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2.24.20  Coefficients of a polynomial defined by its roots : pcoeff pcoef

pcoeff (or pcoef) takes as argument a list of the roots of a polynomial P.
pcoeff (or pcoef) returns a univariate polynomial having these roots, represented as the list of it’s coefficients by decreasing order.
Input :

pcoef([1,2,0,0,3])

Output :

[1,-6,11,-6,0,0]

i.e. (x−1)(x−2)(x2)(x−3)=x5−6x4+11x3−6x2.


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