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From: SourceForge.net <noreply@so...>  20081108 19:52:03

Bugs item #2243836, was opened at 20081108 20:52 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=2243836&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  Differential eqns Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Rüdiger Sonderfeld (kingruedi) Assigned to: Nobody/Anonymous (nobody) Summary: desolve fails to solve diffeqn. Initial Comment: I tried to solve two diffeqns with a boundary condition. But desolve fails to correctly laplace transform the eqn. Maxima 5.16post http://maxima.sourceforge.net Using Lisp SBCL 1.0.18.debian Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. The function bug_report() provides bug reporting information. (%i1) assume(a > 0); (%o1) [a > 0] (%i2) assume(b > 0); (%o2) [b > 0] (%i3) assume(x20 > 0); (%o3) [x20 > 0] (%i4) 'diff(x1(t), t) = x1(t) + 1/2; d 1 (%o4)  (x1(t)) =   x1(t) dt 2 (%i5) 'diff(x2(t), t) = a*x1(t)*sqrt(b*x2(t)); d (%o5)  (x2(t)) =  a sqrt(b) x1(t) sqrt(x2(t)) dt (%i6) atvalue(x1(t), t=0, 0); (%o6) 0 (%i7) atvalue(x2(t), t=0, x20); (%o7) x20 (%i8) desolve([%o4, %o5], [x1(t), x2(t)]);  t 1 %e (%o8) [x1(t) =   , x2(t) = 2 2 x20  a sqrt(b) laplace(x1(t) sqrt(x2(t)), t, false) ilt(, false, t)] false 5.13.0 behaves similar (%i8) desolve([%o4, %o5], [x1(t), x2(t)]);  t 1 %e (%o8) [x1(t) =   , x2(t) = 2 2 x20  a sqrt(b) laplace(x1(t) sqrt(x2(t)), t, lvar) ilt(, lvar, t)] lvar  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2243836&group_id=4933 
From: SourceForge.net <noreply@so...>  20081108 09:21:56

Bugs item #2236782, was opened at 20081107 22:30 Message generated for change (Settings changed) made by andrejv You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2236782&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: Share Libraries Group: None >Status: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: Alexey Beshenov (beshenov) Assigned to: Andrej Vodopivec (andrejv) Summary: simplify_sum gives a wrong answer for unsimplified terms Initial Comment: Here simplify_sum gives a wrong answer: (%i1) load ("simplify_sum")$ (%i2) kth_term : 1/(2*k)+1/(2*2*k+1)+1/(2*2*k+3)$ (%i3) simplify_sum(sum(kth_term,k,1,inf)); (%o3) inf However, it gives the right answer for the ratsimp'ed term. (%i4) simplify_sum(sum(ratsimp(kth_term),k,1,inf)); (%o4) (3*log(2)+%pi/2%gamma+4/3)/4(3*log(2)%pi/2%gamma+4)/4%gamma/2 (%i5) ratsimp(4/3+%); (%o5) 3*log(2)/2  Comment By: Andrej Vodopivec (andrejv) Date: 20081108 10:21 Message: With maxima from cvs I get (%i1) load(simplify_sum)$ (%i2) kth_term : 1/(2*k)+1/(2*2*k+1)+1/(2*2*k+3)$ (%i3) simplify_sum(sum(kth_term,k,1,inf)); (%o3) (9*log(2)8)/6 (%i4) simplify_sum(sum(ratsimp(kth_term),k,1,inf)); (%o4) (9*log(2)8)/6 (%i5) (3*log(2)+%pi/2%gamma+4/3)/4(3*log(2)%pi/2%gamma+4)/4%gamma/2$ (%i6) ratsimp(%o4%o5); (%o6) 0 (%i7) build_info()$ Maxima version: 5.16post Maxima build date: 13:6 11/7/2008 host type: i386appledarwin9.5.0 lispimplementationtype: CMU Common Lisp lispimplementationversion: Stage 3 20071107T024924 (19D) I'm closing this as fixed. Andrej  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2236782&group_id=4933 
From: SourceForge.net <noreply@so...>  20081108 09:21:50

Bugs item #2236782, was opened at 20081107 22:30 Message generated for change (Comment added) made by andrejv You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2236782&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: Share Libraries Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Alexey Beshenov (beshenov) Assigned to: Andrej Vodopivec (andrejv) Summary: simplify_sum gives a wrong answer for unsimplified terms Initial Comment: Here simplify_sum gives a wrong answer: (%i1) load ("simplify_sum")$ (%i2) kth_term : 1/(2*k)+1/(2*2*k+1)+1/(2*2*k+3)$ (%i3) simplify_sum(sum(kth_term,k,1,inf)); (%o3) inf However, it gives the right answer for the ratsimp'ed term. (%i4) simplify_sum(sum(ratsimp(kth_term),k,1,inf)); (%o4) (3*log(2)+%pi/2%gamma+4/3)/4(3*log(2)%pi/2%gamma+4)/4%gamma/2 (%i5) ratsimp(4/3+%); (%o5) 3*log(2)/2  Comment By: Andrej Vodopivec (andrejv) Date: 20081108 10:21 Message: With maxima from cvs I get (%i1) load(simplify_sum)$ (%i2) kth_term : 1/(2*k)+1/(2*2*k+1)+1/(2*2*k+3)$ (%i3) simplify_sum(sum(kth_term,k,1,inf)); (%o3) (9*log(2)8)/6 (%i4) simplify_sum(sum(ratsimp(kth_term),k,1,inf)); (%o4) (9*log(2)8)/6 (%i5) (3*log(2)+%pi/2%gamma+4/3)/4(3*log(2)%pi/2%gamma+4)/4%gamma/2$ (%i6) ratsimp(%o4%o5); (%o6) 0 (%i7) build_info()$ Maxima version: 5.16post Maxima build date: 13:6 11/7/2008 host type: i386appledarwin9.5.0 lispimplementationtype: CMU Common Lisp lispimplementationversion: Stage 3 20071107T024924 (19D) I'm closing this as fixed. Andrej  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2236782&group_id=4933 