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From: SourceForge.net <noreply@so...>  20061021 18:18:36

Bugs item #1572963, was opened at 20061007 18:06 Message generated for change (Comment added) made by robert_dodier You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1572963&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: Pending >Resolution: Wont Fix Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Inequalities bug Initial Comment: hi there is list bugs for maxima at: http://www.texsales.se/Artiklar/MaximaMuPAD.pdf#search=%22mupad%20vs%20maxima%22 I've personally checked this inequality: assume(x >= y, y >= z, z >= x)$ is( x = z ); I'm using maxima5.10.0.  >Comment By: Robert Dodier (robert_dodier) Date: 20061021 12:18 Message: Logged In: YES user_id=501686 x = z means x has the same structure as z. equal(x, z) means x is equivalent to z. assume(x >= y, y >= z, z >= x)$ is(equal(x, z)) yields true as one would hope. Marking this report "won't fix" and "pending" (so that it will be automatically closed in 2 weeks in case original poster comes back).  Comment By: Nobody/Anonymous (nobody) Date: 20061016 12:19 Message: Logged In: NO is(equal(a,b)); works. The distinction of "=" vs. "equal" is confusing  perhaps it should be revised for Maxima 6.0.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1572963&group_id=4933 
From: SourceForge.net <noreply@so...>  20061021 18:09:24

Bugs item #1567209, was opened at 20060928 12:06 Message generated for change (Comment added) made by robert_dodier You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1567209&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: None >Status: Closed >Resolution: Wont Fix Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Gentoo missing from a list of distributions with Maxima Initial Comment: FAQ 3.3., "What Linux Distributions come with Maxima?", doesn't list Gentoo Linux, but Maxima is available in Portage (as scimathematics/maxima, current version 5.9.1) and installs normally.  >Comment By: Robert Dodier (robert_dodier) Date: 20061021 12:09 Message: Logged In: YES user_id=501686 The FAQ is out of date. The Maxima ports page has more up to date information. I've submitted an enhancement request to Gentoo (http://bugs.gentoo.org/show_bug.cgi?id=152276) for someone to put more info about Gentoo on the ports page. Closing this report as "won't fix" since maintaining info about Gentoo is not a responsibility for the Maxima project.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1567209&group_id=4933 
From: SourceForge.net <noreply@so...>  20061021 07:53:39

Bugs item #1581303, was opened at 20061020 06:53 Message generated for change (Comment added) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1581303&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: Xmaxima or other UI Group: None Status: Open Resolution: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Error in startup script: can't read "prefix": no such variab Initial Comment: I'm on Linux (Slackware 11.0) and trying to run the cvs version of maxima. Console maxima works fine, but xmaxima seems to be confused. Here is the full error I currently get. begin Error Information: An exit code of 1 was returned from xmaxima Output Data: There was no output Error Logs: Error in startup script: can't read "prefix": no such variable while executing "set autoconf(datadir) "${prefix}/share"" (file "/usr/local/bin/xmaxima" line 15028) end I tried to install from cvs (for some reason, there is no source available for the current release version, only a bunch of rpms)  Comment By: Nobody/Anonymous (nobody) Date: 20061021 00:53 Message: Logged In: NO I encountered a similar error with Maxima 5.10.0cvs compiled on Mac OSX Tiger (+Fink). The binary files were OK, but info files were not installed properly. Fore this reason, when I typed describe and demonstrate commands, maxima gave me a reply like this: " ... was not found at /$prefix/share/info." I explicitely set the following options besides prefix for the configure script, reinstalled maxima, and now the above mentioned commands work perfectly. datarootdir=/sw/share infodir=/sw/share/info Hope this helps.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1581303&group_id=4933 
From: SourceForge.net <noreply@so...>  20061020 13:54:00

