Giuseppe,
you may or may not know about these problems already, so I decided to
simply send them all. I'm using t-nath.tex 2003.12.08, updated five
minutes ago from www.tug.org, ConTeXt 2004.6.26, and pdfeTeX
3.14159-1.10b-2.1 (Web2C 7.4.5).
nath seems to have trouble with $$...$$-formulas. This file won't compile:
\usemodule[nath]
\starttext
\placeformula
$$a$$
\stoptext
Error message:
Runaway argument?
\@@dollar {\to \asciiB \ExpandBothAfter \doifincsnameelse \asciiA
\asciiB \ETC.
! File ended while scanning use of \convertargument.
Replacing $$...$$ by \startformula...\stopformula fixes this, but the
following file won't compile either:
\usemodule[nath]
\starttext
\placeformula
\startformula \sum_{i=0}^m a_i\stopformula
\stoptext
The culprit, it seems, is that \inlinemath uses \xdef, but \mathop@@@
puts unexpandable code into the argument of ^ and _. The following
hackery seems to work:
\def\mathop@@@{%
\ifsp@
^{\hbox{\edef\noexpand\!!stringa%
[EMAIL PROTECTED]@toks}}%
\def\noexpand\\{,\ }\noexpand\!!stringa}}
\fi
\ifsb@
_{\hbox{\edef\noexpand\!!stringa%
[EMAIL PROTECTED]@toks}}%
\def\noexpand\\{,\ }\noexpand\!!stringa}}
\fi}
Though I must confess I don't understand why the complexity with
introducing \!!stringa is needed. The following version works for me:
\def\mathop@@@{%
\pushmacro\\
\def\\{\noexpand\text{, }}%
\ifsp@
[EMAIL PROTECTED]
\fi
\ifsb@
[EMAIL PROTECTED]
\fi
\popmacro\\}
Parentheses in display formulas don't work:
\usemodule[nath]
\starttext
\startformula (x) \stopformula
\stoptext
I don't know if at some time ConTeXt placed \the\everymath inside
\everydisplay, but with the current ConTeXt, you need to \appendtoks to
both. I regard the output as broken, but at least it will compile.
Another bug: t-nath.tex defines \savecatcode and \restorecatcode, but
these names have already been used in verb-ini.tex. I have locally
replaced these with \nath!savecatcode and \nath!restorecatcode, seems to
work.
A math problem not related to nath:
\starttext
\setupformulae[align=left]
\startformula
\eqalignno{a&=b\cr c&=d}
\stopformula
\stoptext
doesn't work for me. Anyone else?
Regards,
Christopher Creutzig
PS: I won't be able to read mails in the next four weeks.
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