FIND_COMPANION _ _ _ _ _ _ _ _ _ _ _ _ operator
<matrix> :- a matrix.
<x> :- the variable.
Given a companion matrix, find_companion finds the polynomial from which it was made.
C := companion(x^4+17*x^3-9*x^2+11,x); [0 0 0 -11] [ ] [1 0 0 0 ] c := [ ] [0 1 0 9 ] [ ] [0 0 1 -17] find_companion(C,x); 4 3 2 x +17*x -9*x +11
Related functions: companion.