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From: SourceForge.net <noreply@so...>  20110729 18:29:47

Bugs item #3382358, was opened at 20110729 18:29 Message generated for change (Tracker Item Submitted) made by You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3382358&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: https://www.google.com/accounts () Assigned to: Nobody/Anonymous (nobody) Summary: integrating function with signum incorrect Initial Comment: In Maxima 5.24.0: (%i11) integrate(x*signum(x^21/4),x,1,0); 1 (%o11)  2 But the picture makes it pretty clear this should be 1/4. Is this antideriv ok? (%i15) integrate(x*signum(x^21/4),x); ! 2 1! !x  ! ! 4! (%o15)  2 This was originally reported at the Sage trac at http://trac.sagemath.org/sage_trac/ticket/11590  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3382358&group_id=4933 
From: SourceForge.net <noreply@so...>  20110730 02:14:24

Bugs item #3382358, was opened at 20110729 13:29 Message generated for change (Comment added) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3382358&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: https://www.google.com/accounts () Assigned to: Nobody/Anonymous (nobody) Summary: integrating function with signum incorrect Initial Comment: In Maxima 5.24.0: (%i11) integrate(x*signum(x^21/4),x,1,0); 1 (%o11)  2 But the picture makes it pretty clear this should be 1/4. Is this antideriv ok? (%i15) integrate(x*signum(x^21/4),x); ! 2 1! !x  ! ! 4! (%o15)  2 This was originally reported at the Sage trac at http://trac.sagemath.org/sage_trac/ticket/11590  >Comment By: Barton Willis (willisbl) Date: 20110729 21:14 Message: By the way: (%i4) load(abs_integrate)$ Correct antiderivative: (%i5) 'integrate(x*signum(x^21/4),x); (%o5) abs(x^21/4)/2 Correct definite integral (%i6) 'integrate(x*signum(x^21/4),x,1,0); (%o6) 1/4  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3382358&group_id=4933 
From: SourceForge.net <noreply@so...>  20110824 17:35:26

Bugs item #3382358, was opened at 20110729 18:29 Message generated for change (Comment added) made by You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3382358&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: https://www.google.com/accounts () Assigned to: Nobody/Anonymous (nobody) Summary: integrating function with signum incorrect Initial Comment: In Maxima 5.24.0: (%i11) integrate(x*signum(x^21/4),x,1,0); 1 (%o11)  2 But the picture makes it pretty clear this should be 1/4. Is this antideriv ok? (%i15) integrate(x*signum(x^21/4),x); ! 2 1! !x  ! ! 4! (%o15)  2 This was originally reported at the Sage trac at http://trac.sagemath.org/sage_trac/ticket/11590  >Comment By: https://www.google.com/accounts () Date: 20110824 17:33 Message: Good point, and we're working on getting that loaded in automatically. Doesn't fix the original problem, though.  Comment By: Barton Willis (willisbl) Date: 20110730 02:14 Message: By the way: (%i4) load(abs_integrate)$ Correct antiderivative: (%i5) 'integrate(x*signum(x^21/4),x); (%o5) abs(x^21/4)/2 Correct definite integral (%i6) 'integrate(x*signum(x^21/4),x,1,0); (%o6) 1/4  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3382358&group_id=4933 
From: SourceForge.net <noreply@so...>  20120201 02:27:24

Bugs item #3382358, was opened at 20110729 11:29 Message generated for change (Comment added) made by You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3382358&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: https://www.google.com/accounts () Assigned to: Nobody/Anonymous (nobody) Summary: integrating function with signum incorrect Initial Comment: In Maxima 5.24.0: (%i11) integrate(x*signum(x^21/4),x,1,0); 1 (%o11)  2 But the picture makes it pretty clear this should be 1/4. Is this antideriv ok? (%i15) integrate(x*signum(x^21/4),x); ! 2 1! !x  ! ! 4! (%o15)  2 This was originally reported at the Sage trac at http://trac.sagemath.org/sage_trac/ticket/11590  >Comment By: https://www.google.com/accounts () Date: 20120131 18:27 Message: Update: why doesn't regular integrate work? Only 'integrate does. (%i5) display2d:false; (%o5) false (%i6) integrate(x*signum(x^21/4),x,1,0); (%o6) 1/2 (%i7) 'integrate(x*signum(x^21/4),x,1,0); (%o7) 1/4 Again, this doesn't fix the problem that the answer is just wrong currently :( but at least would help use get it to work right in Sage.  Comment By: https://www.google.com/accounts () Date: 20110824 10:33 Message: Good point, and we're working on getting that loaded in automatically. Doesn't fix the original problem, though.  Comment By: Barton Willis (willisbl) Date: 20110729 19:14 Message: By the way: (%i4) load(abs_integrate)$ Correct antiderivative: (%i5) 'integrate(x*signum(x^21/4),x); (%o5) abs(x^21/4)/2 Correct definite integral (%i6) 'integrate(x*signum(x^21/4),x,1,0); (%o6) 1/4  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3382358&group_id=4933 