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From: SourceForge.net <noreply@so...>  20060729 06:06:46

Bugs item #929704, was opened at 20040405 06:10 Message generated for change (Comment added) made by robert_dodier You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=929704&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: Fix for 5.9.0 Status: Open Resolution: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: defint log(abs(...))/sqrt(...) gives wrong result Initial Comment: integrate((log(abs(diff(4*x*(1x),x))))/(%pi*sqrt(x*(1 x))),x,0,1); The resoult of computation is log(4); ,but it is not corect,the right resoult is log(2);  >Comment By: Robert Dodier (robert_dodier) Date: 20060729 00:06 Message: Logged In: YES user_id=501686 Observed in 5.9.3cvs.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=929704&group_id=4933 
From: SourceForge.net <noreply@so...>  20060902 13:17:12

Bugs item #929704, was opened at 20040405 08:10 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=929704&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: Fix for 5.9.0 Status: Open Resolution: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: defint log(abs(...))/sqrt(...) gives wrong result Initial Comment: integrate((log(abs(diff(4*x*(1x),x))))/(%pi*sqrt(x*(1 x))),x,0,1); The resoult of computation is log(4); ,but it is not corect,the right resoult is log(2);  >Comment By: Raymond Toy (rtoy) Date: 20060902 09:17 Message: Logged In: YES user_id=28849 If you trace antideriv, you can see that it is computing the indefinite integral and returns the result: 2*atan(sqrt(1x)/sqrt(x))*log(abs(8*x4)) The derivative doesn't look anything like the integrand. But maxima thinks the indefinite integral doesn't exist. The function antideriv is doing something but I don't know what.  Comment By: Robert Dodier (robert_dodier) Date: 20060729 02:06 Message: Logged In: YES user_id=501686 Observed in 5.9.3cvs.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=929704&group_id=4933 
From: SourceForge.net <noreply@so...>  20081126 22:30:37

Bugs item #929704, was opened at 20040405 08:10 Message generated for change (Comment added) made by dgildea You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=929704&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: Fix for 5.9.0 >Status: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: defint log(abs(...))/sqrt(...) gives wrong result Initial Comment: integrate((log(abs(diff(4*x*(1x),x))))/(%pi*sqrt(x*(1 x))),x,0,1); The resoult of computation is log(4); ,but it is not corect,the right resoult is log(2);  >Comment By: Dan Gildea (dgildea) Date: 20081126 17:30 Message: fixed in risch.lisp rev 1.16  now returns unevaluated.  Comment By: Raymond Toy (rtoy) Date: 20060902 09:17 Message: Logged In: YES user_id=28849 If you trace antideriv, you can see that it is computing the indefinite integral and returns the result: 2*atan(sqrt(1x)/sqrt(x))*log(abs(8*x4)) The derivative doesn't look anything like the integrand. But maxima thinks the indefinite integral doesn't exist. The function antideriv is doing something but I don't know what.  Comment By: Robert Dodier (robert_dodier) Date: 20060729 02:06 Message: Logged In: YES user_id=501686 Observed in 5.9.3cvs.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=929704&group_id=4933 
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