Example: `M=[1:3,4:6,7:9]`

Then one can reduce M up to one column, e.g.

`M(1..3,2..2)`

But one cannot reduce M up to one row:

`M(2..2,1..3)`

produces an error (“M out of read bounds”). Selecting submatrices should be a symmetric operation, so in my opinion, this is a bug.

PS: Transponing to times is a workaround:

`A=M'`

`A=A(1..3,2..2)`

`M=A'`