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From: SourceForge.net <noreply@so...>  20031112 17:36:30

Bugs item #840848, was opened at 20031112 12:36 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=840848&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: trigexpand doesn't enter unknown functions Initial Comment: trigexpand(f(sin(x)^2)) returns f(sin(x)^2). That is, it doesn't recurse into the arguments of unknown functions. Compare with trigreduce(f(sin(2*x))). Why the discrepancy? If there is a good reason (which I doubt), this behavior should at least be documented, recommending the use of scanmap. I discovered this when trying to simplify an expression involving atan2(...sin(x)^2+cos(x)^2...). Not even atan2 is considered a 'known' function here....  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=840848&group_id=4933 
From: SourceForge.net <noreply@so...>  20031112 14:49:54

Bugs item #836780, was opened at 20031105 15:55 Message generated for change (Comment added) made by macrakis You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=836780&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: taylor(acosh(x),x,1,1) Initial Comment: The following is wrong: (C1) taylor(acosh(x),x,1,1); (D1) (%PI2*LOG(SQRT(2)+1))/2SQRT(2)*(x1)/2 Converting to log form, we do better  it's correct, I believe. But the result isn't simplified. (C2) taylor(logarc(acosh(x)),x,1,1); (D2) +SQRT(2)*SQRT(x1) (C3) ?print(%); ((MRAT SIMP (((MEXPT RATSIMP) 2 ((RAT) 1 2)) ((%LOG SIMP) ((MPLUS SIMP) $x ((MEXPT SIMP) ((MPLUS SIMP) 1 ((MEXPT SIMP) $x 2)) ((RAT) 1 2)))) ((MPLUS SIMP) 1 $x)) (#:2^(1/2)21846 #:LOG(SQRT(2)+1)21846 #:2^(1/2)21846 #:%PI21846 #:ACOSH(x)21846 #:x21846) (($x ((1 . 1)) 1 NIL #:2^(1/2)21846 . 2)) TRUNC) PS (#:2^(1/2)21846 . 2) ((1 . 1)) ((1 . 2) (#:2^(1/2)21846 1 1) . 1)) (D3) +SQRT(2)*SQRT(x1) (C4) Barton  >Comment By: Stavros Macrakis (macrakis) Date: 20031112 09:49 Message: Logged In: YES user_id=588346 The leading '+' in Taylor series is a property (bug?) of 1d display. Compare string(taylor(1,x,0,0)) => +1  Comment By: Barton Willis (willisbl) Date: 20031112 09:41 Message: Logged In: YES user_id=895922 No, I wasn't bothered by the unnecessary ratvars; rather, I was puzzled by the leading '+' in the result: +SQRT(2)*SQRT(x1) < why +sqrt(2) ...? Maybe the leading '+' is harmless; however, it's unusual. Barton  Comment By: Stavros Macrakis (macrakis) Date: 20031110 15:19 Message: Logged In: YES user_id=588346 This was already reported in bug report # 623165. I am not sure what you mean by "the result isn't simplified". Are you thinking that the unnecessary ratvars are a problem? That is the usual way that CREs work: in a fresh Maxima, try (?print(rat(x)), ?print(rat(y)), ?print(rat(x)) )$  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=836780&group_id=4933 
From: SourceForge.net <noreply@so...>  20031112 14:41:54

Bugs item #836780, was opened at 20031105 14:55 Message generated for change (Comment added) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=836780&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: taylor(acosh(x),x,1,1) Initial Comment: The following is wrong: (C1) taylor(acosh(x),x,1,1); (D1) (%PI2*LOG(SQRT(2)+1))/2SQRT(2)*(x1)/2 Converting to log form, we do better  it's correct, I believe. But the result isn't simplified. (C2) taylor(logarc(acosh(x)),x,1,1); (D2) +SQRT(2)*SQRT(x1) (C3) ?print(%); ((MRAT SIMP (((MEXPT RATSIMP) 2 ((RAT) 1 2)) ((%LOG SIMP) ((MPLUS SIMP) $x ((MEXPT SIMP) ((MPLUS SIMP) 1 ((MEXPT SIMP) $x 2)) ((RAT) 1 2)))) ((MPLUS SIMP) 1 $x)) (#:2^(1/2)21846 #:LOG(SQRT(2)+1)21846 #:2^(1/2)21846 #:%PI21846 #:ACOSH(x)21846 #:x21846) (($x ((1 . 1)) 1 NIL #:2^(1/2)21846 . 2)) TRUNC) PS (#:2^(1/2)21846 . 2) ((1 . 1)) ((1 . 2) (#:2^(1/2)21846 1 1) . 1)) (D3) +SQRT(2)*SQRT(x1) (C4) Barton  >Comment By: Barton Willis (willisbl) Date: 20031112 08:41 Message: Logged In: YES user_id=895922 No, I wasn't bothered by the unnecessary ratvars; rather, I was puzzled by the leading '+' in the result: +SQRT(2)*SQRT(x1) < why +sqrt(2) ...? Maybe the leading '+' is harmless; however, it's unusual. Barton  Comment By: Stavros Macrakis (macrakis) Date: 20031110 14:19 Message: Logged In: YES user_id=588346 This was already reported in bug report # 623165. I am not sure what you mean by "the result isn't simplified". Are you thinking that the unnecessary ratvars are a problem? That is the usual way that CREs work: in a fresh Maxima, try (?print(rat(x)), ?print(rat(y)), ?print(rat(x)) )$  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=836780&group_id=4933 