A = size 3 by 3 Matrix of double:
[ 1 2 3 ]
[ 4 5 6 ]
[ 7 8 9 ]

A.row(0) = size 1 by 3 Matrix of double:
[ 1 2 3 ]

A.column(1) = size 3 by 1 Matrix of double:
[ 2 ]
[ 5 ]
[ 8 ]

A.left(2) = size 3 by 2 Matrix of double:
[ 1 2 ]
[ 4 5 ]
[ 7 8 ]

A.window(1,3,1,3) = size 2 by 2 Matrix of double:
[ 5 6 ]
[ 8 9 ]

A.top(2) = size 2 by 3 Matrix of double:
[ 1 2 3 ]
[ 4 5 6 ]

A.top(2).left(2) = size 2 by 2 Matrix of double:
[ 1 2 ]
[ 4 5 ]

A.top(2).left(2) = size 2 by 2 Matrix of double:
[ 1 2 ]
[ 4 0 ]

A = size 3 by 3 Matrix of double:
[ 1 2 3 ]
[ 4 0 6 ]
[ 7 8 9 ]

