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[Maxima-bugs] [ maxima-Bugs-1579852 ] bad integral evaluation

 [Maxima-bugs] [ maxima-Bugs-1579852 ] bad integral evaluation From: SourceForge.net - 2006-10-22 14:53:48 ```Bugs item #1579852, was opened at 2006-10-18 10:15 Message generated for change (Comment added) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1579852&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 Submitted By: Mark Peloquin (incripshin) Assigned to: Nobody/Anonymous (nobody) Summary: bad integral evaluation Initial Comment: The following integral should evaluate to infinity: integrate(x/sqrt(1+x^4), x, 1, inf); This should be obvious since it's essentially integrating 1/x up to infinity, which diverges. Do the work if you like ... it diverges. Maxima evaluates this to: log((2*sqrt(2)+3)/(24*sqrt(2)+34))/4 However, maxima can tell that this diverges: limit(integrate(x/sqrt(1+x^4), x), x, inf) ---------------------------------------------------------------------- Comment By: Nobody/Anonymous (nobody) Date: 2006-10-22 07:53 Message: Logged In: NO In version 5.10.0 maxima gives the correct answer: (%i28) integrate(x/sqrt(1+x^4), x, 1, inf); Integral is divergent -- an error. Quitting. To debug this try debugmode(true); ---------------------------------------------------------------------- Comment By: Raymond Toy (rtoy) Date: 2006-10-21 12:41 Message: Logged In: YES user_id=28849 What version? 5.10.0 says the integrate(x/sqrt(1+x^4),x,1,inf) is divergent. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1579852&group_id=4933 ```

 [Maxima-bugs] [ maxima-Bugs-1579852 ] bad integral evaluation From: SourceForge.net - 2006-10-18 17:15:55 ```Bugs item #1579852, was opened at 2006-10-18 19:15 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=1579852&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 Submitted By: Mark Peloquin (incripshin) Assigned to: Nobody/Anonymous (nobody) Summary: bad integral evaluation Initial Comment: The following integral should evaluate to infinity: integrate(x/sqrt(1+x^4), x, 1, inf); This should be obvious since it's essentially integrating 1/x up to infinity, which diverges. Do the work if you like ... it diverges. Maxima evaluates this to: log((2*sqrt(2)+3)/(24*sqrt(2)+34))/4 However, maxima can tell that this diverges: limit(integrate(x/sqrt(1+x^4), x), x, inf) ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1579852&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-1579852 ] bad integral evaluation From: SourceForge.net - 2006-10-21 19:41:32 ```Bugs item #1579852, was opened at 2006-10-18 13:15 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1579852&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 Submitted By: Mark Peloquin (incripshin) Assigned to: Nobody/Anonymous (nobody) Summary: bad integral evaluation Initial Comment: The following integral should evaluate to infinity: integrate(x/sqrt(1+x^4), x, 1, inf); This should be obvious since it's essentially integrating 1/x up to infinity, which diverges. Do the work if you like ... it diverges. Maxima evaluates this to: log((2*sqrt(2)+3)/(24*sqrt(2)+34))/4 However, maxima can tell that this diverges: limit(integrate(x/sqrt(1+x^4), x), x, inf) ---------------------------------------------------------------------- >Comment By: Raymond Toy (rtoy) Date: 2006-10-21 15:41 Message: Logged In: YES user_id=28849 What version? 5.10.0 says the integrate(x/sqrt(1+x^4),x,1,inf) is divergent. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1579852&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-1579852 ] bad integral evaluation From: SourceForge.net - 2006-10-22 14:53:48 ```Bugs item #1579852, was opened at 2006-10-18 10:15 Message generated for change (Comment added) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1579852&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 Submitted By: Mark Peloquin (incripshin) Assigned to: Nobody/Anonymous (nobody) Summary: bad integral evaluation Initial Comment: The following integral should evaluate to infinity: integrate(x/sqrt(1+x^4), x, 1, inf); This should be obvious since it's essentially integrating 1/x up to infinity, which diverges. Do the work if you like ... it diverges. Maxima evaluates this to: log((2*sqrt(2)+3)/(24*sqrt(2)+34))/4 However, maxima can tell that this diverges: limit(integrate(x/sqrt(1+x^4), x), x, inf) ---------------------------------------------------------------------- Comment By: Nobody/Anonymous (nobody) Date: 2006-10-22 07:53 Message: Logged In: NO In version 5.10.0 maxima gives the correct answer: (%i28) integrate(x/sqrt(1+x^4), x, 1, inf); Integral is divergent -- an error. Quitting. To debug this try debugmode(true); ---------------------------------------------------------------------- Comment By: Raymond Toy (rtoy) Date: 2006-10-21 12:41 Message: Logged In: YES user_id=28849 What version? 