On Fri, 15 Sep 2006, Hans Hagen wrote:
> Aditya Mahajan wrote:
>> On Thu, 14 Sep 2006, Hans Hagen wrote:
>>
>>
>>> Aditya Mahajan wrote:
>>>
>>>> On Thu, 14 Sep 2006, WN wrote:
>>>>
>>>>
>>>>
>>>>> Hello,
>>>>> I need to use \dddot and \ddddot in one of my documents, does anyone
>>>>> know how to
>>>>> define these math symbols.
>>>>>
>>>>>
>>>> The trouble is that most fonts do not contain these accents.
>>>> amsmath.sty gets over this definition by faking these symbols. It is
>>>> easy to port these definitions to context.
>>>>
>>>> amsmath.sty definition
>>>>
>>>> \newcommand{\dddot}[1]{%
>>>> {\mathop{#1}\limits^{\vbox [EMAIL PROTECTED]@\ex@
>>>> \hbox{\normalfont ...}\vss}}}}
>>>> \newcommand{\ddddot}[1]{%
>>>> {\mathop{#1}\limits^{\vbox [EMAIL PROTECTED]@\ex@
>>>> \hbox{\normalfont....}\vss}}}}
>>>>
>>>>
>>>> Converting to context
>>>>
>>>> %--------------------%<------------------------------------
>>>> \unprotect
>>>>
>>>> % The true copy of amsmath definitions
>>>> \def\amsdddot {\limits^{\vbox to -1.4ex{\kern-2ex\hbox{\the\textfont\z@
>>>> ...}\vss}}}
>>>> \def\amsddddot{\limits^{\vbox to [EMAIL PROTECTED]
>>>>
>>>> % I do not understand why you need to give negative height
>>>>
>>>>
>>> \setbox\scratchbox{..} \ht\scratchbox0pt \dp\scratchbox-2pt
>>>
>>
>> I was wondering why amstex definition does this, as the 1.4ex depth
>> was too big. Then I realized that it is not 1.4ex but 1.4\ex@ with
>> \ex@ as .2326ex. ughh....the ugly syntax of plain tex...
>>
>> So here is a more reliable reproduction of amstex dddot and ddddot
>>
>> \newdimen\amstexex
>>
>> \amstexex = .2326ex
>>
> what's this funny number based on, somehow related to interlinespace?
>
> one cannot define a measure globally this way, since an ex is font
> dependent,;
>
> \def\amstexex{\dimexpr.08\lineheight\relax}
The latex package amsgen.sty define it more carefully
\newdimen\ex@
[EMAIL PROTECTED]@[EMAIL PROTECTED]@[EMAIL PROTECTED]
[EMAIL PROTECTED]@{%
\begingroup
[EMAIL PROTECTED]@size\p@
\ifdim\dimen@<-20\p@
\global\ex@ 1.5\p@
\else
[EMAIL PROTECTED]@ [EMAIL PROTECTED]@
[EMAIL PROTECTED]@>\z@ -\fi}%
\dimen@ \ifdim\dimen@<\z@ -\fi \dimen@
[EMAIL PROTECTED]@m sp % fudge factor
\vfuzz\p@
\def\do{\ifdim\dimen@>\z@
\vfuzz=.97\vfuzz
\advance\dimen@ -\p@
[EMAIL PROTECTED] \fi}%
\do
[EMAIL PROTECTED]@ [EMAIL PROTECTED]
[EMAIL PROTECTED]@
\global\advance\ex@ [EMAIL PROTECTED]@
\fi
\endgroup
}
Aditya
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