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From: SourceForge.net <noreply@so...>  20110614 12:17:04

Bugs item #3315476, was opened at 20110612 19:21 Message generated for change (Comment added) made by aleksasd You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3315476&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 Private: No Submitted By: dstanislav (ssllvv) Assigned to: Nobody/Anonymous (nobody) Summary: definite integration Initial Comment: maxima24.0 (%i1) integrate(2^(x),x,0,1) (%o1) integrate(2^(x),x,0,1) i.e. integral is not calculate  Comment By: Aleksas (aleksasd) Date: 20110614 15:17 Message: 1 method: (%i1) integrate(2^(x),x,0,1); (%o1) integrate(1/2^x,x,0,1) (%i2) changevar(%, log(y)/log(2)=x, y, x); (%o2) integrate(1/y^2,y,1,2)/log(2) (%i3) ev(%, nouns); (%o3) 1/(2*log(2)) 2 method: (%i4) risch(1/2^x, x); (%o4) %e^(log(2)*x)/log(2) (%i5) ev(%,x=1)ev(%,x=0); (%o5) 1/(2*log(2)) (%i6) float(%); (%o6) 0.72134752044448 3 method: (%i7) quad_qags(1/2^x, x, 0, 1); (%o7) [0.72134752044448,8.008566259537295*10^15,21,0]  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3315476&group_id=4933 
From: SourceForge.net <noreply@so...>  20110614 08:13:40

Bugs item #3311100, was opened at 20110603 16:05 Message generated for change (Comment added) made by sergiopesenti You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311100&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  Plotting Group: None Status: Open Resolution: Fixed Priority: 5 Private: No Submitted By: sergio pesenti (sergiopesenti) Assigned to: Nobody/Anonymous (nobody) Summary: plot2d problem from 5.24.0 Initial Comment: The following plot does not execute in recent releases of MAXIMA. y(x):=log(abs(1/(1+exp(%i*x))))$ plot2d( y(x),[x,0.1,1])$ MAXIMA complains with "sign: argument cannot be imaginary; found %i" but works with MAXIMA 5.20.1  Comment By: sergio pesenti (sergiopesenti) Date: 20110614 10:13 Message: Thanks alex. It works fine. However, I had some other trouble while defining my functions with cabs. For instance, the code simp:false$ define(y(x),log(cabs(1/(1+exp(%i*x)))))$ simp:true$ y(1.0); does not evaluate completely the numerical value. But it works if I use ":=" to define the function. Here the code simp:false$ y(x):=log(cabs(1/(1+exp(%i*x))))$ simp:true$ y(1.0); evaluates perfectly. I actually need to set "simp" to "false" because the expressions I deal with in my real case are quite complicated. I need to prevent a simplification at this stage to avoid MAXIMA to start an endless evaluation while defining my expressions.  Comment By: Aleksas (aleksasd) Date: 20110607 23:18 Message: abs change to cabs: y(x):=log(cabs(1/(1+exp(%i*x))))$ plot2d( y(x),[x,0.1,1])$ work with maxima 5.24.0  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311100&group_id=4933 
From: SourceForge.net <noreply@so...>  20110614 08:11:52

Bugs item #3311100, was opened at 20110603 16:05 Message generated for change (Settings changed) made by sergiopesenti You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311100&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  Plotting Group: None Status: Open >Resolution: Fixed Priority: 5 Private: No Submitted By: sergio pesenti (sergiopesenti) Assigned to: Nobody/Anonymous (nobody) Summary: plot2d problem from 5.24.0 Initial Comment: The following plot does not execute in recent releases of MAXIMA. y(x):=log(abs(1/(1+exp(%i*x))))$ plot2d( y(x),[x,0.1,1])$ MAXIMA complains with "sign: argument cannot be imaginary; found %i" but works with MAXIMA 5.20.1  Comment By: Aleksas (aleksasd) Date: 20110607 23:18 Message: abs change to cabs: y(x):=log(cabs(1/(1+exp(%i*x))))$ plot2d( y(x),[x,0.1,1])$ work with maxima 5.24.0  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311100&group_id=4933 
From: SourceForge.net <noreply@so...>  20110612 20:23:06

