|Bill Allombert on Sat, 16 Nov 2019 19:04:39 +0100|
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|Re: List of polynomial coefficients in GP|
On Fri, Nov 15, 2019 at 05:55:15PM +0000, Jacques Gélinas wrote: > >(Bill Allombert) Fundamentally this is a bug in subst: > > Looks like a feature of Vec, which simplifies its input, and I would not want to change that. > > Vec(Pol(subst(1*u+2*P-6,u,x+3))) == [1, 2*P - 3] > Vec(Pol(subst(0*u+2*P-6,u,x+3))) == [2, -6] Vec does not simplify its input, you are misunderstanding what Pol is doing there (i.e nothing), but you are on the right track! Try Vec(u^0*subst(0*u+2*P-6,u,x+3)) == [2*P-6] Cheers, Bill.