Rotated math with correct font size
In these cases it's much easier if you use \text
:
\documentclass{article}
\usepackage{amsmath,graphicx}
\newcommand{\rot}[1]{%
\text{\rotatebox[origin=c]{-90}{$\mathbf{#1}$}}%
}
\begin{document}
$\rot{0}, x_{\rot{0}}$
$\rot{1}, x_{\rot{1}}$
$\rot{8}, x_{\rot{8}}$
\end{document}
This hides \mathpalette
in a user friendly way.
A possible refinement is to do
\newcommand{\rot}[1]{%
\text{%
\setlength{\mathsurround}{0pt}%
\rotatebox[origin=c]{-90}{$\mathbf{#1}$}%
}%
}
in order to be on the safe side if some document class sets the math surround parameter.
It's briefer with
\makeatletter
\newcommand{\rot}[1]{%
\text{\m@th\rotatebox[origin=c]{-90}{$\mathbf{#1}$}}%
}
\makeatother