Toggle different math fonts with XeLaTeX

Question

My goal is to use a sans serif math font in all figures and I found several approaches with my favourite being the use of \mathversion and the unicode-math package to change between different math fonts. However, I am not able to switch between fonts due to the warning

Package fontspec Warning: Font "Latin Modern Math" does not contain requested (fontspec) Script "Math".

that repeats for all fonts I import with a [version=] parameter. However, I can change the math font for the whole document.

So my question: What am I doing wrong? I basically copied my code from another answer (will add the link when I find it again).

My mwe for testing is

\documentclass[authoryear,preprint,5p,11pt]{scrartcl}
\usepackage{amsmath}
\usepackage{pgfplots}

\usepackage{fontspec}
\usepackage[]{unicode-math}
\defaultfontfeatures{ Scale=MatchLowercase, Ligatures=TeX }
\setmathfont{XITS Math}
\setmathfont{Latin Modern Math}[version=lm]
\setmathfont{TeX Gyre Pagella Math}[version=pagella]

\begin{document}
This is some text.

And a figure with maths elements
\begin{figure}[ht]
  % \mathversion{sansmath}
 \begin{pgfpicture}
 \pgftext[x=0.691229in,y=0.540666in,,top]{\sffamily\selectfont 125}%
 \pgftext[x=0.354158in,y=0.432447in,left,base]{\sffamily\selectfont \(\displaystyle \frac{-\pi}{2}\)}%
 \pgftext[x=1.054158in,y=0.432447in,left,base]{\sffamily\selectfont \(\displaystyle 10^{3123x} \cdot 12389\)}%
 \end{pgfpicture}
\end{figure}
and a formula
\[ \frac{\pi}{2.42132}= \beta\]
 and some math in another font
\mathversion{lm}
\[ \frac{\pi}{2.42132}= \beta\]
 and yet another one
\mathversion{pagella}
 \[\frac{123456} {some text}\]

\end{document}

The full logfile is here: https://pastebin.com/kS3quC7A

Answer 1

Your log shows that xelatex is finding mathjax fonts:

LatinModernMathJax_Size1-Regular/OT and similar for Pagella: GyrePagellaMathJax_Symbols-Regular/OT and these fonts confuses it.

Try if it works if you use filenames like latinmodern-math.otf instead of the font names.

Answer 2

The only OpenType sans serif math font I know of is GFS Neohellenic Math.

\documentclass{article}
\usepackage{amsmath}

\usepackage{fontspec}
\usepackage[]{unicode-math}

\setsansfont{GFSNeohellenic}[
  Extension=.otf,
  UprightFont=*,
  ItalicFont=*It,
  BoldFont=*Bold,
  BoldItalicFont=*BoldIt,
]
\setmathfont{Latin Modern Math}
\setmathfont{GFSNeohellenicMath.otf}[version=sansmath]

\begin{document}
This is some text.

And a figure with maths elements

\begin{figure}[ht]
\centering
\sffamily\mathversion{sansmath}

\[
125+\frac{-\pi}{2}+10^{3123x} \cdot 12389+\sin3
\]

\caption{Whatever}

\end{figure}

and a formula
\[ \frac{\pi}{2.42132}= \beta\]

\end{document}