From: <no...@so...> - 2002-10-24 00:03:57
|
Bugs item #612106, was opened at 2002-09-20 22:59 You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=612106&group_id=4933 Category: None Group: None Status: Open Resolution: None >Priority: 2 Submitted By: David Billinghurst (billingd) Assigned to: Nobody/Anonymous (nobody) >Summary: ode2 chokes on invalid input Initial Comment: Current CVS with gcl/windows (C1) ode2( (2*x*y-exp(-2*y))*'diff(y,x)=0, y, x); Error: . Fast links are on: do (si::use-fast-links nil) for debugging Error signalled by MACSYMA-TOP-LEVEL. Broken at MACSYMA-TOP-LEVEL. Type :H for Help. MAXIMA>> This is an example from maximabook. I have included it in rtestode.mac, but commented it out. ---------------------------------------------------------------------- >Comment By: David Billinghurst (billingd) Date: 2002-10-24 10:03 Message: Logged In: YES user_id=365569 The ode is has a typo so desimp() simplifies the de to dy/dx, and then chokes. Need better error handling here. The correct equation is (2*x*y-exp(-2*y))*'diff(y,x)+y=0, and this works. The test is now enabled in rtestode.mac, and the priority of the bug has been lowered. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=612106&group_id=4933 |
From: SourceForge.net <no...@so...> - 2006-06-26 18:44:45
|
Bugs item #612106, was opened at 2002-09-20 06:59 Message generated for change (Comment added) made by robert_dodier You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=612106&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: 2 Submitted By: David Billinghurst (billingd) Assigned to: Nobody/Anonymous (nobody) Summary: ode2 chokes on invalid input Initial Comment: Current CVS with gcl/windows (C1) ode2( (2*x*y-exp(-2*y))*'diff(y,x)=0, y, x); Error: . Fast links are on: do (si::use-fast-links nil) for debugging Error signalled by MACSYMA-TOP-LEVEL. Broken at MACSYMA-TOP-LEVEL. Type :H for Help. MAXIMA>> This is an example from maximabook. I have included it in rtestode.mac, but commented it out. ---------------------------------------------------------------------- >Comment By: Robert Dodier (robert_dodier) Date: 2006-06-26 12:44 Message: Logged In: YES user_id=501686 Not observed in 5.9.1 nor in 5.9.3. Both return y = %c as the solution for ode2( (2*x*y-exp(-2*y))*'diff(y,x)=0, y, x); . Closing this report as fixed. ---------------------------------------------------------------------- Comment By: David Billinghurst (billingd) Date: 2002-10-23 18:03 Message: Logged In: YES user_id=365569 The ode is has a typo so desimp() simplifies the de to dy/dx, and then chokes. Need better error handling here. The correct equation is (2*x*y-exp(-2*y))*'diff(y,x)+y=0, and this works. The test is now enabled in rtestode.mac, and the priority of the bug has been lowered. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=612106&group_id=4933 |