From: SourceForge.net <no...@so...> - 2008-01-29 07:07:47
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Bugs item #1879521, was opened at 2008-01-25 01:31 Message generated for change (Comment added) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1879521&group_id=4933 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Tore Gaupseth (toregaupseth) Assigned to: Nobody/Anonymous (nobody) Summary: Sum function fails Initial Comment: Sum function fails, sum((9/8)*(2/3)**i, i, 0, inf), simpsum; gives answer 216 instead of 9/8=3.375 Maxima version: 5.14.0 Maxima build date: 21:46 12/27/2007 host type: i686-pc-mingw32 lisp-implementation-type: GNU Common Lisp (GCL) lisp-implementation-version: GCL 2.6.8 (%i51) sum((5/4)*(2/3)**i, i, 0, inf), simpsum; 15 (%o51) -- 4 (%i52) sum((1.25)*(2/3)**i, i, 0, inf), simpsum; (%o52) 3.75 (%i53) sum((9/8)*(2/3)**i, i, 0, inf), simpsum; (%o53) 216 (%i54) sum((1.125)*(2/3)**i, i, 0, inf), simpsum; (%o54) 3.375 ---------------------------------------------------------------------- Comment By: Nobody/Anonymous (nobody) Date: 2008-01-28 23:07 Message: Logged In: NO built maxima form cvs with cmucl sum((9/8)*(2/3)**i,i,0,inf); returns correct resulta : 27/8 thanks andrejv delandre ---------------------------------------------------------------------- Comment By: delandre (delandre) Date: 2008-01-28 22:06 Message: Logged In: YES user_id=1993771 Originator: NO the same result with maxima 5.13 in sage ---------------------------------------------------------------------- Comment By: Andrej Vodopivec (andrejv) Date: 2008-01-28 09:38 Message: Logged In: YES user_id=1179910 Originator: NO This works as expected on sbcl + cvs maxima: (%i1) sum((9/8)*(2/3)**i, i, 0, inf), simpsum; (%o1) 27/8 (%i2) build_info()$ Maxima version: 5.14.0cvs Maxima build date: 23:27 1/26/2008 host type: i386-apple-darwin8.11.1 lisp-implementation-type: SBCL lisp-implementation-version: 1.0.10 Andrej ---------------------------------------------------------------------- Comment By: Tore Gaupseth (toregaupseth) Date: 2008-01-25 02:17 Message: Logged In: YES user_id=1234122 Originator: YES The third line should read gives answer 216 instead of 27/8=3.375 -and maybe the fault is that a math formula gives 3^3 * (2^(-3)) and Maxima somehow calculates 3^3 * 2^3 ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1879521&group_id=4933 |