M, a matrix, in which each column consists of the coordinates of a point
R, a polynomial ring, coordinate ring of the affine space containing the points
Outputs:
a list, of ring maps corresponding to evaluations at each point
Description
Giving the coordinates of a point in affine space is equivalent to giving a ring map from the polynomial ring to the ground field: evaluation at the point. Given a finite collection of points encoded as the columns of a matrix, this function returns a corresponding list of ring maps.