Re: [NTG-context] Bug with \wordright in LMTX version 2020-08-03 14:25
Fabrice Couvreur schrieb am 05.08.2020 um 19:33:
Hello,
I also use a square to complete a demonstration. I tried this without
success
Thank you
Fabrice
\definesymbol[Fin][\mathematics{\square}]
\def\qed{\strut\wordright{\symbol[Fin]}}
\defineenumeration
[proof]
[...,
closesymbol={\symbol[\qed]}]
1. \symbol is meant to access pre defined symbols, as fallback method
when the requested symbol doesn't exist ConTeXt outputs the argument.
This fallback is in my opinion problematic because it's easy to miss it.
\starttext
\symbol[square]
\symbol[quadrat]
\stoptext
2. When you use the closesymbol for a enumeration ConTeXt uses also the
argument of the closecommand to apply something to the symbol, by
default the argument to the closecommand key is \wordright.
This means you're putting \wordright (which itself is flushed as symbol)
within \wordright which has to fail at some point.
Below is a cleaner version to put a symbol at the end of each proof. The
\blank setting in the \PlaceProofSymbol definition moves the symbol back
in the math formula to avoid the vertical space between them, you can
remove it but I would at leas use \blank[back] to get rid of the empty
line between the formula and the symbol.
\define[1]\PlaceProofSymbol
{\blank[back,overlay]%
\dontleavehmode\wordright{#1}}
\defineenumeration
[proof]
[ closesymbol={\symbol[square]},
closecommand=\PlaceProofSymbol]
\starttext
\startproof
\startformula
a^2 + b^2 = c^2
\stopformula
\stopproof
\stoptext
Wolfgang
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Re: [NTG-context] Bug with \wordright in LMTX version 2020-08-03 14:25
Hello,
I also use a square to complete a demonstration. I tried this without
success
Thank you
Fabrice
\definesymbol[Fin][\mathematics{\square}]
\def\qed{\strut\wordright{\symbol[Fin]}}
\defineenumeration
[proof]
[text=Démonstration,
alternative=serried,
distance=\zeropoint,
number=no,
headstyle=boldslanted,
width=broad,
closesymbol={\symbol[\qed]}]
\starttext
\startproof
\startformula
a^2 + b^2 = c^2
\stopformula
\stopproof
\stoptext
Le mar. 4 août 2020 à 14:02, Otared Kavian a écrit :
> Hi Hans,
>
> Thanks for the hint which consists in adding an \ifmmode to the definition
> of \qed.
> However, as you suggest, one needs some other mechanism in math mode,
> since with your new definition of \qed the alignment of the formula changes
> when one adds this close symbol:
>
> begin-example-qed.tex
> \definesymbol[Fin][\mathematics{\square}]
> \def\qed{\ifmmode\quad\symbol[Fin]\else\strut\wordright{\symbol[Fin]}\fi}
> \starttext
> \startformula
> a^2 + b^2 = c^2.
> \stopformula
> \startformula
> a^2 + b^2 = c^2. \qed
> \stopformula
> One sees that\type{\qed} in the formula changes the alignment of the
> formula. \qed
> \stoptext
> end-example-qed.tex
>
> Thanks a lot for everything: Otared
>
> > On 4 Aug 2020, at 13:24, Hans Hagen wrote:
> >
> > On 8/4/2020 11:17 AM, Otared Kavian wrote:
> >> Thanks Hans for your explanations.
> >> The problem I encountered is that, the command \qed is used dozens of
> time in my text without any issue because it was preceded by something on
> th eline, but the only place where it was alone after a formula resulted in
> the error and it was not easy for me to isolate the issue…
> >> By the way, in mkii it was possible to add \qed on the last line of a
> math formula, but that does not work anymore:
> >> \definesymbol[Fin][\mathematics{\square}]
> >> \def\qed{\strut\wordright{\symbol[Fin]}}
> >> \starttext
> >> \startformula
> >> a^2 + b^2 = c^2. \qed
> >> \stopformula
> >> The above formula does not show the close symbol.\qed
> >> \stoptext
> >> Is there a way to have something like \qed work in math formulas?