Bugs item #1581303, was opened at 20061020 06:53 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=1581303&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: Xmaxima or other UI Group: None Status: Open Resolution: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Error in startup script: can't read "prefix": no such variab Initial Comment: I'm on Linux (Slackware 11.0) and trying to run the cvs version of maxima. Console maxima works fine, but xmaxima seems to be confused. Here is the full error I currently get. begin Error Information: An exit code of 1 was returned from xmaxima Output Data: There was no output Error Logs: Error in startup script: can't read "prefix": no such variable while executing "set autoconf(datadir) "${prefix}/share"" (file "/usr/local/bin/xmaxima" line 15028) end I tried to install from cvs (for some reason, there is no source available for the current release version, only a bunch of rpms)  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1581303&group_id=4933 
From: SourceForge.net <noreply@so...>  20061018 17:15:55

Bugs item #1579852, was opened at 20061018 19:15 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=1579852&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 Submitted By: Mark Peloquin (incripshin) Assigned to: Nobody/Anonymous (nobody) Summary: bad integral evaluation Initial Comment: The following integral should evaluate to infinity: integrate(x/sqrt(1+x^4), x, 1, inf); This should be obvious since it's essentially integrating 1/x up to infinity, which diverges. Do the work if you like ... it diverges. Maxima evaluates this to: log((2*sqrt(2)+3)/(24*sqrt(2)+34))/4 However, maxima can tell that this diverges: limit(integrate(x/sqrt(1+x^4), x), x, inf)  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1579852&group_id=4933 
From: SourceForge.net <noreply@so...>  20061016 18:19:39

Bugs item #1572963, was opened at 20061007 17:06 Message generated for change (Comment added) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1572963&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: Inequalities bug Initial Comment: hi there is list bugs for maxima at: http://www.texsales.se/Artiklar/MaximaMuPAD.pdf#search=%22mupad%20vs%20maxima%22 I've personally checked this inequality: assume(x >= y, y >= z, z >= x)$ is( x = z ); I'm using maxima5.10.0.  Comment By: Nobody/Anonymous (nobody) Date: 20061016 11:19 Message: Logged In: NO is(equal(a,b)); works. The distinction of "=" vs. "equal" is confusing  perhaps it should be revised for Maxima 6.0.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1572963&group_id=4933 
From: SourceForge.net <noreply@so...>  20061016 13:23:37

Bugs item #1577267, was opened at 20061014 12:59 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1577267&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: Windows DEP Execution Problem Initial Comment: CPU: AMD64 dualcore OS: Windows XP Maxima: 5.10.0 DEP (Data Execution Prevention) is turned on. maxima.bat fails to execute maxima.exe. XMaxima and wxMaxima report a missing connection to Maxima. There is no warning, no hint to the real problem. I was confused, Filemon/Regmon did not help. In the wxMaxima discussion forum I found the solution. Workaround: include the full program path of maxima.exe C:\Program Files\Maxima5.10.0\lib\maxima\5.10.0\binarygcl\maxima.exe in the list of DEP exceptions (Control Panel>System>Advanced>Performance>DEP) Problem: It seems that the LISP interpreter in maxima.exe is executing binary code in data sections. This should be fixed.  >Comment By: Raymond Toy (rtoy) Date: 20061016 09:23 Message: Logged In: YES user_id=28849 I don't know about GCL in particular, but I believe this is how most Lisp implementations work.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1577267&group_id=4933 
From: SourceForge.net <noreply@so...>  20061016 13:21:08

Bugs item #1571454, was opened at 20061005 10:50 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1571454&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: Closed >Resolution: Fixed Priority: 5 Submitted By: Raymond Toy (rtoy) Assigned to: Nobody/Anonymous (nobody) Summary: plot2d(0.99,[x,0,5]) is very slow Initial Comment: As the summary says, it is very slow. I think it's caused by roundoff error in the adaptive plotter and this causes the adaptive plotter to generate a huge number of points. One one machine, it takes 31 sec to plot. I think the issue is in smoothenoughp. It checks if abs(quad)  other stuff is <= 0. However, roundoff prevents this from happening. One simple solution is to change it from comparing with 0 to something larger. By doing so, the plot now takes 0.06 sec.  >Comment By: Raymond Toy (rtoy) Date: 20061016 09:21 Message: Logged In: YES user_id=28849 Fixed as suggested in plot.lisp, rev 1.73.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1571454&group_id=4933 
From: SourceForge.net <noreply@so...>  20061014 16:59:48

Bugs item #1577267, was opened at 20061014 09:59 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=1577267&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: Windows DEP Execution Problem Initial Comment: CPU: AMD64 dualcore OS: Windows XP Maxima: 5.10.0 DEP (Data Execution Prevention) is turned on. maxima.bat fails to execute maxima.exe. XMaxima and wxMaxima report a missing connection to Maxima. There is no warning, no hint to the real problem. I was confused, Filemon/Regmon did not help. In the wxMaxima discussion forum I found the solution. Workaround: include the full program path of maxima.exe C:\Program Files\Maxima5.10.0\lib\maxima\5.10.0\binarygcl\maxima.exe in the list of DEP exceptions (Control Panel>System>Advanced>Performance>DEP) Problem: It seems that the LISP interpreter in maxima.exe is executing binary code in data sections. This should be fixed.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1577267&group_id=4933 
From: SourceForge.net <noreply@so...>  20061014 11:03:46

Bugs item #1575107, was opened at 20061011 03:23 Message generated for change (Settings changed) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1575107&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  Simplification Group: None >Status: Closed Resolution: Invalid Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: We can simplify even more Initial Comment: Since z/sqrt(z) = sqrt(z), fullratsimp((3*x^2)/(4*sqrt(3))); should return (sqrt(3)*x^2)/4. I'm starting to think that there are many problems that would be fixed by treating the sqrt(x) function as x^(1/2) and then return to sqrt(x) form when all calculations are done. Mario/Mexico  Comment By: Barton Willis (willisbl) Date: 20061011 04:57 Message: Logged In: YES user_id=895922 To do the simplification that you wanted, set the option variable 'algebraic' to true: (%i1) ratsimp((3*x^2)/(4*sqrt(3))), algebraic : true; (%o1) (sqrt(3)*x^2)/4 And by the way, internally, sqrt(x) is x^(1/2). To see this, do this: (%i2) ?print(sqrt(x)); ((MEXPT SIMP) $X ((RAT SIMP) 1 2))  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1575107&group_id=4933 
From: SourceForge.net <noreply@so...>  20061011 10:09:28

Bugs item #1575120, was opened at 20061011 03:54 Message generated for change (Comment added) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1575120&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  Simplification Group: None Status: Open Resolution: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Some laws are still missing Initial Comment: is(equal((x/y)^z,(x^z/y^z))); is(equal((x*y)^z,(x^z*y^z))); is(equal((x^y)^z,(x^(y*z)))); of course they are equal! Those are laws! Mario/Mexico  >Comment By: Barton Willis (willisbl) Date: 20061011 05:09 Message: Logged In: YES user_id=895922 For real x,y,z, the equation (x*y)^z = x^z*y^z isn't an identity. To see this, let x > 1, y > 1, and z > 1/2. If Maxima did is(equal((x*y)^z,(x^z*y^z))) > true that would be a bug. Similarly, all your other laws are not valid for all real numbers. (1) We're working on improving the function equal; it has many known problems. (2) The function 'radcan' does (%i16) radcan((x*y)^z); (%o16) x^z*y^z Maybe you would like to use it.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1575120&group_id=4933 
From: SourceForge.net <noreply@so...>  20061011 09:57:16

Bugs item #1575107, was opened at 20061011 03:23 Message generated for change (Comment added) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1575107&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  Simplification Group: None Status: Open >Resolution: Invalid Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: We can simplify even more Initial Comment: Since z/sqrt(z) = sqrt(z), fullratsimp((3*x^2)/(4*sqrt(3))); should return (sqrt(3)*x^2)/4. I'm starting to think that there are many problems that would be fixed by treating the sqrt(x) function as x^(1/2) and then return to sqrt(x) form when all calculations are done. Mario/Mexico  >Comment By: Barton Willis (willisbl) Date: 20061011 04:57 Message: Logged In: YES user_id=895922 To do the simplification that you wanted, set the option variable 'algebraic' to true: (%i1) ratsimp((3*x^2)/(4*sqrt(3))), algebraic : true; (%o1) (sqrt(3)*x^2)/4 And by the way, internally, sqrt(x) is x^(1/2). To see this, do this: (%i2) ?print(sqrt(x)); ((MEXPT SIMP) $X ((RAT SIMP) 1 2))  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1575107&group_id=4933 
From: SourceForge.net <noreply@so...>  20061011 08:54:59

Bugs item #1575120, was opened at 20061011 01:54 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=1575120&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  Simplification Group: None Status: Open Resolution: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Some laws are still missing Initial Comment: is(equal((x/y)^z,(x^z/y^z))); is(equal((x*y)^z,(x^z*y^z))); is(equal((x^y)^z,(x^(y*z)))); of course they are equal! Those are laws! Mario/Mexico  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1575120&group_id=4933 
From: SourceForge.net <noreply@so...>  20061011 08:23:12

Bugs item #1575107, was opened at 20061011 01:23 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=1575107&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  Simplification Group: None Status: Open Resolution: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: We can simplify even more Initial Comment: Since z/sqrt(z) = sqrt(z), fullratsimp((3*x^2)/(4*sqrt(3))); should return (sqrt(3)*x^2)/4. I'm starting to think that there are many problems that would be fixed by treating the sqrt(x) function as x^(1/2) and then return to sqrt(x) form when all calculations are done. Mario/Mexico  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1575107&group_id=4933 
From: SourceForge.net <noreply@so...>  20061010 17:26:04

Bugs item #1574680, was opened at 20061010 10:25 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=1574680&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: Open Resolution: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: power_mod in manual Initial Comment: In the manual, the item for the "power_mod" function doesn't seem to appear at its correct alphabetical place : in the file share/maxima/510~1.0/doc/html/maxima_32.html describing number theory functions, I see in this order : ... minfactorial power_mod next_prime partfrac primep ... I suggest to use the following order ... minfactorial next_prime partfrac power_mod primep ... This concerns the following version : Maxima version: 5.10.0 Maxima build date: 19:9 9/21/2006 host type: i686pcmingw32 lispimplementationtype: GNU Common Lisp (GCL) lispimplementationversion: GCL 2.6.7 Eric Reyssat email : reyssat@...  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1574680&group_id=4933 
From: SourceForge.net <noreply@so...>  20061010 11:15:16

Bugs item #1573247, was opened at 20061008 12:06 Message generated for change (Comment added) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1573247&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: 4 Submitted By: Barton Willis (willisbl) Assigned to: Barton Willis (willisbl) Summary: cholesky factor of double blocked matrix Initial Comment: (%o90) matrix([matrix([matrix([8,4],[4,13]), matrix([2,4],[7,9])],[matrix([2,7],[4,9]), matrix([10,6],[6,15])]), matrix([matrix([4,4],[12,5]), matrix([0,6],[6,8])],[matrix([8,3],[13,3]), matrix([6,5],[5,6])])],[matrix([matrix([4,12],[4,5]), matrix([8,13],[3,3])],[matrix([0,6],[6,8]), matrix([6,5],[5,6])]),matrix([matrix([18,5],[5,4]), matrix([5,9],[2,6])],[matrix([5,2],[9,6]), matrix([6,3],[3,11])])]) (%i91) cholesky(%,'noncommutingring); Division by 0 This shouldn't give a divide by zero error. I think the bug doesn't happen for single blocked matrices. The problem is that cholesky tries to invert a blocked matrix with "^^". That doesn't work for block matrices.  >Comment By: Barton Willis (willisbl) Date: 20061010 06:15 Message: Logged In: YES user_id=895922 Fixed by mring.lisp reversion 1.13.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1573247&group_id=4933 
From: SourceForge.net <noreply@so...>  20061010 10:37:01

Bugs item #1573408, was opened at 20061008 19:57 Message generated for change (Comment added) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1573408&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 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Cannot solve some solveable expressions Initial Comment: Cannot solve some expressions in the form "x = f(x)" Example: x = sqrt(x) + a; solve(%,x); Still, we can find the answer: x = sqrt(x) + a; %a; %^2; solve(%,x); Mario/Mexico  >Comment By: Barton Willis (willisbl) Date: 20061010 05:37 Message: Logged In: YES user_id=895922 This isn't a bug, it's a deficiency. I suggest that you submit this as a feature request. There was a discussion about such equations on the mailing list not long ago. If you have not subscribed to the list, I suggest that you do so. And of course, we are always looking for new volunteers to help improve Maxima.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1573408&group_id=4933 
From: SourceForge.net <noreply@so...>  20061010 10:26:40

Bugs item #1573476, was opened at 20061008 21:31 Message generated for change (Comment added) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1573476&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: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: abs(x) does not work in vectors Initial Comment: As the summary says, the abs function is not working in vectors. We all know that abs(x)=sqrt(x^2) But if x = [x[1],x[2],x[3],...,x[n]] then the abs function should be abs(x):= sqrt(x[1]^2 + x[2]^2 + x[3]^2 + ... + x[n]^2) That's why abs(x + %i*y) returns sqrt(x^2 + y^2), because x + iy = [x,y] Mario/Mexico  >Comment By: Barton Willis (willisbl) Date: 20061010 05:26 Message: Logged In: YES user_id=895922 In Maxima, [e1, e2, ... ,en] is a list. A list can be used to represent a vector, but a list doesn't have to represent a vector. Although undocumented, the function abs maps over list members. If you want a vector 2norm, you'll need to define it yourself: something like vector_norm(x) := sqrt(x . conjugate(x)); Maybe Maxima should have a vector object. But it doesn't.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1573476&group_id=4933 
From: SourceForge.net <noreply@so...>  20061010 10:11:16

Bugs item #1573422, was opened at 20061008 20:25 Message generated for change (Comment added) made by willisbl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1573422&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  Simplification Group: None >Status: Closed >Resolution: Invalid Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Exponentiation laws are missing Initial Comment: Take a look at http://en.wikipedia.org/wiki/Exponentiation#Identities_and_properties We KNOW that aⁿ × bⁿ = (a × b)ⁿ, because that is a LAW. (That is "a^n * b^n = (a * b)^n") This is ignored by Maxima, for instance, (%i1) fullratsimp(7*sqrt(3)*sqrt(78)); (%o1) 7*sqrt(3)*sqrt(78) still, 7*sqrt(3)*sqrt(78) = 7*sqrt(3*78) so the correct answer is (%o1) 21*sqrt(26) Mario/Mexico  >Comment By: Barton Willis (willisbl) Date: 20061010 05:11 Message: Logged In: YES user_id=895922 The function radcan does what you want: (%i6) radcan(7*sqrt(3)*sqrt(78)); (%o6) 21*sqrt(2)*sqrt(13) Also, a^n * b^n = (a * b)^n isn't an identity. Try a > 1, b > 1, and n > 1/2. If Maxima automatically did a^n * b^n ==> (a * b)^n, that would be a bug. The wikipedia article you reference *does* say that n is an integer; in your example, the exponent isn't an integer.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1573422&group_id=4933 
From: SourceForge.net <noreply@so...>  20061009 03:16:16

Bugs item #1489164, was opened at 20060515 15:25 Message generated for change (Comment added) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1489164&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: 8 Submitted By: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: is(equal(%i,0)) Initial Comment: (%i9) is(equal(%i,0)); `sign' called on an imaginary argument: (%i10) is(equal(und,0)); `sign' called on `und'. I claim that both of these should evaluate to false. It seems that equal should call csign, not $sign. Barton  Comment By: Nobody/Anonymous (nobody) Date: 20061008 20:16 Message: Logged In: NO Well, two complex numbers are equal if and only if their real and imaginary parts are equal. That is "a + ib = c + id" if and only if "a = c" and "b = d" If the complex number is in the polar form, they are equal if and only if they have the same magnitude and direction, that is "a*%e^(%i*b) = c*%e^(%i*d)" if and only if "a = c" and "b = d" Generally speaking, any two vectors are equal if and only if they are equal in its components. That is [x[1],x[2],x[3],...,x[n]] = [y[1],y[2],y[3],...y[m]] only when "n = m" and "x[i]=y[i]" for all 'i' between 1 and n Otherwise, they are not equal I hope this can help to improve Maxima Mario/Mexico  Comment By: Robert Dodier (robert_dodier) Date: 20060826 12:31 Message: Logged In: YES user_id=501686 Increase priority. This is a serious hindrance.  Comment By: Robert Dodier (robert_dodier) Date: 20060604 22:05 Message: Logged In: YES user_id=501686 Fix title of this item (equla > equal).  Comment By: Robert Dodier (robert_dodier) Date: 20060515 17:09 Message: Logged In: YES user_id=501686 Agreed, these are bugs, and these should both yield false.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1489164&group_id=4933 
From: SourceForge.net <noreply@so...>  20061009 02:31:19

Bugs item #1573476, was opened at 20061008 19:31 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=1573476&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: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: abs(x) does not work in vectors Initial Comment: As the summary says, the abs function is not working in vectors. We all know that abs(x)=sqrt(x^2) But if x = [x[1],x[2],x[3],...,x[n]] then the abs function should be abs(x):= sqrt(x[1]^2 + x[2]^2 + x[3]^2 + ... + x[n]^2) That's why abs(x + %i*y) returns sqrt(x^2 + y^2), because x + iy = [x,y] Mario/Mexico  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1573476&group_id=4933 
From: SourceForge.net <noreply@so...>  20061009 01:25:43

Bugs item #1573422, was opened at 20061008 18:25 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=1573422&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  Simplification Group: None Status: Open Resolution: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Exponentiation laws are missing Initial Comment: Take a look at http://en.wikipedia.org/wiki/Exponentiation#Identities_and_properties We KNOW that aⁿ × bⁿ = (a × b)ⁿ, because that is a LAW. (That is "a^n * b^n = (a * b)^n") This is ignored by Maxima, for instance, (%i1) fullratsimp(7*sqrt(3)*sqrt(78)); (%o1) 7*sqrt(3)*sqrt(78) still, 7*sqrt(3)*sqrt(78) = 7*sqrt(3*78) so the correct answer is (%o1) 21*sqrt(26) Mario/Mexico  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1573422&group_id=4933 
From: SourceForge.net <noreply@so...>  20061009 00:57:11

Bugs item #1573408, was opened at 20061008 17:57 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=1573408&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 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Cannot solve some solveable expressions Initial Comment: Cannot solve some expressions in the form "x = f(x)" Example: x = sqrt(x) + a; solve(%,x); Still, we can find the answer: x = sqrt(x) + a; %a; %^2; solve(%,x); Mario/Mexico  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1573408&group_id=4933 
From: SourceForge.net <noreply@so...>  20061008 17:06:45

Bugs item #1573247, was opened at 20061008 12:06 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=1573247&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: Open Resolution: None Priority: 4 Submitted By: Barton Willis (willisbl) Assigned to: Barton Willis (willisbl) Summary: cholesky factor of double blocked matrix Initial Comment: (%o90) matrix([matrix([matrix([8,4],[4,13]), matrix([2,4],[7,9])],[matrix([2,7],[4,9]), matrix([10,6],[6,15])]), matrix([matrix([4,4],[12,5]), matrix([0,6],[6,8])],[matrix([8,3],[13,3]), matrix([6,5],[5,6])])],[matrix([matrix([4,12],[4,5]), matrix([8,13],[3,3])],[matrix([0,6],[6,8]), matrix([6,5],[5,6])]),matrix([matrix([18,5],[5,4]), matrix([5,9],[2,6])],[matrix([5,2],[9,6]), matrix([6,3],[3,11])])]) (%i91) cholesky(%,'noncommutingring); Division by 0 This shouldn't give a divide by zero error. I think the bug doesn't happen for single blocked matrices. The problem is that cholesky tries to invert a blocked matrix with "^^". That doesn't work for block matrices.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1573247&group_id=4933 
From: SourceForge.net <noreply@so...>  20061008 00:06:42

Bugs item #1572963, was opened at 20061007 17:06 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=1572963&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: Inequalities bug Initial Comment: hi there is list bugs for maxima at: http://www.texsales.se/Artiklar/MaximaMuPAD.pdf#search=%22mupad%20vs%20maxima%22 I've personally checked this inequality: assume(x >= y, y >= z, z >= x)$ is( x = z ); I'm using maxima5.10.0.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1572963&group_id=4933 