\to broken in figure captions

\to broken in figure captions

[Sanjoy Mahajan]

In inline math, \to works fine (produces a right arrow), but in a figure
caption all hell breaks loose.

The culprit may be this redefinition of \to in enco-ini.tex:

  $ find texmf -name '*.tex' |xargs egrep -n '\\((e|g|)def|let)\\to\b'
  texmf/tex/context/base/core-pos.tex:642:  %\edef\to  {\POSprefix#1}%
  texmf/tex/context/base/enco-ini.tex:1565:  {\appendtoks\let\to\everylowercase
  texmf/tex/context/base/enco-ini.tex:1570:  {\appendtoks\let\to\everyuppercase

[context : ver: 2006.04.17 23:14]

This test file:

\starttext
\placefigure[abc]{ABC $n\to1$.}{} \input tufte
\stoptext

produces lots of errors beginning with

ERROR: Missing control sequence inserted.

--- TeX said ---
<inserted text> 
                \inaccessible 
<to be read again> 
                   1
\convertargument #1\to #2->\dodoglobal \edef #2
                                               {\detokenize {#1}}
<argument> ABC $n\to 1
                      $.
\docompletefloat ... \doglobal \convertargument #6
                                                  \to \asciititle \ifnofloat...
<argument> ...abc}{figure}{ABC $n\to 1$.}\nextbox 
                                                  \else \docompletefloat {fi...
...
l.2 \placefigure[abc]{ABC $n\to1$.}{}
                                      \input tufte

Re: \to broken in figure captions

[Aditya Mahajan]

On Wed, 26 Apr 2006, Sanjoy Mahajan wrote:

> In inline math, \to works fine (produces a right arrow), but in a figure
> caption all hell breaks loose.
>
> The culprit may be this redefinition of \to in enco-ini.tex:
>
>  $ find texmf -name '*.tex' |xargs egrep -n '\\((e|g|)def|let)\\to\b'
>  texmf/tex/context/base/core-pos.tex:642:  %\edef\to  {\POSprefix#1}%
>  texmf/tex/context/base/enco-ini.tex:1565:  {\appendtoks\let\to\everylowercase
>  texmf/tex/context/base/enco-ini.tex:1570:  {\appendtoks\let\to\everyuppercase
>
> [context : ver: 2006.04.17 23:14]
>
> This test file:
>
> \starttext
> \placefigure[abc]{ABC $n\to1$.}{} \input tufte
> \stoptext
>
> produces lots of errors beginning with
> [snip]

Replacing $...$ with \mathematics{...} works without errors.

Aditya

-- 
Aditya Mahajan, EECS Systems, University of Michigan
http://www.eecs.umich.edu/~adityam || Ph: 7342624008

Re: \to broken in figure captions

[Sanjoy Mahajan]

From:    Aditya Mahajan <adityam@umich.edu>
> Replacing $...$ with \mathematics{...} works without errors.

Good suggestion -- also works here.  

Shouldn't $...$ be equivalent to \mathematics{...}?

$$...$$ is deprecated relative to \startformula...\stopformula, so I
wrote a Python script to convert the plain TeX form to the
ConTexT-preferred form.  However, I like $...$: It's compact and
reading the source file is almost as easy as reading the printed file.
With \mathematics scattered throughout the paragraphs it wouldn't be
so easy, plus I'd have to convince Emacs to fontify the argument of
\mathematics, whereas it already does that for $...$.

-Sanjoy

`Never underestimate the evil of which men of power are capable.'
         --Bertrand Russell, _War Crimes in Vietnam_, chapter 1.

Re: \to broken in figure captions

[Sanjoy Mahajan]

From:    Hans Hagen <pragma@wxs.nl>, Thu, 27 Apr 2006 16:35:47 +0200
> Sanjoy Mahajan wrote:
> > A workaround:
> >
> > \starttext
> > \def\myto{\to}
> > \placefigure[abc]{ABC $n\myto1$.}{} \input tufte
> > \stoptext
> >   
> i need to change the \convertargument#1\to#2 macro so for the
> moment, use this solution or add {} as in

Not sure if that change was intended to be part of the new releases
and got lost in the post-Bachotex craziness, so this email is just a
reminder about it.  Meanwhile I'm using the workaround with no
problems.

-Sanjoy

`Never underestimate the evil of which men of power are capable.'
         --Bertrand Russell, _War Crimes in Vietnam_, chapter 1.

Re: \to broken in figure captions

[Hans Hagen]

Sanjoy Mahajan wrote:
> A workaround:
>
> \starttext
> \def\myto{\to}
> \placefigure[abc]{ABC $n\myto1$.}{} \input tufte
> \stoptext
>   
i need to change the \convertargument#1\to#2 macro so for the moment, use this solution or add {} as in 

\placefigure[abc]{{ABC $n\to1$.}}{} \input tufte


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\to broken in figure captions

[Sanjoy Mahajan]

A workaround:

\starttext
\def\myto{\to}
\placefigure[abc]{ABC $n\myto1$.}{} \input tufte
\stoptext