[XeTeX] Size of math font

[Will Robertson]

Hi Nicolas,

Your quotes below are out of order.

On 2009-02-10 09:07:04 +1030, Nicolas Vaughan 
<nivaca at gmail.com> said:

> The other problem this solution bears, is that the font leading remains
> constant while the scale changes.

You can change the leading with \linespread (or with the leading 
package, which I wrote, and which doesn't do anything different than 
\linespread).

> On Mon, Feb 9, 2009 at 5:35 PM, Nicolas Vaughan 
> <nivaca at gmail.com> wrote:
> 
>> Well, I thought one should change somehow the scale of the math font,
>> instead of the main document font...

In fact, it's much easier to change the scaling of the math font than 
the size of the text font in regular LaTeX.

As Ekin wrote there's no generic way to change the scaling of a font 
loaded with regular LaTeX .fd files unless they explicitly support it 
(e.g., the helvet package). And it's very time-consuming/annoying to 
write new .clo files to use a slightly different text font size in your 
document.

However, with math fonts you can explicitly change the scaling with the 
\DeclareMathSizes command, documented in fntguide.pdf:

\documentclass{article}
\usepackage{mathpazo}
\DeclareMathSizes{10}{14}{9}{9}
\begin{document}
a$a^{a^a}$
\end{document}

The first argument is the text size (which is "10" in the example 
because it's a 10pt document), followed by the math size, the script 
size, and the scriptscript size.

Hope this helps,
Will