[NTG-context] Problem with chemistry in display mode

Shen Chen ShenChen at nus.edu.sg
Wed Oct 10 04:18:14 CEST 2007


The fix works. Thanks a lot!

shenchen

On 10/10/07 1:59 AM, "Aditya Mahajan" <adityam at umich.edu> wrote:

> On Tue, 9 Oct 2007, Shen Chen wrote:
> 
>> Hi all,
>> 
>> The following example with the chemical module complains that "! Argument of
>> \mtharrowfill has an extra }.".
>> 
>> -----------
>> \usemodule[chemic]
>> \starttext
>> $$ \chemical{2H_2,PLUS,O_2,GIVES,2H_2O} $$
>> \stoptext
>> -----------
>> 
>> The result pdf looks fine, though. The annoying problem only occurs when
>> there's an arrow "GIVES", and only in display mode.
> 
> This error is due to a change that I suggested in math-ext (for over
> and under arrows). I did not check that it breaks ppchtex. Here is a
> fix. Add this somewhere in your style file:
> 
> \def\chemicalsingleouterarrow
>    {\dochemicalouterarrow
>       {\hbox to \dimen2{\rightarrowfill\textstyle}}}
> 
> \def\chemicaldoubleouterarrow
>    {\dochemicalouterarrow
>       {\lower.5\ht0\vbox
>          {\offinterlineskip
>           \hbox to \dimen2{\rightarrowfill\textstyle}
>           \hbox to \dimen2{\leftarrowfill\textstyle}}}}
> 
> \def\chemicaltwintipouterarrow
>    {\dochemicalouterarrow
>       {\hbox
>          {\hbox to \dimen2{\rightarrowfill\textstyle}%
>           \hskip-\dimen2
>           \hbox to \dimen2{\leftarrowfill\textstyle}}}}
> 
> 
> Hans, this should be corrected in ppchtex. There are a few other
> chemistry modules that use arrowfills, which now needs an argument
> specifying the math mode in which arrow should be drawn.
> 
> I will look into it, but I have examples of working chemical
> formulas.
> 
> Aditya
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