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[Maxima-bugs] [ maxima-Bugs-671574 ] limits involving x*atan(x) wrong
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From: SourceForge.net <no...@so...> - 2006-07-02 02:08:38
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Bugs item #671574, was opened at 2003-01-20 20:59 Message generated for change (Comment added) made by robert_dodier You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=671574&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 - Limit Group: None >Status: Closed >Resolution: Fixed Priority: 5 Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: limits involving x*atan(x) wrong Initial Comment: limit(x*atan(x)/(x+1),x,inf) => %i * log(-1)/2 NO! tlimit correctly gets %pi/2. limit(x*atan(x)-log(x),x,inf) => minf NO! tlimit correctly gets inf ---------------------------------------------------------------------- >Comment By: Robert Dodier (robert_dodier) Date: 2006-07-01 20:08 Message: Logged In: YES user_id=501686 Not observed in 5.9.3 or 5.9.3cvs. Closing this report as fixed. However for a couple of the examples tlimit gives an incorrect result. Bug report # 1515712 opened for that. ---------------------------------------------------------------------- Comment By: Raymond Toy (rtoy) Date: 2005-12-09 17:39 Message: Logged In: YES user_id=28849 The first two limits now give the correct answers. However, the limit of x*(atan(x)-%pi/2) is returned unevaluated. Not very good, but certainly better than minf. ---------------------------------------------------------------------- Comment By: Stavros Macrakis (macrakis) Date: 2003-04-11 14:08 Message: Logged In: YES user_id=588346 Another interesting case: expr: x*(atan(x)-%pi/2) limit(expr,x,inf) => minf NO! tlimit(expr,x,inf) => -1 OK! Maxima 5.9.0 ---------------------------------------------------------------------- Comment By: Stavros Macrakis (macrakis) Date: 2003-01-20 21:00 Message: Logged In: YES user_id=588346 Maxima 5.5 on Windows ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=671574&group_id=4933 |