Bugs item #3168479, was opened at 20110131 04:00 Message generated for change (Settings changed) made by van_nek You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3168479&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 Private: No Submitted By: jrredford (jrredford) Assigned to: Nobody/Anonymous (nobody) Summary: ?? and describe() aren't working Initial Comment: describe() and ?? aren't working: (%i1) describe(integrate); WARNING: Empty documentation index. Describe command will not work! No exact match found for topic `integrate'. Try `?? integrate' (inexact match) instead. (%o1) false (%i2) ?? integrate; (%o2) false Below is the Maxima version that I'm using: Maxima version: 5.23.2 Maxima build date: 17:9 1/17/2011 Host type: i686pcmingw32 Lisp implementation type: GNU Common Lisp (GCL) Lisp implementation version: GCL 2.6.8  >Comment By: Volker van Nek (van_nek) Date: 20110612 22:23 Message: I have to reopen this bug report. My observation: volker@...:~$ maxima Maxima 5.24.0 http://maxima.sourceforge.net using Lisp SBCL 1.0.45.0.debian Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. The function bug_report() provides bug reporting information. (%i1) ?? integrate Maxima encountered a Lisp error: Couldn't load #P"/usr/share/info/./maximaindex.lisp": file does not exist. Automatically continuing. To enable the Lisp debugger set *debuggerhook* to nil. ; ; compilation unit aborted ; caught 1 fatal ERROR condition (%i2) quit()$ maximaindex.lisp is located at a different place: volker@...:~$ find /usr/share/ name maximaindex.lisp /usr/share/doc/maximadoc/info/maximaindex.lisp Volker van Nek  Comment By: Dieter Kaiser (crategus) Date: 20110217 22:29 Message: This bug is no longer present, because of the filerelease: 20110217 18:54:02 CET by andrejv Closing this bug report as fixed. Dieter Kaiser  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3168479&group_id=4933 
From: SourceForge.net <noreply@so...>  20110612 16:21:01

Bugs item #3315476, was opened at 20110612 19:21 Message generated for change (Tracker Item Submitted) made by ssllvv You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3315476&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 Private: No Submitted By: dstanislav (ssllvv) Assigned to: Nobody/Anonymous (nobody) Summary: definite integration Initial Comment: maxima24.0 (%i1) integrate(2^(x),x,0,1) (%o1) integrate(2^(x),x,0,1) i.e. integral is not calculate  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3315476&group_id=4933 
From: SourceForge.net <noreply@so...>  20110611 00:15:43

Bugs item #3314756, was opened at 20110610 10:48 Message generated for change (Settings changed) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3314756&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  Solving equations Group: None >Status: Pending >Resolution: Fixed Priority: 5 Private: No Submitted By: https://www.google.com/accounts () Assigned to: Nobody/Anonymous (nobody) Summary: solve function causes maxima error solving simple equation Initial Comment: Trying to solve very simple equation x^3x*4=0 (which roots are 2, 0, 2) with solve([x^3x*4=0], [x]); revived: Universal error handler called recursively (:ERROR NIL CONDITIONS::CLCSUNIVERSALERRORHANDLER "" "Couldn't protect") Universal error handler called recursively (:ERROR NIL CONDITIONS::CLCSUNIVERSALERRORHANDLER "" "Couldn't protect") Maxima encountered a Lisp error: Error in CONDITIONS::CLCSUNIVERSALERRORHANDLER [or a callee]: Caught fatal error [memory may be damaged] Automatically continuing. To reenable the Lisp debugger set *debuggerhook* to nil. (%i2) bug_report()$ The Maxima bug database is available at http://sourceforge.net/tracker/?atid=104933&group_id=4933&func=browse Submit bug reports by following the 'Submit New' link on that page. Please include the following build information with your bug report:  Maxima version: 5.17.1 Maxima build date: 14:9 7/13/2009 host type: i686pclinuxgnu lispimplementationtype: GNU Common Lisp (GCL) lispimplementationversion: GCL 2.6.7   >Comment By: Barton Willis (willisbl) Date: 20110610 19:15 Message: This bug is has been fixed; (%i1) solve([x^3x*4=0], [x]); (%o1) [x=2,x=2,x=0] (%i2) build_info(); Maxima version: 5.24.0 Maxima build date: 20:39 4/5/2011 Host type: i686pcmingw32 Lisp implementation type: GNU Common Lisp (GCL) Lisp implementation version: GCL 2.6.8 (%o2)  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3314756&group_id=4933 
From: SourceForge.net <noreply@so...>  20110610 15:48:43

