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 ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________