Karim Belabas on Fri, 13 Jan 2012 02:48:36 +0100 |
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Re: Main variable of a polynomial? |
* Charles Greathouse [2012-01-13 02:16]: > Suppose I had a variable P which was a polynomial in some unknown > variable. Is there a good way to get that variable in GP? > > I suppose I could take the derivative until it was monic, subtract the > constant term, and divide by pollead. But that hardly seems efficient > when the degree may be large. Not sure I understand the question: what is wrong with variable(P) ? (02:47) gp > P = t^2 + 1 %1 = t^2 + 1 (02:47) gp > variable(P) %2 = t Cheers, K.B. -- Karim Belabas, IMB (UMR 5251) Tel: (+33) (0)5 40 00 26 17 Universite Bordeaux 1 Fax: (+33) (0)5 40 00 69 50 351, cours de la Liberation http://www.math.u-bordeaux1.fr/~belabas/ F-33405 Talence (France) http://pari.math.u-bordeaux1.fr/ [PARI/GP] `