From: SourceForge.net <noreply@so...>  20070605 19:05:08

Bugs item #1731624, was opened at 20070605 19:05 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=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: Open Resolution: None 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).  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1731624&group_id=4933 
From: SourceForge.net <noreply@so...>  20070717 20:10:38

Bugs item #1731624, was opened at 20070605 13:05 Message generated for change (Comment added) made by robert_dodier 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: Open Resolution: None 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: Robert Dodier (robert_dodier) Date: 20070717 14:10 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...>  20071212 15:43:25

Bugs item #1731624, was opened at 20070605 12:05 Message generated for change (Comment added) made by nobody 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: Open Resolution: None 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: Nobody/Anonymous (nobody) Date: 20071212 07:43 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 13:10 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 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 