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From: SourceForge.net <noreply@so...>  20120613 12:32:00

Bugs item #3534858, was opened at 20120613 05:32 Message generated for change (Tracker Item Submitted) made by chrishalliwell You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3534858&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: None Group: To be reviewed Status: Open Resolution: None Priority: 5 Private: No Submitted By: Chris (chrishalliwell) Assigned to: Nobody/Anonymous (nobody) Summary: Calculus mistake: wrong answer: limit Initial Comment: Maxima version: 5.27.0 limit((sin(x)tan(x))/(x*(cos(x)1)),x,0); gives 0, but should be 1 and limit((sin(x)tan(x))/(x^2*(cos(x)1)),x,0); gives 0, but should be infinity (+ at + and  at  inf)  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3534858&group_id=4933 
From: SourceForge.net <noreply@so...>  20120614 02:27:34

Bugs item #3534858, was opened at 20120613 05:32 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3534858&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: To be reviewed Status: Open Resolution: None Priority: 5 Private: No Submitted By: Chris (chrishalliwell) Assigned to: Nobody/Anonymous (nobody) Summary: Calculus mistake: wrong answer: limit Initial Comment: Maxima version: 5.27.0 limit((sin(x)tan(x))/(x*(cos(x)1)),x,0); gives 0, but should be 1 and limit((sin(x)tan(x))/(x^2*(cos(x)1)),x,0); gives 0, but should be infinity (+ at + and  at  inf)  >Comment By: Raymond Toy (rtoy) Date: 20120613 19:27 Message: limit most likely gets it wrong because it doesn't see that the expression is the same as sin(x)/cos(x)/x. (trigsimp produces this.) Then limit is correct. tlimit produces the correct limit.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3534858&group_id=4933 
From: SourceForge.net <noreply@so...>  20120614 11:30:08

Bugs item #3534858, was opened at 20120613 05:32 Message generated for change (Comment added) made by chrishalliwell You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3534858&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: To be reviewed Status: Open Resolution: None Priority: 5 Private: No Submitted By: Chris (chrishalliwell) Assigned to: Nobody/Anonymous (nobody) Summary: Calculus mistake: wrong answer: limit Initial Comment: Maxima version: 5.27.0 limit((sin(x)tan(x))/(x*(cos(x)1)),x,0); gives 0, but should be 1 and limit((sin(x)tan(x))/(x^2*(cos(x)1)),x,0); gives 0, but should be infinity (+ at + and  at  inf)  Comment By: Chris (chrishalliwell) Date: 20120614 04:30 Message: So is this important to be fixed or we will leave this fot the users to be careful with trigonometric function limits? I think that limit should always use trigsimp and all remaining simplify functions to maximize probability of getting correct value.  Comment By: Raymond Toy (rtoy) Date: 20120613 19:27 Message: limit most likely gets it wrong because it doesn't see that the expression is the same as sin(x)/cos(x)/x. (trigsimp produces this.) Then limit is correct. tlimit produces the correct limit.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3534858&group_id=4933 
From: SourceForge.net <noreply@so...>  20120616 12:26:26

Bugs item #3534858, was opened at 20120613 05:32 Message generated for change (Comment added) made by dgildea You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3534858&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: To be reviewed >Status: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: Chris (chrishalliwell) Assigned to: Nobody/Anonymous (nobody) Summary: Calculus mistake: wrong answer: limit Initial Comment: Maxima version: 5.27.0 limit((sin(x)tan(x))/(x*(cos(x)1)),x,0); gives 0, but should be 1 and limit((sin(x)tan(x))/(x^2*(cos(x)1)),x,0); gives 0, but should be infinity (+ at + and  at  inf)  >Comment By: Dan Gildea (dgildea) Date: 20120616 05:26 Message: Fixed in limit.lisp.  Comment By: Chris (chrishalliwell) Date: 20120614 04:30 Message: So is this important to be fixed or we will leave this fot the users to be careful with trigonometric function limits? I think that limit should always use trigsimp and all remaining simplify functions to maximize probability of getting correct value.  Comment By: Raymond Toy (rtoy) Date: 20120613 19:27 Message: limit most likely gets it wrong because it doesn't see that the expression is the same as sin(x)/cos(x)/x. (trigsimp produces this.) Then limit is correct. tlimit produces the correct limit.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3534858&group_id=4933 
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