Math align not working

Math align not working

[Johann Birnick]

Hi there,

I noticed that Math align is not working properly. In particular I mean the
alignment. For example, the following code


\starttext                                                                     

\startformula \startalign[m=2,distance=8em,n=5,
align={right,middle,middle,middle,left}]
\NC 0 \NC < \NC 2x + 5y \NC < \NC 10
\NC 4 \NC < \NC 3x + y \NC < \NC 9 \NR
\NC 3 \NC < \NC 2y + 3z \NC < \NC 15
\NC 10\NC < \NC 8y + 5z \NC < \NC 20 \NR
\stopalign \stopformula

\stoptext


is copied from https://dl.contextgarden.net/myway/mathalign.pdf but doesn't
produce the intended result.

What's wrong?

Best regards,
Johann

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Re: Math align not working

[Otared Kavian]

Hi Johann,

The example you sent works fine here with LMTX version 2020.12.28 01:41.
Which version of ConTeXt are you using ?

Best regards: Otared

> On 29 Dec 2020, at 14:36, Johann Birnick <johann.birnick@hotmail.de> wrote:
> 
> Hi there,
> 
> I noticed that Math align is not working properly. In particular I mean the
> alignment. For example, the following code
> 
> 
> \starttext                                                                     
> 
> \startformula \startalign[m=2,distance=8em,n=5,
> align={right,middle,middle,middle,left}]
> \NC 0 \NC < \NC 2x + 5y \NC < \NC 10
> \NC 4 \NC < \NC 3x + y \NC < \NC 9 \NR
> \NC 3 \NC < \NC 2y + 3z \NC < \NC 15
> \NC 10\NC < \NC 8y + 5z \NC < \NC 20 \NR
> \stopalign \stopformula
> 
> \stoptext
> 
> 
> is copied from https://dl.contextgarden.net/myway/mathalign.pdf but doesn't
> produce the intended result.
> 
> What's wrong?
> 
> Best regards,
> Johann
> 
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

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Re: Math align not working

[Johann Birnick]

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Hi Otared,

I'm using the same version. The problem is the "right"-alignment. See the 4 on
the right side. It should be right-aligned. I attached my pdf.

Best regards,
Johann


On Tue, 2020-12-29 at 21:37 +0100, Otared Kavian wrote:
> Hi Johann,
> 
> The example you sent works fine here with LMTX version 2020.12.28 01:41.
> Which version of ConTeXt are you using ?
> 
> Best regards: Otared
> 
> > On 29 Dec 2020, at 14:36, Johann Birnick <johann.birnick@hotmail.de> wrote:
> > 
> > Hi there,
> > 
> > I noticed that Math align is not working properly. In particular I mean the
> > alignment. For example, the following code
> > 
> > 
> > \starttext                                                                  
> >    
> > 
> > \startformula \startalign[m=2,distance=8em,n=5,
> > align={right,middle,middle,middle,left}]
> > \NC 0 \NC < \NC 2x + 5y \NC < \NC 10
> > \NC 4 \NC < \NC 3x + y \NC < \NC 9 \NR
> > \NC 3 \NC < \NC 2y + 3z \NC < \NC 15
> > \NC 10\NC < \NC 8y + 5z \NC < \NC 20 \NR
> > \stopalign \stopformula
> > 
> > \stoptext
> > 
> > 
> > is copied from https://dl.contextgarden.net/myway/mathalign.pdf but doesn't
> > produce the intended result.
> > 
> > What's wrong?
> > 
> > Best regards,
> > Johann
> > 
> > ____________________________________________________________________________
> > _______
> > If your question is of interest to others as well, please add an entry to
> > the Wiki!
> > 
> > maillist : ntg-context@ntg.nl /
> > http://www.ntg.nl/mailman/listinfo/ntg-context
> > webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> > archive  : https://bitbucket.org/phg/context-mirror/commits/
> > wiki     : http://contextgarden.net
> > ____________________________________________________________________________
> > _______
> 
> ______________________________________________________________________________
> _____
> If your question is of interest to others as well, please add an entry to the
> Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ______________________________________________________________________________
> _____

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[-- Attachment #3: Type: text/plain, Size: 493 bytes --]

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Re: Math align not working

[Alain Delmotte]

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Re: Math align not working

[Johann Birnick]

Hi Alain,

I don't know what you mean by "you have two position in the second and one in
the first" ?

