’s answer but wrote the literate myself) and could not get it to work until I copied the whole answer. There is 'MICRO SIGN' (U+00B5) (the one that is used in the question and answer) and then there is 'GREEK SMALL LETTER MU' (U+03BC) that my keyboard layout g
    – bugybunny
    Oct 3 '16 at 8:07

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