[Tex/LaTex] XeLaTeX/beamer/fontspec/unicode-math: Change font of all math digits

beamerfontsmathspecunicode-mathxetex

Please consider the following MWE:

\documentclass{beamer}
\usepackage{unicode-math}
\usepackage{fontspec}
\setsansfont{some-font.otf}
\usefonttheme[onlymath]{serif}

\begin{document}
    \begin{frame}
        Some text with the number \textit{two} in text mode (2) and math mode ($2$).
        \begin{equation*}
            \vec{s}(t) = \frac{\vec{a}}{2} t^2 + \vec{v}_0 t + \vec{s}_0
        \end{equation*}
    \end{frame}
\end{document}

How to change the font of all math digits to the sans font defined with fontspec's \setsansfont command (font-independent)?

I tried to experiment with the \Umathcode XeTeX primitive as well as with \setmathfont provided by unicode-math, however, I had no success.

I am aware of the package mathspec and its \setmathfont(digits) command, but I realized that the combination of a beamer class document and fontspec/mathspec causes misplaced math elements (see figures 1 and 2 for a comparison; for figure 2, \usepackage{unicode-math} package has been commented out in the MWE).

Figure 1: With <code>unicode-math</code> loaded.
Figure 2: Without <code>unicode-math</code>.

Update:
This MWE compiles without any error in my setup. However, if the line \setmainfont{Arial} is commented out, an error will be thrown. The same is true if I specify a font as a file (*.ttf or *.otf) instead of a system-installed font.

\documentclass{beamer}
\usefonttheme{professionalfonts}
\usepackage{unicode-math}
\usepackage{fontspec}
\setmainfont{Arial}
\setmathfont[range={\mathup}]{Lucida Sans}

\begin{document}
    \begin{frame}
        \begin{equation}
            x = \int\limits_0^\infty f(q) \,\mathrm{d} q
        \end{equation}
    \end{frame}
\end{document}

Best Answer

Disable the font setting of beamer:

\documentclass{beamer}
\usefonttheme{professionalfonts}% use own font handling
\usepackage{unicode-math}
\setmainfont{Lucida Sans}
\setmathfont{XITS Math}
\setmathfont[range={\mathit}]{Lucida Sans Italic}
\setmathfont[range={\mathup}]{Lucida Sans}

\begin{document}
    \begin{frame}
        Some text with the number \textit{two} in text mode (2) and math mode ($2$).
        \begin{equation*}
            \vec{s}(t) = \frac{\vec{a}}{2} t^2 + \vec{v}_0 t + \vec{s}_0
        \end{equation*}
    \end{frame}
\end{document}

output

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