The 4 is not aligned correctly. Please see
https://dl.contextgarden.net/myway/mathalign.pdf where the example comes from.
The output looks different.

Best regards,
Johann

On Wed, 2020-12-30 at 11:26 +0100, Alain Delmotte wrote:
> Hi Johann,
> The 4 is right aligned, but for this column you have two position in the
> second and one in the first.
> You could try ~4 and it will align with 10.
> Best regards,
> Alain
> Le 29/12/2020 à 22:27, Johann Birnick a écrit :
> Hi Otared,
> 
> I'm using the same version. The problem is the "right"-alignment. See the 4 on
> the right side. It should be right-aligned. I attached my pdf.
> 
> Best regards,
> Johann
> 
> 
> On Tue, 2020-12-29 at 21:37 +0100, Otared Kavian wrote:
>  
> > Hi Johann,
> > 
> > The example you sent works fine here with LMTX version 2020.12.28 01:41.
> > Which version of ConTeXt are you using ?
> > 
> > Best regards: Otared
> > 
> >  
> > > On 29 Dec 2020, at 14:36, Johann Birnick <johann.birnick@hotmail.de>
> > > wrote:
> > > 
> > > Hi there,
> > > 
> > > I noticed that Math align is not working properly. In particular I mean
> > > the
> > > alignment. For example, the following code
> > > 
> > > 
> > > \starttext                                                                
> > >   
> > >    
> > > 
> > > \startformula \startalign[m=2,distance=8em,n=5,
> > > align={right,middle,middle,middle,left}]
> > > \NC 0 \NC < \NC 2x + 5y \NC < \NC 10
> > > \NC 4 \NC < \NC 3x + y \NC < \NC 9 \NR
> > > \NC 3 \NC < \NC 2y + 3z \NC < \NC 15
> > > \NC 10\NC < \NC 8y + 5z \NC < \NC 20 \NR
> > > \stopalign \stopformula
> > > 
> > > \stoptext
> > > 
> > > 
> > > is copied from https://dl.contextgarden.net/myway/mathalign.pdf but
> > > doesn't
> > > produce the intended result.
> > > 
> > > What's wrong?
> > > 
> > > Best regards,
> > > Johann
> > > 
> > > __________________________________________________________________________
> > > __
> > > _______
> > > If your question is of interest to others as well, please add an entry to
> > > the Wiki!
> > > 
> > > maillist : ntg-context@ntg.nl /
> > > http://www.ntg.nl/mailman/listinfo/ntg-context
> > > webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> > > archive  : https://bitbucket.org/phg/context-mirror/commits/
> > > wiki     : http://contextgarden.net
> > > __________________________________________________________________________
> > > __
> > > _______
> > ____________________________________________________________________________
> > __
> > _____
> > If your question is of interest to others as well, please add an entry to
> > the
> > Wiki!
> > 
> > maillist : ntg-context@ntg.nl /
> > http://www.ntg.nl/mailman/listinfo/ntg-context
> > webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> > archive  : https://bitbucket.org/phg/context-mirror/commits/
> > wiki     : http://contextgarden.net
> > ____________________________________________________________________________
> > __
> > _____
> >  
> >  
> > ____________________________________________________________________________
> > _______
> > If your question is of interest to others as well, please add an entry to
> > the Wiki!
> > 
> > maillist : ntg-context@ntg.nl /
> > http://www.ntg.nl/mailman/listinfo/ntg-context
> > webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> > archive  : https://bitbucket.org/phg/context-mirror/commits/
> > wiki     : http://contextgarden.net
> > ____________________________________________________________________________
> > _______
>   

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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: Math align not working

[Hans Åberg]

One has to indicate the align pattern for all columns, otherwise it defaults to left, it seems:

