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From: SourceForge.net <noreply@so...>  20090602 23:07:30

Bugs item #1899352, was opened at 20080222 06:47 Message generated for change (Comment added) made by crategus You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1899352&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: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: Alex Ghitza (aghitza) Assigned to: Nobody/Anonymous (nobody) Summary: integrate asks about (y1)(y+1) after assume(y^2>1) Initial Comment: Here is the problematic session: Maxima 5.13.0 http://maxima.sourceforge.net Using Lisp CLISP 2.41 (20061013) Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. This is a development version of Maxima. The function bug_report() provides bug reporting information. (%i1) assume(y^2>1); 2 (%o1) [y > 1] (%i2) integrate(log(x^2+y^2),x,0.0001414,1.); `rat' replaced 0.9998586 by 7071/7072 = .9998585972850679 `rat' replaced 1.414E4 by 81/572843 = 1.413999996508642E4 `rat' replaced 0.9998586 by 7071/7072 = .9998585972850679 `rat' replaced 0.9998586 by 7071/7072 = .9998585972850679 `rat' replaced 1.414E4 by 81/572843 = 1.413999996508642E4 `rat' replaced 0.9998586 by 7071/7072 = .9998585972850679 `rat' replaced 0.9998586 by 7071/7072 = .9998585972850679 `rat' replaced 1.414E4 by 81/572843 = 1.413999996508642E4 `rat' replaced 0.9998586 by 7071/7072 = .9998585972850679 Is (y  1) (y + 1) positive, negative, or zero? positive; 2 2 Is y + x + 2 x + 1 positive or negative? positive; 2 2 1 (%o2)  1.414E4 log(1.0 y + 1.999396E8) + log(y + 1) + 2 atan() y y 1.414E4  2.0 atan() y  1.9997172 y (%i3)  >Comment By: Dieter Kaiser (crategus) Date: 20090603 01:07 Message: After the last changes to the code of rectform and absarg in rpart.lisp we now get: (%i4) integrate(log(x^2+y^2),x,0,1); (%o4) log(y^2+1)+2*atan(1/y)*y2 We no longer get a question for this type of integral. The example above has a different lower value for the integral and works too: (%i5) integrate(log(x^2+y^2),x,0.0001414,1); (%o5) 1.414E4*log(1.0*y^2+1.999396E8)+log(y^2+1)+2*atan(1/y)*y 2.0*atan(1.414E4/y)*y1.9997172 Closing this bug report as fixed. Dieter Kaiser  Comment By: Raymond Toy (rtoy) Date: 20080222 15:16 Message: Logged In: YES user_id=28849 Originator: NO Note that is((y1)*(y+1)>0) returns unknown. If you say assume(y>1), integrate doesn't ask about that anymore. But it still asks about y^2+x^2+2*x+1. It should know that x > 0 and y > 0 here.  Comment By: Raymond Toy (rtoy) Date: 20080222 15:16 Message: Logged In: YES user_id=28849 Originator: NO Note that is((y1)*(y+1)>0) returns unknown. If you say assume(y>1), integrate doesn't ask about that anymore. But it still asks about y^2+x^2+2*x+1. It should know that x > 0 and y > 0 here.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1899352&group_id=4933 
From: SourceForge.net <noreply@so...>  20090602 23:02:21