Bugs item #3314756, was opened at 20110610 18:48 Message generated for change (Tracker Item Submitted) made by You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3314756&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  Solving equations Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: https://www.google.com/accounts () Assigned to: Nobody/Anonymous (nobody) Summary: solve function causes maxima error solving simple equation Initial Comment: Trying to solve very simple equation x^3x*4=0 (which roots are 2, 0, 2) with solve([x^3x*4=0], [x]); revived: Universal error handler called recursively (:ERROR NIL CONDITIONS::CLCSUNIVERSALERRORHANDLER "" "Couldn't protect") Universal error handler called recursively (:ERROR NIL CONDITIONS::CLCSUNIVERSALERRORHANDLER "" "Couldn't protect") Maxima encountered a Lisp error: Error in CONDITIONS::CLCSUNIVERSALERRORHANDLER [or a callee]: Caught fatal error [memory may be damaged] Automatically continuing. To reenable the Lisp debugger set *debuggerhook* to nil. (%i2) bug_report()$ The Maxima bug database is available at http://sourceforge.net/tracker/?atid=104933&group_id=4933&func=browse Submit bug reports by following the 'Submit New' link on that page. Please include the following build information with your bug report:  Maxima version: 5.17.1 Maxima build date: 14:9 7/13/2009 host type: i686pclinuxgnu lispimplementationtype: GNU Common Lisp (GCL) lispimplementationversion: GCL 2.6.7   You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3314756&group_id=4933 
From: SourceForge.net <noreply@so...>  20110609 19:55:54

Bugs item #3313531, was opened at 20110607 23:22 Message generated for change (Comment added) made by dgildea You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3313531&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: https://www.google.com/accounts () Assigned to: Nobody/Anonymous (nobody) Summary: integral from minf to inf of an absolute value combo fails Initial Comment: Maxima 5.24.0 http://maxima.sourceforge.net using Lisp SBCL 1.0.24 Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. The function bug_report() provides bug reporting information. (%i1) integrate(abs(x  1) + abs(x + 1)  2*abs(x),x,minf,10); (%o1) 2 (%i2) integrate(abs(x  1) + abs(x + 1)  2*abs(x),x,minf,inf); (%o2) 0 The answer should be 2 for ANY interval containing [1,1]. Interestingly, it seems to work for every combination of inf/minf and numbers, but not for minf to inf  that seems to be the only failing example. See original report at http://trac.sagemath.org/sage_trac/ticket/11445.  >Comment By: Dan Gildea (dgildea) Date: 20110609 15:55 Message: Fixed in defint.lisp master branch.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3313531&group_id=4933 
From: SourceForge.net <noreply@so...>  20110609 19:55:11

