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Jacques Gélinas on Fri, 15 Nov 2019 16:52:00 +0100
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List of polynomial coefficients in GP
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- To: "pari-users@pari.math.u-bordeaux.fr" <pari-users@pari.math.u-bordeaux.fr>
- Subject: List of polynomial coefficients in GP
- From: Jacques Gélinas <jacquesg00@hotmail.com>
- Date: Fri, 15 Nov 2019 15:51:54 +0000
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- Thread-topic: List of polynomial coefficients in GP
Is there a direct way to get the list of coefficients of a polynomial in GP ?
Consider for example a polynomial with parameter P (representing Pi) in its coefficients:
Vec(subst(1*u+2*P-6,u,x+3)) == [1, 2*P - 3]
is what I want, but this fails in
Vec(subst(0*u+2*P-6,u,x+3)) == [2, -6]
so I must use
cofs(p,v='x) = vector(1+max(0,poldegree(p,v)),k,polcoeff(p,k-1,v));
to get
cofs(subst(0*u+2*P-6,u,x+3),u) == [2*P - 6]
Any suggestions for a simpler solution ?
Jacques Gélinas