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From: SourceForge.net <noreply@so...>  20060611 22:24:57

Bugs item #1504505, was opened at 20060611 18:24 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=1504505&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: integrate( 1/(x^81),x,0,1/2) => internal error Initial Comment: integrate( 1/(x^81), x, 0, 1/2 ) => Divison by 0 Smaller exponents don't cause problem. Same problem with gcd: spmod. Using the indefiniteintegral at the limits works fine. 5.9.3 gcl windows  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1504505&group_id=4933 
From: SourceForge.net <noreply@so...>  20060611 21:44:50

Bugs item #1504361, was opened at 20060611 09:38 Message generated for change (Comment added) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1504361&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: Invalid Priority: 5 Submitted By: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: outative too eager Initial Comment: (%i1) declare(f,outative)$ (%i2) f(a); (%o2) f(a) < OK (%i3) f(a,b); (%o3) f(1,b)*a < not OK Since a is nonconstant, outativity shouldn't be applied to f(a,b); thus %o3 should be f(a,b). Barton  >Comment By: Barton Willis (willisbl) Date: 20060611 16:44 Message: Logged In: YES user_id=895922 OK; now I understand. I'll close my bug report.  Comment By: Robert Dodier (robert_dodier) Date: 20060611 13:37 Message: Logged In: YES user_id=501686 Barton, the observed behaviour is broken as designed. Dunno if we want to close this report or change it to a request to change outative. Here is the current description, which is adapted from the 5.9.1 documentation (i.e., it is not the result of inferring the description from the observed behavior).  Declaration: outative `declare (f, outative)' tells the Maxima simplifier that constant factors in the argument of `f' can be pulled out. 1. If `f' is univariate, whenever the simplifier encounters `f' applied to a product, that product will be partitioned into factors that are constant and factors that are not and the constant factors will be pulled out. E.g., `f(a*x)' will simplify to `a*f(x)' where `a' is a constant. Nonatomic constant factors will not be pulled out. 2. If `f' is a function of 2 or more arguments, outativity is defined as in the case of `sum' or `integrate', i.e., `f (a*g(x), x)' will simplify to `a * f(g(x), x)' for `a' free of `x'. `sum', `integrate', and `limit' are all `outative'.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1504361&group_id=4933 
From: SourceForge.net <noreply@so...>  20060611 21:41:57

Bugs item #1504495, was opened at 20060611 14:41 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=1504495&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: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: outativity and noncommutative mult Initial Comment: (%i1) declare(f,outative, a, constant); (%o1) done (%i2) f(a.x); (%o2) a*f(x) < huh? I don't think outative should consider a.x as a product; thus $o2 should be f(a.x). Correct? Barton  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1504495&group_id=4933 
From: SourceForge.net <noreply@so...>  20060611 18:47:04

Bugs item #1504146, was opened at 20060610 17:59 Message generated for change (Comment added) made by macrakis You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1504146&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  Assume Group: None Status: Open Resolution: None Priority: 5 Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: taylor asks pn? when expr is zero Initial Comment: taylor( asin( ( cos(x+a)^2 + sin(x)^21 ) / a), a, 0, 2) asks whether sin(x)^2+cos(x)^21 is positive or negative, where of course it is identically zero.  >Comment By: Stavros Macrakis (macrakis) Date: 20060611 14:47 Message: Logged In: YES user_id=588346 It would be OK if taylor/asksign asked if the expression was pnz, because the user could answer z (there will always be some cases that asksign can't handle, after all). The problem is that taylor/asksign is asking if it is pn, not giving the user the possibility of answering z.  Comment By: Robert Dodier (robert_dodier) Date: 20060611 14:30 Message: Logged In: YES user_id=501686 I don't think the bug is in taylor; reassigning the category to "Lisp Core  Assume". Feel free to change the category again. asksign (sin(x)^2+cos(x)^21); => Is sin(x)^2+cos(x)^21 pnz ? is(equal(sin(x)^2+cos(x)^21,0)); => Maxima was unable to evaluate the predicate I don't know how hard asksign and/or is and/or mevalp should try to simplify. trigsimp(sin(x)^2+cos(x)^21); => 0 but trigsimp isn't applied automatically.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1504146&group_id=4933 
From: SourceForge.net <noreply@so...>  20060611 18:46:36

Bugs item #1495041, was opened at 20060525 10:28 Message generated for change (Comment added) made by robert_dodier You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1495041&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: Wont Fix Priority: 5 Submitted By: Araceli GÃ¡rate GarcÃa (agarate) Assigned to: Nobody/Anonymous (nobody) Summary: A question about the rat command Initial Comment: Hi, This is only a question. I'm developping a software based in Maxima and I have to use the command rat. I know that rat(0) has a different internal representation than 0 but I would like to know if I could remove this property later, because I don't have troubles with polynomials or numbers: (%i90)if rat(5)=5 then(print(hi)); hi But it's not the same case with matrix (%i91) if rat(zeromatrix(2,2))=zeromatrix(2,2) then(hi); (%o91) false Thank you in advance Araceli  >Comment By: Robert Dodier (robert_dodier) Date: 20060611 12:46 Message: Logged In: YES user_id=501686 Not a bug, closing accordingly.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1495041&group_id=4933 
From: SourceForge.net <noreply@so...>  20060611 18:41:11

