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submat

submatrix

Syntax
submat(M:MAT, R:LIST of INT, C:LIST of INT):MAT

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);
matrix([
  [3, 4, 5],
  [13, 14, 15]
])

/**/  M := mat([[1,2,3],[4,5,6]]);
/**/  submat(M,[2],[1,3]);
matrix([
  [4, 6]
])

See Also