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From: SourceForge.net <noreply@so...>  20100717 00:07:51

Bugs item #3030806, was opened at 20100717 00:07 Message generated for change (Tracker Item Submitted) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3030806&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  Trigonometry Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: no exact result sin(%pi/12) Initial Comment: Maxima doesn't count exact result of sin(%pi/12) or cos(%pi/12), etc. despite the fact it's simple. It is (sqrt(3)1)/2*sqrt(2)  or (in other form): (sqrt(6)sqrt(2))/4.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3030806&group_id=4933 
From: SourceForge.net <noreply@so...>  20100717 02:16:12

Bugs item #3030806, was opened at 20100716 20:07 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3030806&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  Trigonometry Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: no exact result sin(%pi/12) Initial Comment: Maxima doesn't count exact result of sin(%pi/12) or cos(%pi/12), etc. despite the fact it's simple. It is (sqrt(3)1)/2*sqrt(2)  or (in other form): (sqrt(6)sqrt(2))/4.  >Comment By: Raymond Toy (rtoy) Date: 20100716 22:16 Message: This is really a feature request, not a bug. Having said that, I have some code to handle this and other cases like %pi/3/2^m and %pi/5/2^m.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3030806&group_id=4933 
From: SourceForge.net <noreply@so...>  20100810 16:23:15

Bugs item #3030806, was opened at 20100717 02:07 Message generated for change (Comment added) made by You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3030806&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  Trigonometry Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: no exact result sin(%pi/12) Initial Comment: Maxima doesn't count exact result of sin(%pi/12) or cos(%pi/12), etc. despite the fact it's simple. It is (sqrt(3)1)/2*sqrt(2)  or (in other form): (sqrt(6)sqrt(2))/4.  Comment By: https://www.google.com/accounts () Date: 20100810 18:23 Message: There is also a problem in numerical evaluation of sin(%pi/6) and cos(%pi/3): (%i1) sin(%pi/6),numer; (%o1) .4999999999999999 (%i2) cos(%pi/3),numer; (%o2) .5000000000000001 Why aren't they 0.5? It is not a big error, but it should be fixed  Comment By: Raymond Toy (rtoy) Date: 20100717 04:16 Message: This is really a feature request, not a bug. Having said that, I have some code to handle this and other cases like %pi/3/2^m and %pi/5/2^m.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3030806&group_id=4933 
From: SourceForge.net <noreply@so...>  20100810 18:08:37

Bugs item #3030806, was opened at 20100716 20:07 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3030806&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  Trigonometry Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: no exact result sin(%pi/12) Initial Comment: Maxima doesn't count exact result of sin(%pi/12) or cos(%pi/12), etc. despite the fact it's simple. It is (sqrt(3)1)/2*sqrt(2)  or (in other form): (sqrt(6)sqrt(2))/4.  >Comment By: Raymond Toy (rtoy) Date: 20100810 14:08 Message: They are not exactly 0.5 because of the way they're computed. %pi/6 and %pi/3 are converted to doublefloats and the Lisp function cl:sin and cl:cos are called to compute the result. Try float(sin(%pi/6)) and float(cos(%pi/3)). These return exactly 0.5 because maxima simplifies sin(%pi/6) to 1/2, and float converts that to a float.  Comment By: https://www.google.com/accounts () Date: 20100810 12:23 Message: There is also a problem in numerical evaluation of sin(%pi/6) and cos(%pi/3): (%i1) sin(%pi/6),numer; (%o1) .4999999999999999 (%i2) cos(%pi/3),numer; (%o2) .5000000000000001 Why aren't they 0.5? It is not a big error, but it should be fixed  Comment By: Raymond Toy (rtoy) Date: 20100716 22:16 Message: This is really a feature request, not a bug. Having said that, I have some code to handle this and other cases like %pi/3/2^m and %pi/5/2^m.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3030806&group_id=4933 
From: SourceForge.net <noreply@so...>  20100811 13:14:09

Bugs item #3030806, was opened at 20100717 02:07 Message generated for change (Comment added) made by You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3030806&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  Trigonometry Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: no exact result sin(%pi/12) Initial Comment: Maxima doesn't count exact result of sin(%pi/12) or cos(%pi/12), etc. despite the fact it's simple. It is (sqrt(3)1)/2*sqrt(2)  or (in other form): (sqrt(6)sqrt(2))/4.  Comment By: https://www.google.com/accounts () Date: 20100811 15:14 Message: Thank you!  Comment By: Raymond Toy (rtoy) Date: 20100810 20:08 Message: They are not exactly 0.5 because of the way they're computed. %pi/6 and %pi/3 are converted to doublefloats and the Lisp function cl:sin and cl:cos are called to compute the result. Try float(sin(%pi/6)) and float(cos(%pi/3)). These return exactly 0.5 because maxima simplifies sin(%pi/6) to 1/2, and float converts that to a float.  Comment By: https://www.google.com/accounts () Date: 20100810 18:23 Message: There is also a problem in numerical evaluation of sin(%pi/6) and cos(%pi/3): (%i1) sin(%pi/6),numer; (%o1) .4999999999999999 (%i2) cos(%pi/3),numer; (%o2) .5000000000000001 Why aren't they 0.5? It is not a big error, but it should be fixed  Comment By: Raymond Toy (rtoy) Date: 20100717 04:16 Message: This is really a feature request, not a bug. Having said that, I have some code to handle this and other cases like %pi/3/2^m and %pi/5/2^m.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3030806&group_id=4933 
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