From: Aditya Mahajan <adityam@umich.edu>
To: "ntg-context@ntg.nl >> mailing list for ConTeXt users"
<ntg-context@ntg.nl>
Subject: Re: Bug when mathmatrix is used inside mathalign
Date: Wed, 27 Mar 2019 19:09:14 -0400 (EDT) [thread overview]
Message-ID: <nycvar.YAK.7.76.44.1903271900450.7970@nqv-guvaxcnq> (raw)
In-Reply-To: <80bdf3d3-e4cf-8332-ce67-1a3d355d5a18@xs4all.nl>
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On Wed, 27 Mar 2019, Hans Hagen wrote:
> On 3/27/2019 4:56 PM, Aditya Mahajan wrote:
>> Hi,
>>
>> It was reported on TeX.SE[1] that there is a bug when math matrix is used
>> inside a math align:
>>
>> \starttext
>> \startformula
>> \startalign[n=2,align={right,left}]
>> \NC x
>> \NC = a ~ long ~ sequence ~ of ~ terms
>> \NR
>> \NC y
>> \NC = ok ~ left
>> \NR
>> \NC \startmatrix[left={\left\lbrack},right={\right\rbrack}]
>> \NC x \NR
>> \NC y \NR
>> \stopmatrix
>> \NC = why ~ right?
>> \NR
>> \NC y
>> \NC = ok ~ left ~ again
>> \NR
>> \stopalign
>> \stopformula
>> \stoptext
>>
>> gives
>>
>> https://i.stack.imgur.com/ZTAp3.png
>>
>> It appears that \startmatrix globally resets \NC. I haven't looked into
>> the code yet to see why this is happening.
> you can play with
>
> \unprotect
>
> \newcount\c_math_eqalign_column_saved
> \newcount\c_math_eqalign_first_saved
>
> \unexpanded\def\math_matrix_start#1%
> {\begingroup
> \c_math_eqalign_column_saved\c_math_eqalign_column
> \c_math_eqalign_first_saved \c_math_eqalign_first
> \edef\currentmathmatrix{#1}%
> \dosingleempty\math_matrix_start_indeed}
>
> \def\math_matrix_stop
> {\math_matrix_stop_processing
> \global\c_math_eqalign_column\c_math_eqalign_column_saved
> \global\c_math_eqalign_first\c_math_eqalign_first_saved
> \endgroup}
>
> \protect
Yes, this works. But we still need \globalpushmacro\c_math_matrix_first,
otherwise nested matrices have wrong distance.
https://mailman.ntg.nl/pipermail/ntg-context/2017/089631.html
So, the following appears to work correctly:
\unprotect
\newcount\c_math_eqalign_column_saved
\newcount\c_math_eqalign_first_saved
\unexpanded\def\math_matrix_start#1%
{\begingroup
\globalpushmacro\c_math_matrix_first
\c_math_eqalign_column_saved\c_math_eqalign_column
\c_math_eqalign_first_saved \c_math_eqalign_first
\edef\currentmathmatrix{#1}%
\dosingleempty\math_matrix_start_indeed}
\def\math_matrix_stop
{\math_matrix_stop_processing
\global\c_math_eqalign_column\c_math_eqalign_column_saved
\global\c_math_eqalign_first\c_math_eqalign_first_saved
\globalpopmacro\c_math_matrix_first
\endgroup}
\protect
I am not sure why the assignments in math_matrix_start are not global but
those in math_matrix_stop are global.
Aditya
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prev parent reply other threads:[~2019-03-27 23:09 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-27 15:56 Aditya Mahajan
2019-03-27 17:13 ` Hans Hagen
2019-03-27 17:13 ` Hans Hagen
2019-03-27 23:09 ` Aditya Mahajan [this message]
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