Re: [NTG-context] Problem with chemistry in display mode

10 Oct 2007


      The fix works. Thanks a lot!

shenchen

On 10/10/07 1:59 AM, "Aditya Mahajan"  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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