Fonts & Character Sets ⇒ Small horizontal Bar through Character

[Cham]

How can I print a small horizontal bar on the middle of a letter (symbol) in math mode?

I searched the net but didn't found any yet. Do I need a special package just for this?

Actually, I just need to put a bar through a capital "i".

[localghost]

What you are searching for is the "Latin capital letter I with stroke". It exists as the Unicode character "Ɨ" (U+0197). But this probably needs XeLaTeX.


Thorsten

[Cham]

Well, the capital "i" is oblique in math mode. It should be the same (style and font), but with a bar through it. So your suggestion doesn't do it.

[cgnieder]

How's this:

Code: Select all

\documentclass{article}
\makeatletter
\newcommand\stroke[1]{\mathpalette\stroke@aux{#1}}
\def\stroke@aux#1#2{%
  \ooalign{%
    \hfil$#1-$\hfil\cr
    \hfil$#1#2$\hfil\cr
  }%
}
\makeatother
\newcommand\Istroke{\stroke{I}}
\begin{document}

$\Istroke$

\end{document}

Regards

[Cham]

It's working.

However, I'm not sure anymore that's what I want for my symbol. I need to look out in the litterature what symbol should I use for the radial inertia moment, defined as half the trace of the inertia tensor. Any idea on this ?

[localghost]

[…] I need to look out in the litterature what symbol should I use for the radial inertia moment, defined as half the trace of the inertia tensor. […]

A common symbol for this is a simple capital "I". But I have also seen a "J" and the Greek capital "Θ" (Theta). At least in Germany we use this notation.