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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])

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