[v1 v2 ...] fromVectors [s1 s2 ...] array of poly : v1, v2, ... ; poly : s1, s2 .... cf. toVectors. <<e_>> varaible is assumed to be the last variable in x. @@@.esymbol Example: [(x,y) ring_of_differential_operators 0] define_ring [(x). (y).] /ff set [ff ff] fromVectors ::