fontsize in math

fontsize in math

[Hans van der Meer]

Hi Hans,

I encountered an issue in fontsizing in math mode that I do not 
understand.
Searched the manual but couldn't find (or missed) the clue.

Using the green presentation style but changed to a somewhat larger 
fontsize by adding:
\setupbodyfont[lbr, sans, 17.3pt]	% lucidabright

typesetting the following text:
{abc$abc$abc} --- {\tfx abc$abc$abc} --- {\tfx abc}{$\tfx abc$}{\tfx 
abc}

In the first the abc's have the same size.
In the second the math part has kept its size, the other two are 
smaller.
In the third the math part is now so small is doesn't match in size as 
it did in the first.

I would have thought the math would vary in accordance with the \tfx.
However, within $'s the font does not follow the outside \tfx, while 
inside a different size seems to be chosen. I am baffled.
Can you point in the right direction? Thanks.

Hans van der Meer

Re: fontsize in math

[Hans Hagen]

At 02:14 PM 3/5/2003 +0100, you wrote:
>Hi Hans,
>
>I encountered an issue in fontsizing in math mode that I do not understand.
>Searched the manual but couldn't find (or missed) the clue.
>
>Using the green presentation style but changed to a somewhat larger 
>fontsize by adding:
>\setupbodyfont[lbr, sans, 17.3pt]       % lucidabright
>
>typesetting the following text:
>{abc$abc$abc} --- {\tfx abc$abc$abc} --- {\tfx abc}{$\tfx abc$}{\tfx abc}
>
>In the first the abc's have the same size.
>In the second the math part has kept its size, the other two are smaller.
>In the third the math part is now so small is doesn't match in size as it 
>did in the first.
>
>I would have thought the math would vary in accordance with the \tfx.
>However, within $'s the font does not follow the outside \tfx, while 
>inside a different size seems to be chosen. I am baffled.
>Can you point in the right direction? Thanks.

The x and xx sizes are meant for text purposes, like text super and 
subscripts and pseudo kaps; opposite to a-d sizes that are meant for heads 
and so; as a result, x and xx are fast, a-d are slower due to the fact that 
math is synchronzied (can be turned on/off)

When you want to switch to a smaller/larger bodyfont, you should use

\smallbodyfont == \switchtobodyfont[smallbodyfont]
\bigbodyfont   == ...

This will switch the whole thing (kee pin mind that for math also the two 
smaller super/sub sizes have to be set up). When using typescripts (i.e. 
namespaces font sets with global file resolving) the penalty in terms of 
time is small.

So:

   use \smallbidyfont instead of \tfx in your case

btw, in the third example the second tfx is actually a tfxx, so {text \tfx 
text \tfx text} makes the last one real small; as said, the main reason for 
the x sizes in in super/sub scripts and pseudo kaps (we use those a lot in 
educ docs and these commands also obey the font style)

Hans
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