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A
=
matrix
(
2
,
2
,
[
1
,
2
,
3
,
4
]
)
;
A
A
.
subdivide
(
1
,
1
)
[1 2] [3 4]
A
[1|2] [-+-] [3|4]
show
(
A
)
(
1
2
3
4
)
\displaystyle \left(\begin{array}{r|r} 1 & 2 \\ \hline 3 & 4 \end{array}\right)
(
1
3
2
4
)