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1

2

3

4

5

6
(6) 
7

8
(2) 
9

10
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11
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12
(2) 
13
(5) 
14
(3) 
15
(4) 
16
(4) 
17
(1) 
18
(2) 
19
(2) 
20
(1) 
21
(3) 
22
(3) 
23
(1) 
24

25

26
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27
(1) 
28
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29
(1) 
30
(2) 
31





From: SourceForge.net <noreply@so...>  20060130 22:36:11

Bugs item #1385307, was opened at 20051219 08:41 Message generated for change (Comment added) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1385307&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: Open Resolution: None Priority: 5 Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: 2*2^k doesn't simplify Initial Comment: a*a^k => a^(k+1) OK but 2*2^k => 2*2^k ??? Is this intentional behavior (under control of one of our wonderfully obscure switches)? Or a bug? Maxima 5.9.2 http://maxima.sourceforge.net Using Lisp GNU Common Lisp (GCL) GCL 2.6.7 (aka GCL)  Comment By: Nobody/Anonymous (nobody) Date: 20060130 14:36 Message: Logged In: NO May be subst(2,a,a*a^k);  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1385307&group_id=4933 
From: SourceForge.net <noreply@so...>  20060130 20:31:25

Bugs item #1419046, was opened at 20060130 14:31 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=1419046&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: Open Resolution: None Priority: 5 Submitted By: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: sign bug Initial Comment: (%i14) 1sqrt(1x); (%o14) 1sqrt(1x) (%i15) x * diff(%,x)/%; (%o15) x/(2*(1sqrt(1x))*sqrt(1x)) (%i16) abs(%); Yeechs! numerator is x. (%o16) x/(2*abs(sqrt(1x)1)*sqrt(1x)) Let's check the sign at 0.1 (%i17) subst(x=0.1,%); (%o17) 0.97673129462279451 Try again using cabs; this looks OK: (%i18) 1sqrt(1x); (%o18) 1sqrt(1x) (%i19) x * diff(%,x)/%; (%o19) x/(2*(1sqrt(1x))*sqrt(1x)) (%i20) cabs(%); Is x  1 positive, negative, or zero? neg; (%o20) abs(x)/abs(2*x+2*sqrt(1x)2) Let's try again  this time I'll trace sign (%i23) x * diff(%,x)/%; (%o23) x/(2*(1sqrt(1x))*sqrt(1x)) (%i24) abs(%); 1 Enter sign [x/(2*(1sqrt(1x))*sqrt(1x))] 1 Exit sign pn 1 Enter sign [1/(1sqrt(1x))] 1 Exit sign pn 1 Enter sign [1sqrt(1x)] 1 Exit sign pn 1 Enter sign [1/sqrt(1x)] 1 Exit sign pos 1 Enter sign [x] 1 Exit sign pos < bogus (%i30) build_info(); Maxima version: 5.9.2.19cvs Maxima build date: 10:34 1/27/2006 host type: i686pcmingw32 lispimplementationtype: GNU Common Lisp (GCL) lispimplementationversion: GCL 2.6.7 Barton  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1419046&group_id=4933 