How to write Arabic subscript in XeLaTeX?

Question

I mean like in English such as in V_s

 \documentclass{article}
 \usepackage{circuitikz}
 \begin{document}
 \begin{circuitikz}[american]
 \draw (0,0) to[V,v=$V_s$,invert] (0,2);
 \end{circuitikz}
 \end{document}

I mean the letter and the subscript of it are both in Arabic.

Answer 1

I think you have two problems there

1. the need to type in two scripts at once, which is not really a problem with XeLaTeX
2. the need to typeset a math-version of the arabic font, which can be circumvented by simply using amsmath's \text{}.

\documentclass{article}
\usepackage{circuitikz}
\usepackage{amsmath}
\usepackage{polyglossia}
%pick a font that has knows arabic
\setotherlanguage{arabic}
\newfontfamily\arabicfont[Script=Arabic]{Times New Roman}
\def\matharabic#1{\ensuremath{\text{\begin{Arabic}#1‎\end{Arabic}}}}
 \begin{document}
 \begin{circuitikz}[american]
 \draw (0,0) to[V,v=${}_\matharabic{عَفْواً}\matharabic{شُكْراً}_\matharabic{عَفْواً}$,invert] (0,2);
 \end{circuitikz}
 \end{document}