> > because that's now hwpo wordright works ...
> >
> > \def\qed{\ifmmode\quad\symbol[Fin]\else\strut\wordright{\symbol[Fin]}\fi}
> >
> > but we probably need something different, something that hooks into
> display math
> >
> > Hans
> >
> >
> > -
> > Hans Hagen | PRAGMA ADE
> > Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> > tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> > -
>
>
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> the Wiki!
>
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>
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Re: [NTG-context] Bug with \wordright in LMTX version 2020-08-03 14:25
Hi Hans,
Thanks for the hint which consists in adding an \ifmmode to the definition of
\qed.
However, as you suggest, one needs some other mechanism in math mode, since
with your new definition of \qed the alignment of the formula changes when one
adds this close symbol:
begin-example-qed.tex
\definesymbol[Fin][\mathematics{\square}]
\def\qed{\ifmmode\quad\symbol[Fin]\else\strut\wordright{\symbol[Fin]}\fi}
\starttext
\startformula
a^2 + b^2 = c^2.
\stopformula
\startformula
a^2 + b^2 = c^2. \qed
\stopformula
One sees that\type{\qed} in the formula changes the alignment of the formula.
\qed
\stoptext
end-example-qed.tex
Thanks a lot for everything: Otared
> On 4 Aug 2020, at 13:24, Hans Hagen wrote:
>
> On 8/4/2020 11:17 AM, Otared Kavian wrote:
>> Thanks Hans for your explanations.
>> The problem I encountered is that, the command \qed is used dozens of time
>> in my text without any issue because it was preceded by something on th
>> eline, but the only place where it was alone after a formula resulted in the
>> error and it was not easy for me to isolate the issue…
>> By the way, in mkii it was possible to add \qed on the last line of a math
>> formula, but that does not work anymore:
>> \definesymbol[Fin][\mathematics{\square}]
>> \def\qed{\strut\wordright{\symbol[Fin]}}
>> \starttext
>> \startformula
>> a^2 + b^2 = c^2. \qed
>> \stopformula
>> The above formula does not show the close symbol.\qed
>> \stoptext
>> Is there a way to have something like \qed work in math formulas?
> because that's now hwpo wordright works ...
>
> \def\qed{\ifmmode\quad\symbol[Fin]\else\strut\wordright{\symbol[Fin]}\fi}
>
> but we probably need something different, something that hooks into display
> math
>
> Hans
>
>
> -
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -
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Re: [NTG-context] Bug with \wordright in LMTX version 2020-08-03 14:25
On 8/3/2020 10:10 PM, Otared Kavian wrote:
Hi Hans,
A file which used to be typeset correctly with the previous versions of lmtx,
now produces an error. Despite the error message being extremely cryptic:
Error ! Missing number, treated as zero
I could guess the origin of the bug, which seems to be \wordright, but
although the following minimal example shows a bug it does not produce the same
ERROR output page:
the square ''end of proof''
\definesymbol[Fin][\mathematics{\square}]
\def\qed{\wordright{\symbol[Fin]}}
\starttext
\startformula
a^2 + b^2 = c^2
\stopformula
\qed % the problem is here
\stoptext
In the above example if one adds something before \qed, then the square
end-of-proof appears.
However in my real file ConTeXt ouputs an error page and says: Error !
Missing number, treated as zero.
One can debate if the old behavior was ok ... wordright is meant for
adding something at the end of a paragraph and you have none here. You
can add a \strut in your definition to force a line.
The lmtx implementation actually permit this:
\definesymbol[Fin][\mathematics{\square}]
\def\qed{\strut\wordright{\symbol[Fin1]}\wordright{\symbol[Fin2]}\wordright{\symbol[Fin3]}}
\starttext
\startformula
a^2 + b^2 = c^2
\stopformula
\qed % the problem is here
\stoptext
i'm still exploring this but it has to do with collecting stuff, as in:
\wordright{before} test \par
test \wordright{before} \par
(i'll look at the number issue which indeed looks a like a bug)
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-
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