sage-support is one of the best list. English is not my mother language and sometimes I don't explain myself well but always people here are very kind and trying to help... It's very important this can long !
Le vendredi 14 septembre 2018 18:00:55 UTC+2, Peter Luschny a écrit : > > How can I speed up this computation? > > H.<i,j,k> = QuaternionAlgebra(SR, -1, -1) > def Q(a, b, c, d): return H(a + b*i + c*j + d*k) > def P(n): return Q(x+1,1,1,1)*P(n-1) if n > 0 else Q(1,0,0,0) > def p(n): return P(n)[0].list() > for n in (0..20): print [n], p(n) > > [0] [1] > [1] [1, 1] > [2] [-2, 2, 1] > [3] [-8, -6, 3, 1] > [4] [-8, -32, -12, 4, 1] > [5] [16, -40, -80, -20, 5, 1] > [6] [64, 96, -120, -160, -30, 6, 1] > ... > > With Mathematica this takes 6 sec, with Sage it takes > hours, (in fact I interrupted after n=15). > > Thanks, Peter > > > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
