Why can’t I use the Euro symbol (€) with siunitx

eurosymsiunitxsymbols

I was just trying to define my own Euro (€) unit with \DeclareSIUnit{\myeuro}{€}, but couldn't get it to work. In the process I made the following MWE with a few different attempts that all don't seem to work. Anyone has an idea what could be going on and how to fix this?

\documentclass{article}
\usepackage{eurosym,textcomp,siunitx}
\DeclareSIUnit{\myalpha}{\alpha} %alpha just for comparison
\DeclareSIUnit{\myeuro}{€}
\DeclareSIUnit{\myeuroo}{\euro}
\DeclareSIUnit{\myeurooo}{\texteuro}

\begin{document}
Unicode symbol (€), euro (\euro) and texteuro (\texteuro)
all work fine in text, but for some reason I can't
use them in the qty command of siunitx:\\
Line 1: \qty{5}{\alpha}\\
Line 2: \qty{5}{\myalpha}\\
Line 3: \qty{5}{€}\\
Line 4: \qty{5}{\euro}\\
Line 5: \qty{5}{\texteuro}\\
Line 6: \qty{5}{\myeuro}\\
Line 7: \qty{5}{\myeuroo}\\
Line 8: \qty{5}{\myeurooo}\\
\end{document}

Best Answer

\documentclass{article}
\usepackage{eurosym,textcomp,siunitx}
\DeclareSIUnit{\myeuro}{\text{€}}
\DeclareSIUnit{\myeuroo}{\text{\euro}}
\DeclareSIUnit{\myeurooo}{\text{\texteuro}}
\begin{document}
Line 1: \qty{5}{\myeuro}\\
Line 2: \qty{5}{\myeuroo}\\
Line 3: \qty{5}{\myeurooo}\\
\end{document}

Related Solutions

[Tex/LaTex] Latest advice on the euro symbol

The unicode symbol € does work, if you use a modern font that contains that symbol. :-)

The best practice is to use right symbol for right font. For Computer Modern fonts, eurosym is OK, or textcomp (using fonts provided by CM-super). See this FAQ for more packages:

http://www.tex.ac.uk/cgi-bin/texfaq2html?label=euro

I suggest Latin Modern fonts (using lmodern together with textcomp package), which is similar to Computer Modern. So you can use:

\documentclass{article}
\usepackage[utf8x]{inputenc}
\usepackage{lmodern,textcomp}
\begin{document}
€100
\end{document}

There are still some other font packages with euro symbol. If you use such font themes, use the euro symbol provided by the font package. For example, libertine, fourier and mathdesign package. Thus you can also use:

\documentclass{article}
\usepackage[utf8x]{inputenc}
\usepackage{libertine} % or \usepackage{fourier} or \usepackage[utopia]{mathdesign}
\begin{document}
€100 % or \texteuro100
\end{document}

Using XeLaTeX, most modern OpenType/TrueType fonts have euro symbols, including default Latin Modern fonts. You can use them directly:

% xelatex
\documentclass{article}
\usepackage{fontspec}% Latin Modern by default
% or \setmainfont{Whatever you want}
\begin{document}
€100
\end{document}

Why I can’t use \unit command in siunitx

If you have version 2, then \unit is not available and the older name is \si. As I've mentioned in my blog, you can move to the newer interfaces and cover both v2 and v3 by ensuring that the newer names are available

\ifdefined\qty\else
  \ifdefined\NewCommandCopy
    \NewCommandCopy\qty\SI
  \else
    \NewDocumentCommand\qty{O{}mm}{\SI[#1]{#2}{#3}}
  \fi
\fi
\ifdefined\unit\else
  \ifdefined\NewCommandCopy
    \NewCommandCopy\unit\si
  \else
    \NewDocumentCommand\unit{O{}m}{\si[#1]{#2}}
  \fi
\fi

Best Answer

Related Solutions

[Tex/LaTex] Latest advice on the euro symbol

Why I can’t use \unit command in siunitx

Related Question