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From: SourceForge.net <noreply@so...>  20071209 22:57:42

Bugs item #1847543, was opened at 20071209 23:57 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=1847543&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: Lisp Core  Integration Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Henrik Holst (hholst) Assigned to: Nobody/Anonymous (nobody) Summary: Integration problem of a special periodic function Initial Comment: Hello Maxima developers, I am trying to integrate f(x) := 1/(11/10+sin(2*%pi*x)); from x=0 to x=1. It works in Mathematica 5, and gives the correct answer: 10/Sqrt(21) Maxima gives no answer however it gives an answer if I input g(x) := 1/(11/10+sin(x)); and integrate from x=0 to x=2*%pi. Also (maybe related), if you try to integrate with a constant "a" times x instead of 2*%pi*x, maxima asks for the sign of a. If the reply is "positive" it just comsumes 100% CPU. [1] [1] Investigation by lindi @ freenode irc Maxima version: 5.12.0 Maxima build date: 21:41 7/20/2007 host type: x86_64unknownlinuxgnu lispimplementationtype: GNU Common Lisp (GCL) lispimplementationversion: GCL 2.6.7  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1847543&group_id=4933 
From: SourceForge.net <noreply@so...>  20071209 17:07:18

Bugs item #1845375, was opened at 20071206 04:18 Message generated for change (Comment added) made by dgildea You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1845375&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: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: Satoshi Adachi (satoshi_adachi) Assigned to: Nobody/Anonymous (nobody) Summary: factcomb() in 5.13.0 gives wrong result Initial Comment: y: 3*x/(2*3^x*x!); z:factcomb(y); is calculated by maxima5.13.0 as Maxima 5.13.0 http://maxima.sourceforge.net Using Lisp GNU Common Lisp (GCL) GCL 2.6.7 (aka GCL) Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. This is a development version of Maxima. The function bug_report() provides bug reporting information. (%i1) batch(bug01A.maxima) batching #p/Volumes/HFS+2/home/adachi/work/270/bug01A.maxima 3 x (%i2) y :  x 2 3 x! 3 x (%o2)  x 2 3 x! (%i3) z : factcomb(y) 1  x 2 3 (%o3)  (x  1)! This is wrong. Maxima5.9.2 gives the correct result as Maxima 5.9.2 http://maxima.sourceforge.net Using Lisp GNU Common Lisp (GCL) GCL 2.6.7 (aka GCL) Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. This is a development version of Maxima. The function bug_report() provides bug reporting information. (%i1) batch(bug01A.maxima) batching #p/Volumes/HFS+2/home/adachi/work/270/bug01A.maxima 3 x (%i2) y :  x 2 3 x! 3 x (%o2)  x 2 3 x! (%i3) z : factcomb(y) 3 (%o3)  x 2 3 (x  1)!  >Comment By: Dan Gildea (dgildea) Date: 20071209 12:07 Message: Logged In: YES user_id=1797506 Originator: NO This was caused by a general simplification problem: 3*(1/2)*3^x => 2*3^(x+1) Fixed in simp.lisp rev 1.46.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1845375&group_id=4933 
From: SourceForge.net <noreply@so...>  20071209 17:05:46

Bugs item #1407378, was opened at 20060116 09:35 Message generated for change (Comment added) made by dgildea You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1407378&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: Lisp Core  Complex Group: None >Status: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: Robert Dodier (robert_dodier) Assigned to: Nobody/Anonymous (nobody) Summary: polarform returns a rectangular expression for float argumen Initial Comment: polarform (1.0 + %i); => 1.414213562373095 (.7071067811865475 %i + .7071067811865476) build_info(); => Maxima version: 5.9.2.19cvs Maxima build date: 16:26 1/15/2006 host type: i686redhatlinuxgnu lispimplementationtype: SBCL lispimplementationversion: 0.9.4 In 5.9.2: polarform (1.0 + %i); => 1.414213562373095 * %e^(0.78539816339745*%i)  >Comment By: Dan Gildea (dgildea) Date: 20071209 12:05 Message: Logged In: YES user_id=1797506 Originator: NO In simp.lisp rev 1.46, made numeric evaluation of exp(%i*float) dependent on %emode, which is set to false inside polarform. (%i2) polarform(1.0 + %i); (%o2) 1.414213562373095*%e^(.7853981633974483*%i) (%i3) ev(%); (%o3) 1.414213562373095*(.7071067811865475*%i+.7071067811865476) (%i4) polarform(1+%i); (%o4) sqrt(2)*%e^(%i*%pi/4) (%i5) ev(%); (%o5) sqrt(2)*(sqrt(2)*%i/2+sqrt(2)/2) (%i6) %emode:false; (%o6) false (%i7) polarform(1.0 + %i); (%o7) 1.414213562373095*%e^(.7853981633974483*%i) (%i8) ev(%); (%o8) 1.414213562373095*%e^(.7853981633974483*%i) (%i9) polarform(1+%i); (%o9) sqrt(2)*%e^(%i*%pi/4) (%i10) ev(%); (%o10) sqrt(2)*%e^(%i*%pi/4)  Comment By: Raymond Toy (rtoy) Date: 20060201 10:33 Message: Logged In: YES user_id=28849 FWIW, here is a replacement that preserves exponential form. But see also the discussion at http://www.math.utexas.edu/pipermail/maxima/2006/011955.html (defmfun $polarform (xx) (cond ((and (not (atom xx)) (memq (caar xx) '(mequal mlist $matrix))) (cons (car xx) (mapcar #'$polarform (cdr xx)))) (t ((lambda (aas $%emode) (mul (car aas) `((mexpt simp) $%e ,(mul '$%i (cdr aas))))) (absarg xx) nil))))  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1407378&group_id=4933 