Hi everyone,
I’m working on creating a horizontal line within a math align environment that
spans the entire equation, rather than being restricted by the columns. My
current "solution" is to use `\hl`, as shown below:
```
\startformula
\startalign
\NC a + b \NC = c \NR
\NC d + e \NC = f \NR
\NC \hl[4]\NC \hl[4] \NR
\NC g + h \NC = i \NR
\stopalign
\stopformula
```
While this somewhat works, it’s not exactly what I’m aiming for. I need the
line to extend across the full width of the equation. My final goal is
something like this:
\startformula
\startalign[n=11]
\NC \NC 1001 \NC \rightarrow \NC 1000 \NC + \NC 000 \NC + \NC 00 \NC + \NC 1
\NR
\NC + \NC 100 \NC \rightarrow \NC \NC \NC 100 \NC + \NC 00 \NC + \NC 0
\NR
% here should be a horizontal line
\NC \NC \NC \rightarrow \NC 1000 \NC + \NC 100 \NC + \NC 00 \NC + \NC 1
\NR
\NC \NC \NC \rightarrow \NC 1101 \NC \NC \NC \NC \NC \NC
\NR
% here should be a horizontal line
\NC = \NC 1101 \NC \NC \NC \NC \NC \NC \NC \NC
\NR
\stopalign
\stopformula
The horizontal line should not take the height of a hole line.
I also considered using `\underline{}`, but it wont span across multiple
columns. I’ve heard of `\noalign`, but I couldn’t find any helpful resources on
it, and my attempts to use it were unsuccessful.
In LaTeX, the desired outcome would be something like this:
```
\begin{equation*}
\begin{split}
x &= 1 \\
y &= 2 \\
\hline
x + y &= 3
\end{split}
\end{equation*}
```
Does anyone have suggestions for achieving this effect in ConTeXt?
Thank you in advance for your help!
Best regards,
Niklas von Hirschfeld
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