Extract rows or columns of a matrix (Maple compatibility) : row col

### 2.42.14 Extract rows or columns of a matrix (Maple compatibility) : `row col`

`row` (resp `col`) extract one or several rows (resp columns) of a matrix.
`row` (resp `col`) takes 2 arguments : a matrix A, and an integer n or an interval n1..n2.
`row` (resp `col`) returns the row (resp column) of index n of A, or the sequence of rows (resp columns) of index from n1 to n2 of A.
Input :

`row([[1,2,3],[4,5,6],[7,8,9]],1)`

Output :

`[4,5,6]`

Input :

`row([[1,2,3],[4,5,6],[7,8,9]],0..1)`

Output :

`([1,2,3],[4,5,6])`

Input :

`col([[1,2,3],[4,5,6],[7,8,9]],1)`

Output :

`[2,5,8]`

Input :

`col([[1,2,3],[4,5,6],[7,8,9]],0..1)`

Output :

`([1,4,7,[2,5,8])`