Bugs item #1385311, was opened at 20051219 09:46 Message generated for change (Comment added) made by robert_dodier You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1385311&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: Share Libraries Group: None >Status: Closed >Resolution: Fixed Priority: 5 Submitted By: Stavros Macrakis (macrakis) Assigned to: Robert Dodier (robert_dodier) Summary: GosperSum(1+n^a) should use Ask Initial Comment: GosperSum(1+n^a,n,1,k); Maxima was unable to evaluate the predicate: max(a, 0) < 2 #0: integerLinear(expr=n^a+1,var=n) #1: intLinSep(expr=n^a+1,k=n)(norm.mac line 79) #2: makeGosperFormVerboseOpt(expr=((n+1)^a+1)/(n^a+1),k=n,mode=1)(makeGosperForm.mac line 148) GosperSum should be using Ask Maxima 5.9.2 http://maxima.sourceforge.net Using Lisp GNU Common Lisp (GCL) GCL 2.6.7 (aka GCL) load("zeilberger/loadzeilberger.mac");  >Comment By: Robert Dodier (robert_dodier) Date: 20060611 12:41 Message: Logged In: YES user_id=501686 Fixed by r1.6 share/contrib/Zeilberger/shiftQuotient.mac .  Comment By: Robert Dodier (robert_dodier) Date: 20060609 23:34 Message: Logged In: YES user_id=501686 Retesting against Zeilberger 4.0 (just committed). This bug has reappeared: (%i4) GosperSum(1+n^a,n,1,k); Maxima was unable to evaluate the predicate: max(a, 0) < 2 There is new code to attempt to detect nonsummable expressions in Gosper.mac, but I guess it misses this one. Reopening this report.  Comment By: Andrej Vodopivec (andrejv) Date: 20060413 16:13 Message: Logged In: YES user_id=1179910 Fixed in CVS. GosperSum returns nonGosper_summable. This is correct since the example is summable only if a is a fixed integer. Andrej  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1385311&group_id=4933 
From: SourceForge.net <noreply@so...>  20060611 18:37:37

Bugs item #1504361, was opened at 20060611 08:38 Message generated for change (Comment added) made by robert_dodier You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1504361&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: Open Resolution: None Priority: 5 Submitted By: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: outative too eager Initial Comment: (%i1) declare(f,outative)$ (%i2) f(a); (%o2) f(a) < OK (%i3) f(a,b); (%o3) f(1,b)*a < not OK Since a is nonconstant, outativity shouldn't be applied to f(a,b); thus %o3 should be f(a,b). Barton  >Comment By: Robert Dodier (robert_dodier) Date: 20060611 12:37 Message: Logged In: YES user_id=501686 Barton, the observed behaviour is broken as designed. Dunno if we want to close this report or change it to a request to change outative. Here is the current description, which is adapted from the 5.9.1 documentation (i.e., it is not the result of inferring the description from the observed behavior).  Declaration: outative `declare (f, outative)' tells the Maxima simplifier that constant factors in the argument of `f' can be pulled out. 1. If `f' is univariate, whenever the simplifier encounters `f' applied to a product, that product will be partitioned into factors that are constant and factors that are not and the constant factors will be pulled out. E.g., `f(a*x)' will simplify to `a*f(x)' where `a' is a constant. Nonatomic constant factors will not be pulled out. 2. If `f' is a function of 2 or more arguments, outativity is defined as in the case of `sum' or `integrate', i.e., `f (a*g(x), x)' will simplify to `a * f(g(x), x)' for `a' free of `x'. `sum', `integrate', and `limit' are all `outative'.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1504361&group_id=4933 
From: SourceForge.net <noreply@so...>  20060611 18:30:09

Bugs item #1504146, was opened at 20060610 15:59 Message generated for change (Settings changed) made by robert_dodier You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1504146&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  Assume Group: None Status: Open Resolution: None Priority: 5 Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: taylor asks pn? when expr is zero Initial Comment: taylor( asin( ( cos(x+a)^2 + sin(x)^21 ) / a), a, 0, 2) asks whether sin(x)^2+cos(x)^21 is positive or negative, where of course it is identically zero.  >Comment By: Robert Dodier (robert_dodier) Date: 20060611 12:30 Message: Logged In: YES user_id=501686 I don't think the bug is in taylor; reassigning the category to "Lisp Core  Assume". Feel free to change the category again. asksign (sin(x)^2+cos(x)^21); => Is sin(x)^2+cos(x)^21 pnz ? is(equal(sin(x)^2+cos(x)^21,0)); => Maxima was unable to evaluate the predicate I don't know how hard asksign and/or is and/or mevalp should try to simplify. trigsimp(sin(x)^2+cos(x)^21); => 0 but trigsimp isn't applied automatically.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1504146&group_id=4933 
From: SourceForge.net <noreply@so...>  20060611 14:38:49

Bugs item #1504361, was opened at 20060611 09:38 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=1504361&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: Open Resolution: None Priority: 5 Submitted By: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: outative too eager Initial Comment: (%i1) declare(f,outative)$ (%i2) f(a); (%o2) f(a) < OK (%i3) f(a,b); (%o3) f(1,b)*a < not OK Since a is nonconstant, outativity shouldn't be applied to f(a,b); thus %o3 should be f(a,b). Barton  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1504361&group_id=4933 