\starttext

\startformula \startalign[m=2,distance=8em,n=5,
align={right,middle,middle,middle,left,right,middle,middle,middle,left}]
\NC 0 \NC < \NC 2x + 5y \NC < \NC 10
\NC 4 \NC < \NC 3x + y \NC < \NC 9 \NR
\NC 3 \NC < \NC 2y + 3z \NC < \NC 15
\NC 10\NC < \NC 8y + 5z \NC < \NC 20 \NR
\stopalign \stopformula

\stoptext


> On 29 Dec 2020, at 14:36, Johann Birnick <johann.birnick@hotmail.de> wrote:
> 
> Hi there,
> 
> I noticed that Math align is not working properly. In particular I mean the
> alignment. For example, the following code
> 
> 
> \starttext                                                                     
> 
> \startformula \startalign[m=2,distance=8em,n=5,
> align={right,middle,middle,middle,left}]
> \NC 0 \NC < \NC 2x + 5y \NC < \NC 10
> \NC 4 \NC < \NC 3x + y \NC < \NC 9 \NR
> \NC 3 \NC < \NC 2y + 3z \NC < \NC 15
> \NC 10\NC < \NC 8y + 5z \NC < \NC 20 \NR
> \stopalign \stopformula
> 
> \stoptext
> 
> 
> is copied from https://dl.contextgarden.net/myway/mathalign.pdf but doesn't
> produce the intended result.
> 
> What's wrong?
> 
> Best regards,
> Johann
> 
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

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___________________________________________________________________________________

Re: Math align not working

[Johann Birnick]

Okay, but I think it's a bug, because as you see in the linked pdf it worked the
simple way some years ago...


On Wed, 2020-12-30 at 14:38 +0100, Hans Åberg wrote:
> One has to indicate the align pattern for all columns, otherwise it defaults
> to left, it seems:
> 
> \starttext
> 
> \startformula \startalign[m=2,distance=8em,n=5,
> align={right,middle,middle,middle,left,right,middle,middle,middle,left}]
> \NC 0 \NC < \NC 2x + 5y \NC < \NC 10
> \NC 4 \NC < \NC 3x + y \NC < \NC 9 \NR
> \NC 3 \NC < \NC 2y + 3z \NC < \NC 15
> \NC 10\NC < \NC 8y + 5z \NC < \NC 20 \NR
> \stopalign \stopformula
> 
> \stoptext
> 
> 
> > On 29 Dec 2020, at 14:36, Johann Birnick <johann.birnick@hotmail.de> wrote:
> > 
> > Hi there,
> > 
> > I noticed that Math align is not working properly. In particular I mean the
> > alignment. For example, the following code
> > 
> > 
> > \starttext                                                                  
> >    
> > 
> > \startformula \startalign[m=2,distance=8em,n=5,
> > align={right,middle,middle,middle,left}]
> > \NC 0 \NC < \NC 2x + 5y \NC < \NC 10
> > \NC 4 \NC < \NC 3x + y \NC < \NC 9 \NR
> > \NC 3 \NC < \NC 2y + 3z \NC < \NC 15
> > \NC 10\NC < \NC 8y + 5z \NC < \NC 20 \NR
> > \stopalign \stopformula
> > 
> > \stoptext
> > 
> > 
> > is copied from https://dl.contextgarden.net/myway/mathalign.pdf but doesn't
> > produce the intended result.
> > 
> > What's wrong?
> > 
> > Best regards,
> > Johann
> > 
> > ____________________________________________________________________________
> > _______
> > If your question is of interest to others as well, please add an entry to
> > the Wiki!
> > 
> > maillist : ntg-context@ntg.nl /
> > http://www.ntg.nl/mailman/listinfo/ntg-context
> > webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> > archive  : https://bitbucket.org/phg/context-mirror/commits/
> > wiki     : http://contextgarden.net
> > ____________________________________________________________________________
> > _______
> 
> ______________________________________________________________________________
> _____
> If your question is of interest to others as well, please add an entry to the
> Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ______________________________________________________________________________
> _____

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Re: Math align not working

[Hans Åberg]

The developers might tune in; perhaps it was changed.


> On 30 Dec 2020, at 15:01, Johann Birnick <johann.birnick@hotmail.de> wrote:
> 
> Okay, but I think it's a bug, because as you see in the linked pdf it worked the
> simple way some years ago...

