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From: SourceForge.net <noreply@so...>  20100213 21:58:07

Bugs item #767528, was opened at 20030708 06:12 Message generated for change (Comment added) made by crategus You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=767528&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 Private: No Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: op(box(a)) bogus Initial Comment: op(box(a)) => MBOX (internal name) i.e. ?mbox op(box(a,b)) => MLABOX (internal name) i.e. ?mlabox It is not clear how to fix this because $box is a function, and there are different operators for different numbers of args (why?). Anyway, it is not terribly important.  >Comment By: Dieter Kaiser (crategus) Date: 20100213 22:58 Message: Fixed in comm2.lisp revision 1.31. The results are (%i1) op(box(a)); (%o1) box (%i2) op(box(a,b)); (%o2) box (%i3) apply(op(box(a,b)),[x,y]); (%o3) box(x,y) Closing this bug report as fixed. Dieter Kaiser  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=767528&group_id=4933 
From: SourceForge.net <noreply@so...>  20100213 20:15:04

Bugs item #900860, was opened at 20040220 04:53 Message generated for change (Comment added) made by crategus You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=900860&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  Simplification Group: None >Status: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: Simplifications involving abs Initial Comment: abs(q)/q^2 and q^2/abs(q) currently don't simplify. These should simplify to 1/abs(q) and abs(q). This is especially useful since things like sqrt(q^2) simplify to abs(q). It would be even nicer if GCD understood this case, but I can understand that that would be harder, e.g. gcd(abs(q)+q^2,abs(q)) => 1+abs(q) This seems practically justifiable; is there any theoretical reason it might not be justifiable?  >Comment By: Dieter Kaiser (crategus) Date: 20100213 21:15 Message: The suggested simplifications have been implemented in simp.lisp revision 1.101. Closing this bug report as fixed. Dieter Kaiser  Comment By: Robert Dodier (robert_dodier) Date: 20060723 20:38 Message: Logged In: YES user_id=501686 Observed in 5.9.3cvs.  Comment By: Stavros Macrakis (macrakis) Date: 20050221 21:03 Message: Logged In: YES user_id=588346 abs(x)^(2*n+1) should simplify to x^(2*n)*abs(x), extending the current case where abs(x)^(2*n) simplifies to x^(2*n). This simple change makes (e.g.) abs(x)^3/x simplify with no further work.  Comment By: Stavros Macrakis (macrakis) Date: 20040222 22:16 Message: Logged In: YES user_id=588346 With declare(q,complex), q/abs(q) should presumably simplify to carg(q), except for the problems with that (620246, 902290). Assuming definition by continuity, q/abs(q) and carg (q) even have the same 'value' (ind) at q=0. With *real* r, r/abs(r) = signum(r) *except* at r=0, where the first is undefined, but the second is welldefined (=0).  Comment By: Barton Willis (willisbl) Date: 20040222 21:35 Message: Logged In: YES user_id=895922 When 'domain' is complex or q has been declared complex, the simplification abs(q) / q^2 > 1/abs(q) shouldn't happen. Barton  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=900860&group_id=4933 
From: SourceForge.net <noreply@so...>  20100213 02:20:20

Bugs item #2942553, was opened at 20100129 22:17 Message generated for change (Comment added) made by sfrobot You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2942553&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: None >Status: Closed Resolution: Invalid Priority: 5 Private: No Submitted By: Dieter Kaiser (crategus) Assigned to: Nobody/Anonymous (nobody) Summary: hgfred([n,n+1],[1],x) not correct Initial Comment: The result of hgfred([n,1+n],[1],x) is not correct. This is what Maxima gives: (%i1) res:hgfred([n,n+1],[1],x); Is x positive, negative, or zero? p; Is x1 positive, negative, or zero? n; (%o1) legendre_p(n1,12*x) The correct result is legendre_p(n, 12*x). For the special values n=1, n=2, n=3, ... Maxima gives the correct results: (%i2) hgfred([1,1+1],[1],x); (%o2) 12*x (%i3) hgfred([2,2+1],[1],x); (%o3) 6*x^26*x+1 (%i4) hgfred([3,3+1],[1],x); (%o4) 20*x^3+30*x^212*x+1 We can not reproduce the correct results, when we insert the special values in the result from above: (%i5) res,n=1; (%o5) 0 (%i6) res,n=2; (%o6) 0 (%i7) res,n=3; (%o7) 0 Furthermore, I think the question for the sign of the argument x is not necessary. The problem is in the algorithm of the routine legf14. Dieter Kaiser  >Comment By: SourceForge Robot (sfrobot) Date: 20100213 02:20 Message: This Tracker item was closed automatically by the system. It was previously set to a Pending status, and the original submitter did not respond within 14 days (the time period specified by the administrator of this Tracker).  Comment By: Dieter Kaiser (crategus) Date: 20100129 23:04 Message: Sorry, I have overseen the identity legendre_p(n1,x) = legendre_p(n,x). With this identity the result of hgfred might be not nice, but it is correct. Unfortunately, legendre_p(n1,x) does not simplify to correct values. Perhaps this might be called a bug. Setting the status to pending and the resolution to invalid. Dieter Kaiser  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2942553&group_id=4933 