Bugs item #1664729, was opened at 20070220 18:00 Message generated for change (Comment added) made by dgildea You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1664729&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: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: integrate(sin(x)cos(x),x,0,inf) wrong Initial Comment: integrate(sin(x)cos(x),x,0,inf) => 0 (!!!) This seems to be caused by: integrate(sin(x),x,0,inf) => IND I suppose this could be interpreted as correct, but integrate is supposed to give an "Integral is divergent" error, as it still does in other cases, e.g. integrate(1/x,x,0,inf). And then, IND doesn't simplify properly, so you get nonsense like integrate(sin(x)cos(x),x,0,inf) => 0 (from INDIND) Along the same lines, integrate(sin(x^2)*x,x,0,inf) charmingly gives ind+1/2, which is sort of right, but didn't simplify to ind. 5.11.0 GCL 2.6.8 Windows 2k  >Comment By: Dan Gildea (dgildea) Date: 20110609 15:55 Message: Fixed in defint.lisp master branch. Now: (%i2) integrate(sin(x), x, 0, inf); (%o2) 'integrate(sin(x),x,0,inf) (%i3) integrate(cos(x), x, 0, inf); (%o3) 'integrate(cos(x),x,0,inf) (%i4) integrate(sin(x)cos(x), x, 0, inf); defint: integral is divergent.  an error. To debug this try: debugmode(true);  Comment By: Raymond Toy (rtoy) Date: 20070222 14:26 Message: Logged In: YES user_id=28849 Originator: NO Don't know about the conventions, but rev 1.1 of defint.lisp shows that scaxn returns ind. However, I don't know if the original version computes this integral via scaxn. I assume it did. (We really need to make ind, inf, minf, und, and friends contagious.)  Comment By: Stavros Macrakis (macrakis) Date: 20070222 13:45 Message: Logged In: YES user_id=588346 Originator: YES Re > integrate(sin(x),x,0,inf) returns ind because scaxn returns ind. A quick look at the code seems to show that it's prepared to handle IND when returned by LIMIT (takeprincipal etc.), but it doesn't generate it internally. Perhaps this is new code that doesn't follow defint's conventions?  Comment By: Raymond Toy (rtoy) Date: 20070222 12:26 Message: Logged In: YES user_id=28849 Originator: NO integrate(sin(x),x,0,inf) returns ind because scaxn returns ind.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1664729&group_id=4933 
From: SourceForge.net <noreply@so...>  20110608 03:22:39

Bugs item #3313531, was opened at 20110608 03:22 Message generated for change (Tracker Item Submitted) made by You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3313531&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: https://www.google.com/accounts () Assigned to: Nobody/Anonymous (nobody) Summary: integral from minf to inf of an absolute value combo fails Initial Comment: Maxima 5.24.0 http://maxima.sourceforge.net using Lisp SBCL 1.0.24 Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. The function bug_report() provides bug reporting information. (%i1) integrate(abs(x  1) + abs(x + 1)  2*abs(x),x,minf,10); (%o1) 2 (%i2) integrate(abs(x  1) + abs(x + 1)  2*abs(x),x,minf,inf); (%o2) 0 The answer should be 2 for ANY interval containing [1,1]. Interestingly, it seems to work for every combination of inf/minf and numbers, but not for minf to inf  that seems to be the only failing example. See original report at http://trac.sagemath.org/sage_trac/ticket/11445.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3313531&group_id=4933 
From: SourceForge.net <noreply@so...>  20110607 21:18:18

Bugs item #3311100, was opened at 20110603 17:05 Message generated for change (Comment added) made by aleksasd You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311100&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  Plotting Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: sergio pesenti (sergiopesenti) Assigned to: Nobody/Anonymous (nobody) Summary: plot2d problem from 5.24.0 Initial Comment: The following plot does not execute in recent releases of MAXIMA. y(x):=log(abs(1/(1+exp(%i*x))))$ plot2d( y(x),[x,0.1,1])$ MAXIMA complains with "sign: argument cannot be imaginary; found %i" but works with MAXIMA 5.20.1  Comment By: Aleksas (aleksasd) Date: 20110608 00:18 Message: abs change to cabs: y(x):=log(cabs(1/(1+exp(%i*x))))$ plot2d( y(x),[x,0.1,1])$ work with maxima 5.24.0  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311100&group_id=4933 
From: SourceForge.net <noreply@so...>  20110603 21:20:06