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Re: Math align not working

[Aditya Mahajan]

On Wed, 30 Dec 2020, Johann Birnick wrote:

> Okay, but I think it's a bug, because as you see in the linked pdf it worked the
> simple way some years ago...

Yes, something has changed internally. Earlier, if you used:

\startalign[align={right,left}, n=4]
 ...
\stopalign

then the alignment was right left right left, i.e., the alignment cycled. Now, the alignment is right left left left, i.e., unspecified alignments default to left. So, in your example, each column in the second "block" is left aligned. To change that, you can use:

\starttext                                                                     

\startformula \startalign[m=2,distance=8em,n=5,
align={right,middle,middle,middle,left, right,middle,middle,middle,left}]
\NC 0 \NC < \NC 2x + 5y \NC < \NC 10
\NC 4 \NC < \NC 3x + y \NC < \NC 9 \NR
\NC 3 \NC < \NC 2y + 3z \NC < \NC 15
\NC 10\NC < \NC 8y + 5z \NC < \NC 20 \NR
\stopalign \stopformula

\stoptext

But this is ugly. 

I haven't looked at the math alignment code in a while, but I'll check with Hans if the old behavior can be reintroduced. 

Aditya
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Re: Math align not working

[Hans Hagen]

On 1/1/2021 8:21 AM, Aditya Mahajan wrote:
> \startformula \startalign[m=2,distance=8em,n=5,
> align={right,middle,middle,middle,left, right,middle,middle,middle,left}]
> \NC 0 \NC < \NC 2x + 5y \NC < \NC 10
> \NC 4 \NC < \NC 3x + y \NC < \NC 9 \NR
> \NC 3 \NC < \NC 2y + 3z \NC < \NC 15
> \NC 10\NC < \NC 8y + 5z \NC < \NC 20 \NR
> \stopalign \stopformula
> 
> \stoptext


Aditya:

can you check this?

\def\math_build_eqalign
   {\scratchtoks\emptytoks
    \d_math_eqalign_distance\mathalignmentparameter\c!distance\relax
    \scratchcounterone\mathalignmentparameter\c!m
    \scratchcountertwo\mathalignmentparameter\c!n
    \etoksapp\scratchtoks{\the\t_math_align_a}%
    \scratchcounter\plusone
    \dorecurse{\numexpr\scratchcounterone*\scratchcountertwo-\plusone\relax}
      {\ifnum\scratchcounter=\scratchcountertwo
         \scratchcounter\plusone
         \etoksapp\scratchtoks{\math_eqalign_distance}%
         \etoksapp\scratchtoks{\global\c_math_eqalign_column\zerocount}%
       \else
         \advance\scratchcounter\plusone
       \fi
       \etoksapp\scratchtoks{\the\t_math_align_b}}%
    \etoksapp\scratchtoks{\the\t_math_align_c}}


I added:

         \etoksapp\scratchtoks{\global\c_math_eqalign_column\zerocount}%

Hans

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               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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Re: Math align not working

[Aditya Mahajan]

On Fri, 1 Jan 2021, Hans Hagen wrote:

> On 1/1/2021 8:21 AM, Aditya Mahajan wrote:
> > \startformula \startalign[m=2,distance=8em,n=5,
> > align={right,middle,middle,middle,left, right,middle,middle,middle,left}]
> > \NC 0 \NC < \NC 2x + 5y \NC < \NC 10
> > \NC 4 \NC < \NC 3x + y \NC < \NC 9 \NR
> > \NC 3 \NC < \NC 2y + 3z \NC < \NC 15
> > \NC 10\NC < \NC 8y + 5z \NC < \NC 20 \NR
> > \stopalign \stopformula
> > 
> > \stoptext
> 
> 
> Aditya:
> 
> can you check this?
> 
> \def\math_build_eqalign
>   {\scratchtoks\emptytoks
>    \d_math_eqalign_distance\mathalignmentparameter\c!distance\relax
>    \scratchcounterone\mathalignmentparameter\c!m
>    \scratchcountertwo\mathalignmentparameter\c!n
>    \etoksapp\scratchtoks{\the\t_math_align_a}%
>    \scratchcounter\plusone
>    \dorecurse{\numexpr\scratchcounterone*\scratchcountertwo-\plusone\relax}
>      {\ifnum\scratchcounter=\scratchcountertwo
>         \scratchcounter\plusone
>         \etoksapp\scratchtoks{\math_eqalign_distance}%
>         \etoksapp\scratchtoks{\global\c_math_eqalign_column\zerocount}%
>       \else
>         \advance\scratchcounter\plusone
>       \fi
>       \etoksapp\scratchtoks{\the\t_math_align_b}}%
>    \etoksapp\scratchtoks{\the\t_math_align_c}}
> 
> 
> I added:
> 
>         \etoksapp\scratchtoks{\global\c_math_eqalign_column\zerocount}%
> 

