From: SourceForge.net <noreply@so...>  20030425 15:35:19

Bugs item #727542, was opened at 20030425 15:35 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=727542&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Martin Rubey (kratt5) Assigned to: Nobody/Anonymous (nobody) Summary: powerseries wrong Initial Comment: (C51) gf:2*(1751144*x4882*x^3+4324*x^42072*x^5+416*x^6+3189*x^2)/ (2*x1)^3/(4*x1)/(x1)^3$ (C52) taylor(gf,x,0,3); 2 3 (D52)/T/ 350 + 2262 x + 11634 x + 53650 x + . . . (C53) taylor(powerseries(gf,x,0),x,0,3); 2 3 (D53)/T/ 470 + 2862 x + 13524 x + 58750 x + . . . maybe this is related to sum(x^i,i,0,inf),x:0 giving 0, but I don't know... I checked D53 with Maple, so it seems that powerseries is wrong, not taylor. I converted the result of powerseries to the rational function again, and obtained: 2*(9407436*x41588*x^322066*x^5+40253*x^4+416*x^81816*x^7+7076*x^6+24227*x^2) /(2*x1)^3/(4*x1)/(x2)^2/(x1)^3 The difference between the two is 160*'SUM((I+1)*2^I*x^I,I,0,INF)160*'SUM((I+1)*2^(I2)*x^I,I,0,INF) so the reason might be a simple typo ( instead of + or the like)... Should be possible to correct this... Martin  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=727542&group_id=4933 