Matrix _ ZZ -- get a column from a matrix

Matrix _ ZZ -- get a column from a matrix

Synopsis:

Operator: _

Input:

an instance of class Matrix.

an instance of class ZZ.

Output:

an instance of class Vector.

f_i -- provide the i-th column of a matrix f as a vector.

Vectors are disparaged, so we may do away with this function in the future.

See also:

Code:

     -- ../../../Macaulay2/m2/matrix.m2:96-100
     Matrix _ ZZ := Vector => (m,i) -> (
          if 0 <= i and i < numgens source m then (
               sendgg (ggPush m, ggPush i, ggelem);
               new m.target)
          else error ("subscript '", toString i, "' out of range"))