Fix subscript and superscript position by command

Question

I have been using the following \subsup command

\newcommand{\subsup}{
\makeatletter
\AtBeginDocument{
\check@mathfonts
\fontdimen16\textfont2=2.5pt
\fontdimen17\textfont2=2.5pt
\fontdimen14\textfont2=4.5pt
\fontdimen13\textfont2=4.5pt}
\makeatother}

in order to change the default positions of subscripts and superscripts in math mode. I used the \subsup command when needed and I was compiling with MikTex.

\documentclass{article}
\usepackage{amsmath}
\usepackage[lite]{mtpro2}

\newcommand{\subsup}{
\makeatletter
\AtBeginDocument{
\check@mathfonts
\fontdimen16\textfont2=2.5pt
\fontdimen17\textfont2=2.5pt
\fontdimen14\textfont2=4.5pt
\fontdimen13\textfont2=4.5pt}
\makeatother}

\subsup
\begin{document}
\[ x_A \]
\end{document}

When I switched to TexLive I got the following errors

Package amsmath Error: \check allowed only in math mode. \begin{document} Font \nullfont has only 7 fontdimen parameters. \begin{document}

In order to fix that I had to call the same code without the \subsup command, just placed right before \begin{document}

\documentclass{article}
\usepackage{amsmath}
\usepackage[lite]{mtpro2}

\makeatletter
\AtBeginDocument{
\check@mathfonts
\fontdimen16\textfont2=2.5pt
\fontdimen17\textfont2=2.5pt
\fontdimen14\textfont2=4.5pt
\fontdimen13\textfont2=4.5pt}
\makeatother
\begin{document}
\[ x_A \]
\end{document}

Is there another simple way to use this code by command?

Please give us a complete example that shows how you're using the command. — Teepeemm
– Teepeemm, Commented Nov 23, 2019 at 13:47
any differences in tex errors will be due to using different latex release or different packages, not due to using texlive rather than miktex — David Carlisle
– David Carlisle, Commented Nov 23, 2019 at 14:05

David Carlisle · Accepted Answer · 2019-11-23 14:09:18Z

5

You have the catcode change in the wrong place, \makeatletter does nothing here

\newcommand{\subsup}{
\makeatletter
\AtBeginDocument{
\check@mathfonts
\fontdimen16\textfont2=2.5pt
\fontdimen17\textfont2=2.5pt
\fontdimen14\textfont2=4.5pt
\fontdimen13\textfont2=4.5pt}
\makeatother}

you want

\makeatletter
\newcommand{\subsup}{
\AtBeginDocument{
\check@mathfonts
\fontdimen16\textfont2=2.5pt
\fontdimen17\textfont2=2.5pt
\fontdimen14\textfont2=4.5pt
\fontdimen13\textfont2=4.5pt}
}
\makeatother

answered Nov 23, 2019 at 14:09

David Carlisle

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