Calculate the sum of a Vector times coefficients expressed as two strings.
Normal representation [ a b c ], [ p1 p2 p3 ], [ m1 m2 m3 ]
sum = a(p1-m1)+b(p2-m2)+c*(p3-m3)
sum=9a+4b-3c+2d-6e-8f would be for v=[a b c d e f]
Given v=[1 2 3 4 5 6]
This initial solution proposed to minimize size was utilized by Tim.