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From: SourceForge.net <noreply@so...>  20070723 12:39:24

Bugs item #1758004, was opened at 20070721 07:10 Message generated for change (Comment added) made by dgildea You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1758004&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: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: integration needs %piargs : true Initial Comment: OK: (%i1) integrate(1/(1+sin(x)^2),x,0,2*%pi), %piargs : true; (%o1) sqrt(2)*%pi Not OK when %piargs : false (%i2) integrate(1/(1+sin(x)^2),x,0,2*%pi), %piargs : false; (%o2) (sqrt(2)*atan(sqrt(2)*tan(2*%pi)))/2(sqrt(2)*atan(sqrt(2)*tan(0)))/2 (%i3) ''%; (%o3) 0  >Comment By: Dan Gildea (dgildea) Date: 20070723 08:39 Message: Logged In: YES user_id=1797506 Originator: NO see also 1741705  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1758004&group_id=4933 
From: SourceForge.net <noreply@so...>  20070723 12:36:34

Bugs item #1730044, was opened at 20070602 16:01 Message generated for change (Settings changed) made by dgildea You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1730044&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 Group: None >Status: Closed Resolution: Fixed Priority: 5 Private: No Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: powerseries(1+x^n,x,0) wrong Initial Comment: powerseries(1+x^n,x,0) => 'sum((1)^i1*x^(i1*n),i1,0,inf) but this is actually the series for 1/(1+x^n) Conversely, powerseries(1/(1+x^n),x,0) => Unable to expand This might be a simple mixup somewhere in the code.... Maxima 5.11.0 GCL 2.6.8 Cygwin  Comment By: Dan Gildea (dgildea) Date: 20070718 06:34 Message: Logged In: YES user_id=1797506 Originator: NO sign problem fixed in series.lisp rev 1.13. new behavior: (%i2) powerseries(1+x^n,x,0); (%o2) ('sum(x^(i1*n)/beta(2i1,i1+1),i1,0,inf))/2 (%i3) powerseries(1/(1+x^n),x,0); (%o3) "Unable to expand" (%i4) declare(n, integer); (%o4) done (%i5) powerseries(1+x^n,x,0); (%o5) ('sum(x^(i3*n)/beta(2i3,i3+1),i3,0,inf))/2 (%i6) powerseries(1/(1+x^n),x,0); (%o6) 'sum((1)^i4*x^(i4*n),i4,0,inf) I suppose ideally %o6 should only happen in n is known to be a positive integer.  Comment By: Dan Gildea (dgildea) Date: 20070718 06:34 Message: Logged In: YES user_id=1797506 Originator: NO The reported bug is not present in the current cvs version of Maxima. Thank you for your report. If you see this bug in a later version of Maxima, please submit a new bug report.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1730044&group_id=4933 
From: SourceForge.net <noreply@so...>  20070723 12:31:21

Bugs item #831445, was opened at 20031027 18:44 Message generated for change (Comment added) made by dgildea You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=831445&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 Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: gcd/subres  another case Initial Comment: ratsimp of ((SQRT(3)*%I/21/2)*(SQRT(84541)*%I/(6*SQRT(3)) 11/2)^(1/3)+28*(SQRT(3)*%I/21/2)/(3*(SQRT(84541) *%I/(6*SQRT(3))11/2)^(1/3))+4)^312*((SQRT(3)*% I/21/2)*(SQRT(84541)*%I/(6*SQRT(3))11/2)^(1/3) +28*(SQRT(3)*%I/21/2)/(3*(SQRT(84541)*%I/ (6*SQRT(3))11/2)^(1/3))+4)^2+20*((SQRT(3)*%I/2 1/2)*(SQRT(84541)*%I/(6*SQRT(3))11/2)^(1/3)+28* (SQRT(3)*%I/21/2)/(3*(SQRT(84541)*%I/(6*SQRT (3))11/2)^(1/3))+4)+59 gives "quotient by zero" for gcd = subres, red, or algebraic; and an infinite loop (or at least is taking a very long time) for mod. spmod and ez work. Maxima 5.9.0 gcl 2.5.0  >Comment By: Dan Gildea (dgildea) Date: 20070723 08:31 Message: Logged In: YES user_id=1797506 Originator: NO subresgcd keeps taking remainders until it is left with a "common factor" of (#:sqrt(3)1764 1 1 0 (#:3^(1/6)1763 3 1)) which it doesn't realize is zero. oldgcd attempts to divide this out and gets division by zero.  Comment By: Robert Dodier (robert_dodier) Date: 20060711 01:11 Message: Logged In: YES user_id=501686 Same behavior in 5.9.3cvs.  Comment By: Stavros Macrakis (macrakis) Date: 20031027 18:46 Message: Logged In: YES user_id=588346 By the way, all the gcd algorithms work correctly with algebraic:true (not the default).  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=831445&group_id=4933 