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

25 Aug 2024

      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  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___________________________________________________________________________________