Bugs item #2995089, was opened at 20100501 07:37 Message generated for change (Settings changed) made by sfrobot You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2995089&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: Works For Me Priority: 5 Private: No Submitted By: Sam Hagen (neanderslob) Assigned to: Nobody/Anonymous (nobody) Summary: arbitrary constant exponent seems to confound integration Initial Comment: It can best be explained by a look at the HTML file attached, I have comments in there as well to point out what to look at. It appears that the power of an arbitrary constant will affect the outcome of an integration.  >Comment By: SourceForge Robot (sfrobot) Date: 20110603 21:20 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: Dan Gildea (dgildea) Date: 20110520 21:06 Message: Seems OK in current git: (%i2) integrate(cos(b*x)*exp(x^2/a^2),x,0,inf); Is a positive or negative? p; Is b positive or negative? p; (%o2) sqrt(%pi)*a*%e^(a^2*b^2/4)/2  Comment By: Dieter Kaiser (crategus) Date: 20100821 12:14 Message: We had a bug fix for the bug ID: 3034140 "incorrect integration of %e^((x^2*a^2))*cos(b*x)". We get the example of this bug report when we set b=1. At first the correct results. We start with the assumption a>0: (%i1) assume(a>0)$ (%i2) integrate(cos(b*x)*exp(x^2/a^2),x,minf,inf); (%o2) sqrt(%pi)*a*%e^(a^2*b^2/4) (%i3) integrate(cos(b*x)*exp(x^2/a^2),x,0,inf); (%o3) sqrt(%pi)*a*%e^(a^2*b^2/4)/2 Both integrals are correct. There is no problem. Now again with no assumption. The first integral again is correct: (%i4) forget(a>0)$ (%i5) integrate(cos(b*x)*exp(x^2/a^2),x,minf,inf); Is a positive or negative? p; (%o5) sqrt(%pi)*a*%e^(a^2*b^2/4) But the following integral gives an extra factor erf(%i*a*b/2). This is wrong: (%i6) integrate(cos(b*x)*exp(x^2/a^2),x,0,inf); Is a positive or negative? p; Is b positive or negative? p; (%o6) sqrt(%pi)*a*%e^(a^2*b^2/4)*erf(%i*a*b/2)/2 By the way: The behavior of Maxima for this integral differs for Maxima 5.21, 5.22 and current CVS. In all versions of Maxima the indefinite integral is the same: (%i7) integrate(cos(b*x)*exp(x^2/a^2),x); (%o7) sqrt(%pi)*%e^(a^2*b^2/4) *(a*erf((2*x+%i*a^2*b)/(2*a))+a*erf((2*x%i*a^2*b)/(2*a))) /4 Dieter Kaiser  Comment By: Dieter Kaiser (crategus) Date: 20100709 21:32 Message: The problem of this bug report is caused by the behavior of Maxima to return INFINITY for the following limit: limit(r/a, r, inf) > infinity If the sign of the parameter a is known to be positive Maxima gives limit(r/a, r, inf) > inf This is related to the problem of this bug report the following way. The indefinite integral is (%i1) integrate(cos(r)*exp(r^2/a^2),r),factor; (%o1) sqrt(%pi)*a*%e^(a^2/4) *(erf((2*r+%i*a^2)/(2*a))+erf((2*r%i*a^2)/(2*a))) /4 This answer is correct. It contains two erf terms. The problem is the limit of the erf function for r > inf. We take one of the terms: (%i2) limit(erf((2*r+%i*a^2)/(2*a)), r, inf); (%o2) und The realpart of the argument is r/a. Maxima returns INFINITY for the limit of the argument because the sign of r/a is not known. This gives UND as the result for the erf function and as a consequence UND as the result for the definite integral. So the problem of this bug report is, that Maxima returns immediately INFINITY for the limit of r/a and does not ask for the sign of the parameter a. Of course, Maxima gets the correct answer, if we assume the parameter a to be positive, but the user might not recognize that this information is necessary, because a limit has to be evaluated for an expression r/a. (%i6) assume(a>0)$ (%i7) integrate(cos(r)*exp(r^2/a^2),r,0,inf),factor; (%o7) sqrt(%pi)*a*%e^(a^2/4)/2 Dieter Kaiser  Comment By: Dieter Kaiser (crategus) Date: 20100501 12:33 Message: Thank you very much for the report. The underlying problem of this bug report is the following definite integral. We have a constant a in the exponent of the exp function: (%i1) integrate(cos(r)*exp(r^2/a),r,0,inf); Is a positive or negative? p; (%o1) sqrt(%pi)*sqrt(a)*%e^(a/4)/2 When we take the square of the constant, Maxima no longer gets a result: (%i2) integrate(cos(r)*exp(r^2/a^2),r,0,inf); (%o2) und It works again if we assume a to be positive. This is a bit strange, because a^2 is known to be positive too: (%i3) assume(a>0)$ (%i4) integrate(cos(r)*exp(r^2/a^2),r,0,inf); (%o4) sqrt(%pi)*a*%e^(a^2/4)/2 There is a second problem. The derivative of 'und gives 0. 'und is the intermediate result of the integration of the example of this bug report: (%i2) diff(und,q); (%o2) 0 Dieter Kaiser  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2995089&group_id=4933 
From: SourceForge.net <noreply@so...>  20110603 15:58:38

