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Submat
Syntax
Submat(M:LIST or MAT,R:LIST of INT,C:LIST of INT):MAT
Summary
submatrix
Description
This function returns the submatrix of M formed by the rows listed
in R and the columns listed in C.  If M is a list, it is interpreted
as a matrix in the natural way.

Example

M := Mat([[1,2,3,4,5],[6,7,8,9,10],[11,12,13,14,15]]);
Submat(M,[1,3],3..5);
Mat[
  [3, 4, 5],
  [13, 14, 15]
]
-------------------------------
L := [[1,2,3],[4,5,6]];
Submat(L,[2],[1,3]);
Mat[
  [4, 6]
]
-------------------------------
See also: