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From: SourceForge.net <noreply@so...>  20060905 15:41:22

Bugs item #1044318, was opened at 20041010 23:40 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1044318&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 Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: defint(1/(sin(x)^2+1),x,0,3*%pi) wrong Initial Comment: INTEGRATE(1/(SIN(x)^2+1),x,0,3*%PI) => 0 Since the integrand is everywhere >= 1/2, the integral cannot be zero  in fact integrate(1/(sin(x)^2+1),x,q,q+k*%pi) = k*pi/sqrt(2) (real q, integral k) Presumably defint is using the indefinite integral atan(2*tan(x)/sqrt(2))/sqrt(2) inappropriately.  >Comment By: Raymond Toy (rtoy) Date: 20060905 11:40 Message: Logged In: YES user_id=28849 Closing this report. The function INFR has been replaced with a new version that works for this case. I've also updated INTSC1 so that it can handle the case where the limits are q and q + k * 2 * %pi, for k a numerical integer. There are still other issues, which we be in a new bug report.  Comment By: Raymond Toy (rtoy) Date: 20060901 17:12 Message: Logged In: YES user_id=28849 I think the problem is caused by INFR. I think it's supposed to compute how many full periods and fractional periods are in the integral, but it does it incorrectly. The following replacement: (defun infr (a) (let* ((q (igprt (div a (mul 2 '$%pi)))) (r (add a (mul 1 (mul q 2 '$%pi))))) (cons q r))) works much better for this example, and we get 3*pi/sqrt(2), as expected. In the results shown by Robert, ratsimp produces zero because atan is using the principal result, but defint is trying to tell you to be careful by returning atan(sqrt(2)*tan(3*%pi))...  Comment By: Robert Dodier (robert_dodier) Date: 20060730 23:46 Message: Logged In: YES user_id=501686 Observed in 5.9.3cvs. I find defint(1/(sin(x)^2+1),x,0,3*%pi); => sqrt(2)*atan(sqrt(2)*tan(3*%pi))/2 sqrt(2)*atan(sqrt(2)*tan(0))/2 but then ratsimp(%) => 0 .  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1044318&group_id=4933 
From: SourceForge.net <noreply@so...>  20060905 14:27:53

Bugs item #1552710, was opened at 20060905 10:27 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=1552710&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: product(sum(f(i),i,1,inf),j,1,inf) => inf (wrong) Initial Comment: product(sum(f(i),i,1,inf),j,1,inf) simplifies to inf This is wrong. The simplest counterexample is f(i):=0, where the product = 0. If you want to get fancier, consider f(i):=2^i; product = 1. 5.9.3 Windows GCL  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1552710&group_id=4933 
From: SourceForge.net <noreply@so...>  20060904 22:57:43

Bugs item #1552253, was opened at 20060904 15:57 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=1552253&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: Maxima encountered a Lisp error on start Initial Comment: I couldn't run maxima on amd64 gentoo linux system, error is below. I'm ready to provide as much info as you need to fix this problem. Error: >$ maxima Maxima encountered a Lisp error: Error in SETQ [or a callee]: 0 and 2 are illegal as :START and :END for the sequence "". Automatically continuing. To reenable the Lisp debugger set *debuggerhook* to nil. Error in SUBSEQ [or a callee]: The tag RETURNFROMDEBUGGER is undefined. Fast links are on: do (usefastlinks nil) for debugging Broken at CONDITIONS::CLCSUNIVERSALERRORHANDLER. 1 (Abort) Return to debug level 1. 2 Return to top level. dbl:MAXIMA>>>:bt #0 CLCSUNIVERSALERRORHANDLER {errorname=:error,correctable=nil,functionname=setq,continueformatstring=(""...} [ihs=14] #1 SUBSEQ {loc0="",loc1=0,loc2=2,loc3=nil} [ihs=13] #2 Computing args for STRINGDOWNCASE {} [ihs=12] #3 SETLOCALE {} [ihs=7] #4 RUN {} [ihs=4] NIL dbl:MAXIMA>>>  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1552253&group_id=4933 
From: SourceForge.net <noreply@so...>  20060904 10:04:25

Bugs item #1550985, was opened at 20060902 13:59 Message generated for change (Comment added) made by andrejv You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1550985&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: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: niceindices Initial Comment: Error: (%i1) sum(1/kk,kk,1,n)  sum(1/ii,ii,1,n)$ (%i2) niceindices(%); Maxima encountered a Lisp error: No error: (%i3) sum(1/k,k,1,n)  sum(1/i,i,1,n)$ (%i4) niceindices(%); (%o4) (sum(1/i,i,1,n))sum(1/j,j,1,n) Barton  >Comment By: Andrej Vodopivec (andrejv) Date: 20060904 12:04 Message: Logged In: YES user_id=1179910 I attached a patch for sumcon.lisp which fixes this bug. With this patch (%i2) sum(1/kk,kk,1,n)  sum(1/ii,ii,1,n)$ (%i3) niceindices(%); (%o3) 0 Andrej  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1550985&group_id=4933 
From: SourceForge.net <noreply@so...>  20060903 03:33:43

Bugs item #1551310, was opened at 20060902 21:33 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=1551310&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: Robert Dodier (robert_dodier) Assigned to: Nobody/Anonymous (nobody) Summary: mod and floor should distribute over matrix and list Initial Comment: >From the mailing list: On 9/2/06, Stavros Macrakis <macrakis@...> wrote: > On 9/1/06, Barton Willis <willisb@...> wrote: > > To apply mod to each element of a matrix, you'll still need to use > > matrixmap and a lambda form. Doing mod(matrix([...]),10) makes a mess... > > Well, that's a bug we should fix... both mod and floor should > distribute over matrix and list. The current result is silly. Couple of random addenda: (1) Are there other functions to consider here? e.g. ceiling  maybe others? (2) Should mod, floor, ceiling, etc also distribute over sets?  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1551310&group_id=4933 
From: SourceForge.net <noreply@so...>  20060902 13:17:12

Bugs item #929704, was opened at 20040405 08:10 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=929704&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: Fix for 5.9.0 Status: Open Resolution: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: defint log(abs(...))/sqrt(...) gives wrong result Initial Comment: integrate((log(abs(diff(4*x*(1x),x))))/(%pi*sqrt(x*(1 x))),x,0,1); The resoult of computation is log(4); ,but it is not corect,the right resoult is log(2);  >Comment By: Raymond Toy (rtoy) Date: 20060902 09:17 Message: Logged In: YES user_id=28849 If you trace antideriv, you can see that it is computing the indefinite integral and returns the result: 2*atan(sqrt(1x)/sqrt(x))*log(abs(8*x4)) The derivative doesn't look anything like the integrand. But maxima thinks the indefinite integral doesn't exist. The function antideriv is doing something but I don't know what.  Comment By: Robert Dodier (robert_dodier) Date: 20060729 02:06 Message: Logged In: YES user_id=501686 Observed in 5.9.3cvs.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=929704&group_id=4933 
From: SourceForge.net <noreply@so...>  20060902 11:59:38

Bugs item #1550985, was opened at 20060902 06:59 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=1550985&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: Barton Willis (willisbl) Assigned to: Nobody/Anonymous (nobody) Summary: niceindices Initial Comment: Error: (%i1) sum(1/kk,kk,1,n)  sum(1/ii,ii,1,n)$ (%i2) niceindices(%); Maxima encountered a Lisp error: No error: (%i3) sum(1/k,k,1,n)  sum(1/i,i,1,n)$ (%i4) niceindices(%); (%o4) (sum(1/i,i,1,n))sum(1/j,j,1,n) Barton  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1550985&group_id=4933 
From: SourceForge.net <noreply@so...>  20060901 21:12:36

Bugs item #1044318, was opened at 20041010 23:40 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1044318&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: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: defint(1/(sin(x)^2+1),x,0,3*%pi) wrong Initial Comment: INTEGRATE(1/(SIN(x)^2+1),x,0,3*%PI) => 0 Since the integrand is everywhere >= 1/2, the integral cannot be zero  in fact integrate(1/(sin(x)^2+1),x,q,q+k*%pi) = k*pi/sqrt(2) (real q, integral k) Presumably defint is using the indefinite integral atan(2*tan(x)/sqrt(2))/sqrt(2) inappropriately.  >Comment By: Raymond Toy (rtoy) Date: 20060901 17:12 Message: Logged In: YES user_id=28849 I think the problem is caused by INFR. I think it's supposed to compute how many full periods and fractional periods are in the integral, but it does it incorrectly. The following replacement: (defun infr (a) (let* ((q (igprt (div a (mul 2 '$%pi)))) (r (add a (mul 1 (mul q 2 '$%pi))))) (cons q r))) works much better for this example, and we get 3*pi/sqrt(2), as expected. In the results shown by Robert, ratsimp produces zero because atan is using the principal result, but defint is trying to tell you to be careful by returning atan(sqrt(2)*tan(3*%pi))...  Comment By: Robert Dodier (robert_dodier) Date: 20060730 23:46 Message: Logged In: YES user_id=501686 Observed in 5.9.3cvs. I find defint(1/(sin(x)^2+1),x,0,3*%pi); => sqrt(2)*atan(sqrt(2)*tan(3*%pi))/2 sqrt(2)*atan(sqrt(2)*tan(0))/2 but then ratsimp(%) => 0 .  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1044318&group_id=4933 
From: SourceForge.net <noreply@so...>  20060901 18:17:19

Bugs item #1547769, was opened at 20060828 05:36 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1547769&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 Submitted By: Ralf Stephan (rwst) Assigned to: Nobody/Anonymous (nobody) Summary: integrate(sqrt(x^3/(2*ax)),x,0,2*a); ==> internal error Initial Comment: (%i1) integrate(sqrt(x^3/(2*ax)),x,0,2*a); Is a positive, negative, or zero? pos; `sign' called on an imaginary argument: %i  an error. Quitting. To debug this try debugmode(true); (%i2) AFAIK, this indefinite integral should have a definite value.  >Comment By: Raymond Toy (rtoy) Date: 20060901 14:17 Message: Logged In: YES user_id=28849 Closing report. Maxima doesn't have the bug, and bata0 has been modified (defint.lisp, rev 1.27) to recognize this form and evaluate it correctly.  Comment By: Raymond Toy (rtoy) Date: 20060831 16:14 Message: Logged In: YES user_id=28849 Maxima can't evaluate the integral, but it can evaluate the equivalent integral integrate(sqrt(x^3)/sqrt(2*ax),x,0,2*a). The problem is bata0 doesn't recognize that sqrt(x^3/(2*ax)) has the form x^kk*(b*x^n+a)^l.  Comment By: Raymond Toy (rtoy) Date: 20060830 17:12 Message: Logged In: YES user_id=28849 I tried this with CVS maxima. I don't get the error; the integral is returned. Not sure if maxima should be able to evaluate this integral or not, though. It currently can't.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1547769&group_id=4933 
From: SourceForge.net <noreply@so...>  20060901 18:11:36

Bugs item #754823, was opened at 20030615 05:59 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=754823&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 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: integrate(x^2/sqrt(1x^2)/(1+x^2)) wrong Initial Comment: Maxima gives wrong result on the following integrands, x^2/sqrt(1x^2)/(1+a^2*x^2), x^2*sqrt(1x^2)/(1+a^2*x^2) and related ones asin(x)*x/(1+a^2*x^2), acos(x)*x/(1+a^2*x^2), acot(x)*x/(1+a^2*x^2), V.Pipin pip@...  >Comment By: Raymond Toy (rtoy) Date: 20060901 14:11 Message: Logged In: YES user_id=28849 Closing this report. We don't give wrong results.  Comment By: Raymond Toy (rtoy) Date: 20060410 11:31 Message: Logged In: YES user_id=28849 Current maxima returns the noun form of all of these integrals.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=754823&group_id=4933 