Bugs item #3311145, was opened at 20110603 10:58 Message generated for change (Tracker Item Submitted) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311145&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 Private: No Submitted By: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: integrate(x^m * exp(x^2),x,minf,inf) > 0 Initial Comment: Bogus: (%i1) integrate(x^m * exp(x^2),x,minf,inf); "Is "m+1" positive, negative, or zero?"pos; "Is "m" an "integer"?"yes; (%o1) 0  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311145&group_id=4933 
From: SourceForge.net <noreply@so...>  20110603 14:05:59

Bugs item #3311100, was opened at 20110603 16:05 Message generated for change (Tracker Item Submitted) made by sergiopesenti You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311100&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  Plotting Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: sergio pesenti (sergiopesenti) Assigned to: Nobody/Anonymous (nobody) Summary: plot2d problem from 5.24.0 Initial Comment: The following plot does not execute in recent releases of MAXIMA. y(x):=log(abs(1/(1+exp(%i*x))))$ plot2d( y(x),[x,0.1,1])$ MAXIMA complains with "sign: argument cannot be imaginary; found %i" but works with MAXIMA 5.20.1  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311100&group_id=4933 
From: SourceForge.net <noreply@so...>  20110603 10:57:02

Bugs item #3311031, was opened at 20110603 05:57 Message generated for change (Tracker Item Submitted) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311031&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 Private: No Submitted By: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: too complicated result with gcd : 'spmod Initial Comment: OK: (%i5) radcan(exp(((t2*%i)*x^2)/(4*t2*%i))), gcd : 'red; (%o5) %e^(((t2*%i)*x^2)/(4*t2*%i)) Too messy: (%i6) radcan(exp(((t2*%i)*x^2)/(4*t2*%i))), gcd : 'spmod; (%o6) %e^(((32*t^6144*%i*t^5240*t^4+200*%i*t^3+90*t^221*%i*t2)*x^2)/(128*t^6384*%i*t^5480*t^4+320*%i*t^3+120*t^224*%i*t2)) See also http://www.math.utexas.edu/pipermail/maxima/2011/025233.html  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311031&group_id=4933 
From: SourceForge.net <noreply@so...>  20110603 10:51:02

Bugs item #3311028, was opened at 20110603 05:51 Message generated for change (Tracker Item Submitted) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311028&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 Private: No Submitted By: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: gcd : red bug Initial Comment: (%i1) integrate((sqrt(22*x^2) * (sqrt(2) + sqrt(2) * x^2))/(44*x^2),x,0,1), gcd : red; `quotient' by `zero'  an error. To debug this try: debugmode(true);  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3311028&group_id=4933 