fontstypewriter
I am using libertine fonts and I would like to change the texttt command to use the cmtt font.
I tried :
\renewcommand{\texttt}[1]{\fontfamily{cmtt}\selectfont{#1}}
but it seems to switch the font for all the text coming after the texttt command. If I type before \texttt{center} after, I want only center to be in cmtt. How to do that ?
You just need to encourage latex to initialise the font setup in scriptstyle as well as the main textstyle. As you notice, it doesn't do this until it thinks it is needed:
\documentclass{minimal}
\usepackage{amsmath}
\newcommand{\ttmath}{%
\everymath{%
{\scriptstyle\mathtt{}}%
{\scriptscriptstyle\mathtt{}}%
\mathtt{\xdef\tmp{\fam\the\fam\relax}\aftergroup\tmp}}}
\newcommand{\val}[1]{\bgroup\ttmath\texttt{#1}\egroup}
\begin{document}
\val{1\ensuremath{\ensuremath{\cdot}10\ensuremath{^{-6}}}}
\ensuremath{a_0}, \ensuremath{m_{\text{e}}}).
\val{1\ensuremath{\ensuremath{\cdot}10\ensuremath{^{-6}}}}
\end{document}
You can update the definition of \ttfamily to include the font changes that you need. For example, below \ttfamily has been updated to always use \LARGE (say). Here is the default definition of \ttfamily from latex.ltx:
\DeclareRobustCommand\ttfamily
{\not@math@alphabet\ttfamily\mathtt
\fontfamily\ttdefault\selectfont}
Here is an updated version in the form of a minimal example:
\documentclass[11pt]{article}
\makeatletter
% Definition of \ttfamily from latex.ltx
\DeclareRobustCommand\ttfamily
{\not@math@alphabet\ttfamily\mathtt
\fontfamily\ttdefault\LARGE\selectfont}
\makeatother
\begin{document}
Some normal text.
{\ttfamily Some typewriter text.\par}
Some normal and \texttt{typewriter} text.
\end{document}
The above example also shows why this should not be done.
Best Answer
If you load the
libertinepackage, doWith other font packages, if they don't provide a suitable option, just do
after having loaded the font package.
Redefining
\textttin the way you tried is wrong.