Salvete,
I finally managed to make t-nath work with \eqalign and \eqalignno. (I assume I was not the only one having trouble there?) As it appears, nath gets really confused when subformulas are enclosed in {} and contain some form of delimiters. Therefore, the original definitions just don't work, but these modifications do, at least in some sense of “work”:
\def\eqalignno#1%
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\tabskip\centering
\vcenter{%
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\halign to \displaywidth
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&[EMAIL PROTECTED] {}##\stopnathdmath}\hfil\tabskip\centering
&[EMAIL PROTECTED]@skip\crcr
#1\crcr}}}\def\eqalign#1%
{\null
\,%
\vcenter
{\openup
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\ialign
{\strut\hfil{\startnathdmath ##\stopnathdmath}&%
{\startnathdmath {}##\stopnathdmath}\hfil\crcr
#1\crcr}}%
\,}And I've got another snippet I'd like to share, which helps displaying continued fractions in a linear format, using the “best” way of doing so I've met so far:
\def\contfrac#1#2{%
% To get the lines at the top right and bottom left
% at the correct lengths, we need to know the final heights
% of both top and bottom. Since styles ``C-up'' and ``C-down''
% are used only in generalized fractions, we need a trial
% typesetting run for this.
\begingroup
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[EMAIL PROTECTED] .7\mex\!!width 0pt
[EMAIL PROTECTED] #1}%
\!!dimena=\ht\nathbox \advance\!!dimena-\ht\sizebox@
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% \!!dimena=\dp\nathbox \advance\!!dimena .5ex \dp\nathbox=\!!dimena
\global\!!dimend=\dp\nathbox
\box\nathbox
\above\fracrulethickness@
[EMAIL PROTECTED] 2\mex\!!width 0pt
[EMAIL PROTECTED] #2}%
\!!dimenb=\dp\nathbox \advance\!!dimenb-\dp\sizebox@
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% \!!dimenb=\ht\nathbox \advance\!!dimenb .5ex \ht\nathbox=\!!dimenb
\global\!!dimene=\ht\nathbox
\box\nathbox
}%
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%
%
%% See the TeXbook, page 444 f., for what is happening here.
\ifcase\mathcount@
\!!dimenf=\fontdimen8\textfont2
\!!dimeng=\fontdimen11\textfont2
\!!dimenh=3\fracrulethickness@
\!!dimeni=\fontdimen22\textfont2
\or
\!!dimenf=\fontdimen9\scriptfont2
\!!dimeng=\fontdimen12\scriptfont2
\!!dimenh=\fracrulethickness@
\!!dimeni=\fontdimen22\scriptfont2
\else
\!!dimenf=\fontdimen9\scriptscriptfont2
\!!dimeng=\fontdimen12\scriptscriptfont2
\!!dimenh=\fracrulethickness@
\!!dimeni=\fontdimen22\scriptscriptfont2
\fi
%
\!!dimenj=\dimexpr(\!!dimenf-\!!dimend)-
(\!!dimeni+0.5\fracrulethickness@)\relax
\ifdim\!!dimenj<\!!dimenh
\advance\!!dimenf by \dimexpr(\!!dimenh-\!!dimenj)\relax
\fi
\!!dimenj=\dimexpr(\!!dimeni-0.5\fracrulethickness@)-
(\!!dimene-\!!dimeng)\relax
\ifdim\!!dimenj<\!!dimenh
\advance\!!dimeng by \dimexpr(\!!dimenh-\!!dimenj)\relax
\fi
%
\advance\!!dimenf by\dimexpr(-\!!dimeni)\relax
\advance\!!dimeng by\dimexpr(+\!!dimeni)\relax
%
\setbox\!!boxa\hbox{%
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[EMAIL PROTECTED] .7\mex\!!width 0pt
[EMAIL PROTECTED] #1}%
\ifdim\ht\nathbox<1.6ex
\ht\nathbox=1.6ex
\fi
\!!dimena=\ht\nathbox \advance\!!dimena-\ht\sizebox@
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\setbox\!!boxb\hbox{%
\vrule
\!!depth\!!dimenf
\!!height\ht\nathbox
\!!width\fracrulethickness@
}%
\dp\!!boxb=0pt
\hfill\,
\box\nathbox
\,\hfill
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\above\fracrulethickness@
[EMAIL PROTECTED] 2\mex\!!width 0pt
[EMAIL PROTECTED] #2}%
\ifdim\dp\nathbox<.4ex
\dp\nathbox=.4ex
\fi
\!!dimenb=\dp\nathbox \advance\!!dimenb-\dp\sizebox@
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\setbox\!!boxb\hbox{%
\vrule
\!!depth\dp\nathbox
\!!height\!!dimeng
\!!width\fracrulethickness@
}%
\ht\!!boxb=0pt
\box\!!boxb\hskip\fracrulethickness@
\hfill\,
\box\nathbox
\,\hfill
}%
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\setbox\nathbox\copy\!!boxa
\iftoprestricted@ \else
\!!dimenb=\ht\nathbox \advance\!!dimenb .4\mex \ht\nathbox=\!!dimenb
\fi
\ifbotrestricted@ \else
\!!dimenb=\dp\nathbox \advance\!!dimenb .5\mex \dp\nathbox=\!!dimenb
\fi
\box\nathbox % print
\!!dimena=\ht\!!boxa \advance\!!dimena-\htdecrement@
\ht\!!boxa=\!!dimena
\!!dimena=\dp\!!boxa \advance\!!dimena-\dpdecrement@
\dp\!!boxa=\!!dimena
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\endgroup
[EMAIL PROTECTED]@}}I do assume the whole thing could be done with about half as many lines of code, but I was glad to finally understand how TeX typesets fractions and just ignored beautifying the code. Also note that the snippet uses \fracrulethickness@ from t-nath.tex, while I honestly consider using \fontdimen8\textfont3 or whichever font size is in use for the fraction. Well, work in progress.
regards,
Christopher Creutzig_______________________________________________ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
