### 5.31.2 Rational function given by roots and poles : fcoeff

fcoeff has as argument a vector
whose components are the roots and poles of a rational function
F[x], each one followed by its multiplicity.

fcoeff returns the rational function F(x).

Input :

fcoeff([1,2,0,3,2,-1])

Output :

(x-1)`^`

2*x`^`

3/(x-2)