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.ent...@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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