## [Maxima-bugs] [ maxima-Bugs-1547769 ] integrate(sqrt(x^3/(2*a-x)),x,0,2*a); ==> internal error

 [Maxima-bugs] [ maxima-Bugs-1547769 ] integrate(sqrt(x^3/(2*a-x)),x,0,2*a); ==> internal error From: SourceForge.net - 2006-08-31 20:14:39 ```Bugs item #1547769, was opened at 2006-08-28 05:36 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1547769&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: Ralf Stephan (rwst) Assigned to: Nobody/Anonymous (nobody) Summary: integrate(sqrt(x^3/(2*a-x)),x,0,2*a); ==> internal error Initial Comment: (%i1) integrate(sqrt(x^3/(2*a-x)),x,0,2*a); Is a positive, negative, or zero? pos; `sign' called on an imaginary argument: %i -- an error. Quitting. To debug this try debugmode(true); (%i2) AFAIK, this indefinite integral should have a definite value. ---------------------------------------------------------------------- >Comment By: Raymond Toy (rtoy) Date: 2006-08-31 16:14 Message: Logged In: YES user_id=28849 Maxima can't evaluate the integral, but it can evaluate the equivalent integral integrate(sqrt(x^3)/sqrt(2*a-x),x,0,2*a). The problem is bata0 doesn't recognize that sqrt(x^3/(2*a-x)) has the form x^kk*(b*x^n+a)^l. ---------------------------------------------------------------------- Comment By: Raymond Toy (rtoy) Date: 2006-08-30 17:12 Message: Logged In: YES user_id=28849 I tried this with CVS maxima. I don't get the error; the integral is returned. Not sure if maxima should be able to evaluate this integral or not, though. It currently can't. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1547769&group_id=4933 ```

 [Maxima-bugs] [ maxima-Bugs-1547769 ] integrate(sqrt(x^3/(2*a-x)),x,0,2*a); ==> internal error From: SourceForge.net - 2006-08-28 09:36:41 ```Bugs item #1547769, was opened at 2006-08-28 11:36 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=1547769&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: Ralf Stephan (rwst) Assigned to: Nobody/Anonymous (nobody) Summary: integrate(sqrt(x^3/(2*a-x)),x,0,2*a); ==> internal error Initial Comment: (%i1) integrate(sqrt(x^3/(2*a-x)),x,0,2*a); Is a positive, negative, or zero? pos; `sign' called on an imaginary argument: %i -- an error. Quitting. To debug this try debugmode(true); (%i2) AFAIK, this indefinite integral should have a definite value. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1547769&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-1547769 ] integrate(sqrt(x^3/(2*a-x)),x,0,2*a); ==> internal error From: SourceForge.net - 2006-08-30 21:12:56 ```Bugs item #1547769, was opened at 2006-08-28 05:36 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1547769&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: Ralf Stephan (rwst) Assigned to: Nobody/Anonymous (nobody) Summary: integrate(sqrt(x^3/(2*a-x)),x,0,2*a); ==> internal error Initial Comment: (%i1) integrate(sqrt(x^3/(2*a-x)),x,0,2*a); Is a positive, negative, or zero? pos; `sign' called on an imaginary argument: %i -- an error. Quitting. To debug this try debugmode(true); (%i2) AFAIK, this indefinite integral should have a definite value. ---------------------------------------------------------------------- >Comment By: Raymond Toy (rtoy) Date: 2006-08-30 17:12 Message: Logged In: YES user_id=28849 I tried this with CVS maxima. I don't get the error; the integral is returned. Not sure if maxima should be able to evaluate this integral or not, though. It currently can't. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1547769&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-1547769 ] integrate(sqrt(x^3/(2*a-x)),x,0,2*a); ==> internal error From: SourceForge.net - 2006-08-31 20:14:39 ```Bugs item #1547769, was opened at 2006-08-28 05:36 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1547769&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: Ralf Stephan (rwst) Assigned to: Nobody/Anonymous (nobody) Summary: integrate(sqrt(x^3/(2*a-x)),x,0,2*a); ==> internal error Initial Comment: (%i1) integrate(sqrt(x^3/(2*a-x)),x,0,2*a); Is a positive, negative, or zero? pos; `sign' called on an imaginary argument: %i -- an error. Quitting. To debug this try debugmode(true); (%i2) AFAIK, this indefinite integral should have a definite value. ---------------------------------------------------------------------- >Comment By: Raymond Toy (rtoy) Date: 2006-08-31 16:14 Message: Logged In: YES user_id=28849 Maxima can't evaluate the integral, but it can evaluate the equivalent integral integrate(sqrt(x^3)/sqrt(2*a-x),x,0,2*a). The problem is bata0 doesn't recognize that sqrt(x^3/(2*a-x)) has the form x^kk*(b*x^n+a)^l. ---------------------------------------------------------------------- Comment By: Raymond Toy (rtoy) Date: 2006-08-30 17:12 Message: Logged In: YES user_id=28849 I tried this with CVS maxima. I don't get the error; the integral is returned. Not sure if maxima should be able to evaluate this integral or not, though. It currently can't. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1547769&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-1547769 ] integrate(sqrt(x^3/(2*a-x)),x,0,2*a); ==> internal error From: SourceForge.net - 2006-09-01 18:17:19 ```Bugs item #1547769, was opened at 2006-08-28 05:36 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1547769&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 Submitted By: Ralf Stephan (rwst) Assigned to: Nobody/Anonymous (nobody) Summary: integrate(sqrt(x^3/(2*a-x)),x,0,2*a); ==> internal error Initial Comment: (%i1) integrate(sqrt(x^3/(2*a-x)),x,0,2*a); Is a positive, negative, or zero? pos; `sign' called on an imaginary argument: %i -- an error. Quitting. To debug this try debugmode(true); (%i2) AFAIK, this indefinite integral should have a definite value. ---------------------------------------------------------------------- >Comment By: Raymond Toy (rtoy) Date: 2006-09-01 14:17 Message: Logged In: YES user_id=28849 Closing report. Maxima doesn't have the bug, and bata0 has been modified (defint.lisp, rev 1.27) to recognize this form and evaluate it correctly. ---------------------------------------------------------------------- Comment By: Raymond Toy (rtoy) Date: 2006-08-31 16:14 Message: Logged In: YES user_id=28849 Maxima can't evaluate the integral, but it can evaluate the equivalent integral integrate(sqrt(x^3)/sqrt(2*a-x),x,0,2*a). The problem is bata0 doesn't recognize that sqrt(x^3/(2*a-x)) has the form x^kk*(b*x^n+a)^l. ---------------------------------------------------------------------- Comment By: Raymond Toy (rtoy) Date: 2006-08-30 17:12 Message: Logged In: YES user_id=28849 I tried this with CVS maxima. I don't get the error; the integral is returned. Not sure if maxima should be able to evaluate this integral or not, though. It currently can't. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1547769&group_id=4933 ```