Re: Changing font for math function

[Hans Hagen <pragma@wxs.nl>]

On 5/16/2015 2:24 AM, Aditya Mahajan wrote:
> On Sat, 16 May 2015, Maggyero wrote:
>
>>> Aditya Mahajan:
>>> The default should be \mathupright (as is the case in amstex
>> and latex, and probably also plaintex).
>>
>>> Hans Hagen:
>>> next beta: when one of the stylealternatives text mode else mathmode
>>> (default nothing == math upright)
>>
>>> Hans Hagen:
>>>> Because like in \mtext, the \text command is ESSENTIAL (for the
>>>> function
>> names to have the mathcodes, kerning and ligatures of the text mode
>> instead
>> of the ones of the math mode).
>>> that is not needed because if you use a style known as text style a text
>> font is used
>>
>> Alright, but why not ALWAYS use your text style (or my \text), why
>> talking
>> about \mathupright then? \mathupright should never be used to display a
>> name in text style in my opinion. I don't get it, is there something
>> that I
>> missed with that \mathupright? (And I'm not managing to download the new
>> beta of yesterday so I don't have access to the new code yet).
>
> Plaintex, amstex, and latex, all default to using \mathupright (or
> equivalent).
>
> Compare the output of the following:
>
> 1. Plain tex:
> \font\tenrm=ptmr7t at 10pt \tenrm
> log $\log$ log
> \bye
>
> 2. Latex:
> \documentclass{article}
> \usepackage{times} % Only changes the text font
> \begin{document}
> log $\log$ log
> \end{document}
>
> 3. Context:
> \definetypeface[mainfont][rm][serif][times][default]
> \definetypeface[mainfont][mm][math] [modern][default]
> \setupbodyfont[mainfont]
> \starttext
> log $\log$ log
> \stoptext
>
> By default, in all three formats the font for \log is mathupright rather
> than textrm. There needs to be a rationale for ConTeXt default to be
> different from other formats. Do you have any reference to a math book
> or journal that uses text fonts for \log-like operators?

also, this is more robust with respect to mixed font usage: it would 
look weird if inside pagella math suddenly a function name in optima 
would be used when that font is used for the main body text

> If you want you can set \setupmathematics[functionstyle=normal] and
> achieve the behaviour that you want.

indeed

> Aditya
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