preImage(A,v)
Computes the preimage of v under A. If v is not in image A then returns false.
i1 : A=matrix {{1, 0}, {0, 1}, {-1, -1}} o1 = | 1 0 | | 0 1 | | -1 -1 | 3 2 o1 : Matrix ZZ <-- ZZ
i2 : b=vector {-2,2,0} o2 = | -2 | | 2 | | 0 | 3 o2 : ZZ
i3 : v=preImage(A,b) o3 = | -2 | | 2 | 2 o3 : ZZ
i4 : A*v o4 = | -2 | | 2 | | 0 | 3 o4 : ZZ
The object preImage is a method function.