Hans Aberg <mailto:haber...@telia.com>
7. Juli 2015 18:23
On 7 Jul 2015, at 16:47, Wolfgang Schuster<schuster.wolfg...@gmail.com> wrote:
I get errors when using \MC - see example below.
The \NR before \stopmathcases is missing in all your examples.
OK. Though I know it, it is hard to get used to, coming from LaTeX.
But the spacing is wrong: too much between the two components. These are not
cases, but aligned formulas: one might have a number of alignments, not just
one. And I just happen to use left braces on them.
Take a look at my previous example where I changed the distance between both
columns with the distance key.
I missed that. It fixes the spaces within the formula, but adds space between
the two sets relative both TeX and AMS-LaTeX (which has about the same as TeX),
cf. example below.
In AMS-LaTeX one can have more than one alignment, though when trying it
between the “-“ and the “ω” in the second (right-most) set, it adds a lot of
space, rather than just trying to align a compactly as possible. In ConTeXt,
nothing happens with extra alignments; in TeX, there is an error.
So using \startmathcases is a workaround: trying to force it to do something it
wasn’t intended for.
You can set the alignment for each column in a matrix with the align key.
\definemathmatrix
[aligned]
[n=2,
align={right,left},
distance=\spaceamount]
\starttext
\startformula
J^j:
\startaligned[left=\left\{,right=\right.]
\NC ω^0 \NC ↦ 0 \NR
\NC ω^j \NC ↦ 0 \NR
\stopaligned
\quad
\startaligned[n=3,align={right,middle,left},left=\left\{,right=\right.]
\NC ω^k \NC ↦ \NC ω^l \NR
\NC ω^l \NC ↦ \NC -ω^k \NR
\stopaligned
\stopformula
\stoptext
Wolfgang
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