Bugs item #1731624, was opened at 20070605 21:05 Message generated for change (Comment added) made by crategus You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1731624&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  Integration Group: None >Status: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: Sanjoy Mahajan (sm324) Assigned to: Nobody/Anonymous (nobody) Summary: asked about sign of yx in integral containing only z Initial Comment: Entering integrate(exp(sqrt(z^3)),z,0,1); produces Is yx positive or negative? But there is no yx in the integrand. I thought maxima might have an implicit rule about z = x + iy, so I tried the integral using q as the variable instead of z, but the same question was asked. Maxima version: 5.12.0 Maxima build date: 3:18 5/23/2007 host type: i686pclinuxgnu lispimplementationtype: GNU Common Lisp (GCL) lispimplementationversion: GCL 2.6.7 (it's the Ubuntu 5.12.01ubuntu1 package from the upcoming release of Ubuntu recompiled on my Ubuntu feisty system).  >Comment By: Dieter Kaiser (crategus) Date: 20090603 01:02 Message: After some changes to the code of rectform and friends we now get: (%i2) integrate(exp(sqrt(z^3)),z,0,1); (%o2) (sqrt(3)*%i+1)*(gamma(2/3)gamma_incomplete(2/3,1))/3 We do not get any questions and a result in terms of the gamma_incomplete function. The further examples don't problems too: (%i1) integrate(exp(sqrt(x)),x,1,5); (%o1) 2*(sqrt(5)1)*%e^sqrt(5) (%i3) limit(x*(1x*log(11/x)),x,0); (%o3) 0 Closing this bug report as fixed. Dieter Kaiser  Comment By: Nobody/Anonymous (nobody) Date: 20071212 16:43 Message: Logged In: NO This is likely the same problem, but I am not completely sure, so I decided to add this as a comment here rather than open a new bug report. Entering: limit(x*(1  x*log(1 + 1/x)),x,0); produces Is x + 1 positive or negative? There are two things wrong with this 1) When x > 0 then x+1 is clearly always positive. Presumably the intended question was "Is x positive or negative?" 2) The value of the limit does not depend on the sign of x, it is 0 in either case. Maxima version: 5.13.99rc1 Maxima build date: 21:11 12/3/2007 host type: i686redhatlinuxgnu lispimplementationtype: CLISP lispimplementationversion: 2.39 (20060716) (built on boulder.infotility.com [192.168.0.23]) (standard rpm from Sourceforge)  Comment By: Robert Dodier (robert_dodier) Date: 20070717 22:10 Message: Logged In: YES user_id=501686 Originator: NO Another example (from the mailing list): integrate( exp( sqrt(x) ), x, 1, 5); => Is yx positive or negative?  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1731624&group_id=4933 
From: SourceForge.net <noreply@so...>  20090602 19:50:20

Bugs item #2800183, was opened at 20090602 19:50 Message generated for change (Tracker Item Submitted) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2800183&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  Complex Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Doesn't Correctly simplify for X in the following: Initial Comment: %e^(%i*%x) = 1 solve for x yields x = %i * log(1) which is correct...but log(1) should simplify to %i*%pi when multiplied * %i should yield %pi.... It really isn't correct though as x could equal %pi, 3*%pi, 5*%pi, 7*pi etc... I am not a mathematician or anything..but I think this is right...get a mathmatician to concur...I am basing this on Euler's Identity btw.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2800183&group_id=4933 
From: SourceForge.net <noreply@so...>  20090602 16:34:16

Bugs item #2800086, was opened at 20090602 16:34 Message generated for change (Tracker Item Submitted) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2800086&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 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: echelon problem Initial Comment: Maxima version: 5.18.1 Maxima build date: 20:57 4/19/2009 host type: i686pcmingw32 lispimplementationtype: GNU Common Lisp (GCL) lispimplementationversion: GCL 2.6.8 I typed in the following commands in Maxima: (%i1) A:matrix([1,2,2,b1],[2,2,3,b2],[3,4,5,b3]); [ 1 2 2 b1 ] [ ] (%o1) [ 2 2 3 b2 ] [ ] [ 3 4 5 b3 ] (%i2) echelon(A); [ 1 2 2 b1 ] [ ] [ 1 b2  2 b1 ] (%o2) [ 0 1    ] [ 2 2 ] [ ] [ 0 0 0 1 ] (%i3) algebraic:true; (%o3) true (%i4) echelon(A); [ 1 2 2 b1 ] [ ] [ 1 b2  2 b1 ] (%o4) [ 0 1    ] [ 2 2 ] [ ] [ 0 0 0 1 ] But shouldn't the result be: [ 1 2 2 b1 ] [ ] [ 1 b2  2 b1 ] [ 0 1    ] [ 2 2 ] [ ] [ 0 0 0 b2  b3 + b1 ]  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2800086&group_id=4933 
From: SourceForge.net <noreply@so...>  20090602 05:36:10

Bugs item #2794173, was opened at 20090519 20:12 Message generated for change (Comment added) made by robert_dodier You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2794173&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: Documentation Group: Includes proposed fix >Status: Closed >Resolution: Fixed Priority: 5 Private: No Submitted By: Christopher White (chrisdwhite) Assigned to: Nobody/Anonymous (nobody) Summary: Manpage gives incorrect website Initial Comment: The last line of the manpage gives the website as "<http://maxima.sourcforge.net>";, when it should be <http://maxima.sourceforge.net>;. I've attached a patch.  >Comment By: Robert Dodier (robert_dodier) Date: 20090601 23:36 Message: I've corrected the error. Thanks for pointing it out. Closing this report as fixed.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2794173&group_id=4933 