[NTG-context] Re: Strange extra space when using cases in an inner align in math

[Gerion Entrup <gerion.entrup@flump.de>]

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Hi Mikael,

your examples are simpler, that is correct, but all of them have the extra space.
Thanks for the simpler code, I will integrate it!

Gerion

Am Dienstag, 20. August 2024, 12:41:45 MESZ schrieb Mikael Sundqvist:
> Hi,
> 
> There is indeed a space added in this case. But you do not need n=3.
> And in fact, you do not need a simplealign either, but can use an
> ordinary align, with location=packed. It looks like you had the wrong
> number of \NC. I hope the examples below help, the last one is merely
> for Hans for looking into why the relation-digit space is added there.
> 
> /Mikael
> 
> \definemathsimplealign[inneralign]
> 
> \showglyphs
> \showboxes
> 
> \showmakeup[mathglue]
> 
> \startdocument
> 
> OK with \typ {n=2} instead of \typ {n=3}:
> 
> \startformula
>   \startalign
>     \NC a = b \NC \NR
>     \NC       \NC \startinneralign[n=2,align={1:right,2:left}]
>                     \NC A      \NC = B \NR
>                     \NC f(x,y) \NC = \startcases
>                                        \NC 1 \NC a \NR
>                                        \NC 1 \NC b \NR
>                                        \NC 1 \NC b \NR
>                                      \stopcases
>                                        \NR
>                   \stopinneralign
>                   \NR
>   \stopalign
> \stopformula
> 
> With align and location set to packed, instead of simplealign
> 
> \startformula
>   \startalign
>     \NC a = b \NC \NR
>     \NC       \NC \startalign[n=2,location=packed,align={1:right,2:left}]
>                     \NC A      \NC = B \NR
>                     \NC f(x,y) \NC = \startcases
>                                        \NC 1 \NC a \NR
>                                        \NC 1 \NC b \NR
>                                        \NC 1 \NC b \NR
>                                      \stopcases
>                                        \NR
>                   \stopalign
>                   \NR
>   \stopalign
> \stopformula
> 
> Extra \typ {reldig} space before the 1:
> 
> \startformula
> \startalign[n=3,location=packed,align={1:right,2:middle,2:left}]
>                     \NC A      \NC = \NC B \NR
>                     \NC f(x,y) \NC = \NC \startcases
>                                            \NC 1 \NC a \NR
>                                            \NC 2 \NC b \NR
>                                          \stopcases
>                                            \NR
> \stopalign
> \stopformula
> 
> \stopdocument
> 
> On Tue, Aug 20, 2024 at 11:55 AM Gerion Entrup <gerion.entrup@flump.de> wrote:
> >
> > Hi,
> >
> > I currently have the case of a strange extra space in math mode when using cases in inner align.
> >
> > Here is a MWE to demonstrate the problem:
> > ```
> > \definemathsimplealign[inneralign]
> > \startdocument
> > \startformula
> >         \startalign
> >                 \NC a = b \NR
> >                 \NC \NC \startinneralign[n=3,align={1:right,2:middle,3:left}]
> >                         \NC A \NC = \NC B \NR
> >                         \NC f(x,y) \NC = \NC \startcases
> >                                  \NC \text{strange}  \NC a \NR
> >                                  \NC \text{normal}  \NC b \NR
> >                                  \NC \text{also normal}  \NC b \NR
> >                         \stopcases
> >                 \stopinneralign
> >         \stopalign
> > \stopformula
> > \stopdocument
> > ```
> >
> > "strange" and "normal" are not aligned what I would expect but strange has more space in front of it.
> > Is this a usage error or a bug in the math engine?
> >
> > Best,
> > Gerion___________________________________________________________________________________


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