5.10.0 says the integrate(x/sqrt(1+x^4),x,1,inf) is divergent. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1579852&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-1579852 ] bad integral evaluation From: SourceForge.net - 2006-10-22 15:02:42 ```Bugs item #1579852, was opened at 2006-10-18 10:15 Message generated for change (Comment added) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1579852&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 Submitted By: Mark Peloquin (incripshin) Assigned to: Nobody/Anonymous (nobody) Summary: bad integral evaluation Initial Comment: The following integral should evaluate to infinity: integrate(x/sqrt(1+x^4), x, 1, inf); This should be obvious since it's essentially integrating 1/x up to infinity, which diverges. Do the work if you like ... it diverges. Maxima evaluates this to: log((2*sqrt(2)+3)/(24*sqrt(2)+34))/4 However, maxima can tell that this diverges: limit(integrate(x/sqrt(1+x^4), x), x, inf) ---------------------------------------------------------------------- Comment By: Nobody/Anonymous (nobody) Date: 2006-10-22 08:02 Message: Logged In: NO In version 5.10.0 maxima gives the correct answer: (%i28) integrate(x/sqrt(1+x^4), x, 1, inf); Integral is divergent -- an error. Quitting. To debug this try debugmode(true); ---------------------------------------------------------------------- Comment By: Nobody/Anonymous (nobody) Date: 2006-10-22 07:53 Message: Logged In: NO In version 5.10.0 maxima gives the correct answer: (%i28) integrate(x/sqrt(1+x^4), x, 1, inf); Integral is divergent -- an error. Quitting. To debug this try debugmode(true); ---------------------------------------------------------------------- Comment By: Raymond Toy (rtoy) Date: 2006-10-21 12:41 Message: Logged In: YES user_id=28849 What version? 5.10.0 says the integrate(x/sqrt(1+x^4),x,1,inf) is divergent. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1579852&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-1579852 ] bad integral evaluation From: SourceForge.net - 2006-10-26 15:13:50 ```Bugs item #1579852, was opened at 2006-10-18 13:15 Message generated for change (Settings changed) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1579852&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: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: Mark Peloquin (incripshin) Assigned to: Nobody/Anonymous (nobody) Summary: bad integral evaluation Initial Comment: The following integral should evaluate to infinity: integrate(x/sqrt(1+x^4), x, 1, inf); This should be obvious since it's essentially integrating 1/x up to infinity, which diverges. Do the work if you like ... it diverges. Maxima evaluates this to: log((2*sqrt(2)+3)/(24*sqrt(2)+34))/4 However, maxima can tell that this diverges: limit(integrate(x/sqrt(1+x^4), x), x, inf) ---------------------------------------------------------------------- Comment By: Nobody/Anonymous (nobody) Date: 2006-10-22 11:02 Message: Logged In: NO In version 5.10.0 maxima gives the correct answer: (%i28) integrate(x/sqrt(1+x^4), x, 1, inf); Integral is divergent -- an error. Quitting. To debug this try debugmode(true); ---------------------------------------------------------------------- Comment By: Nobody/Anonymous (nobody) Date: 2006-10-22 10:53 Message: Logged In: NO In version 5.10.0 maxima gives the correct answer: (%i28) integrate(x/sqrt(1+x^4), x, 1, inf); Integral is divergent -- an error. Quitting. To debug this try debugmode(true); ---------------------------------------------------------------------- Comment By: Raymond Toy (rtoy) Date: 2006-10-21 15:41 Message: Logged In: YES user_id=28849 What version? 5.10.0 says the integrate(x/sqrt(1+x^4),x,1,inf) is divergent. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1579852&group_id=4933 ```