This works nicely. Thanks.

I'll also go back to the mathalign document and try to update it for the current LMTX to catch other regressions which might have happened.

Aditya
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Re: Math align not working

[Johann Birnick]

Hi Aditya,

thank you very much, now I need to specify the alignment only for one "column"
and it gets applied for all of them. However, there is still the problem with
the standard setting of the alignment. For example, 

\starttext
\startformula \startalign[m=2, align={right,left}]
\NC ab \NC = cd
\NC efgh \NC = ijkl \NR
\NC efgh \NC = ijkl
\NC ab \NC = cd \NR
\stopalign \stopformula
\stoptext

works now. But the setting [align={right,left}] should be the standard when n is
not set. So (also according to your documentation) the following code 

\starttext
\startformula \startalign[m=2]
\NC ab \NC = cd
\NC efgh \NC = ijkl \NR
\NC efgh \NC = ijkl
\NC ab \NC = cd \NR
\stopalign \stopformula
\stoptext

should work, but it doesn't. The first column is right-oriented, the third (i.e.
the first in the right "column") not.

Could you please fix that?

Thanks you very much,
Johann


On Sat, 2021-01-02 at 02:15 -0500, Aditya Mahajan wrote:
> On Fri, 1 Jan 2021, Hans Hagen wrote:
> 
> > On 1/1/2021 8:21 AM, Aditya Mahajan wrote:
> > > \startformula \startalign[m=2,distance=8em,n=5,
> > > align={right,middle,middle,middle,left, right,middle,middle,middle,left}]
> > > \NC 0 \NC < \NC 2x + 5y \NC < \NC 10
> > > \NC 4 \NC < \NC 3x + y \NC < \NC 9 \NR
> > > \NC 3 \NC < \NC 2y + 3z \NC < \NC 15
> > > \NC 10\NC < \NC 8y + 5z \NC < \NC 20 \NR
> > > \stopalign \stopformula
> > > 
> > > \stoptext
> > 
> > 
> > Aditya:
> > 
> > can you check this?
> > 
> > \def\math_build_eqalign
> >   {\scratchtoks\emptytoks
> >    \d_math_eqalign_distance\mathalignmentparameter\c!distance\relax
> >    \scratchcounterone\mathalignmentparameter\c!m
> >    \scratchcountertwo\mathalignmentparameter\c!n
> >    \etoksapp\scratchtoks{\the\t_math_align_a}%
> >    \scratchcounter\plusone
> >    \dorecurse{\numexpr\scratchcounterone*\scratchcountertwo-\plusone\relax}
> >      {\ifnum\scratchcounter=\scratchcountertwo
> >         \scratchcounter\plusone
> >         \etoksapp\scratchtoks{\math_eqalign_distance}%
> >         \etoksapp\scratchtoks{\global\c_math_eqalign_column\zerocount}%
> >       \else
> >         \advance\scratchcounter\plusone
> >       \fi
> >       \etoksapp\scratchtoks{\the\t_math_align_b}}%
> >    \etoksapp\scratchtoks{\the\t_math_align_c}}
> > 
> > 
> > I added:
> > 
> >         \etoksapp\scratchtoks{\global\c_math_eqalign_column\zerocount}%
> > 
> 
> This works nicely. Thanks.
> 
> I'll also go back to the mathalign document and try to update it for the
> current LMTX to catch other regressions which might have happened.
> 
> Aditya
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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