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From: SourceForge.net <noreply@so...>  20120422 14:21:10

Bugs item #3520321, was opened at 20120422 07:21 Message generated for change (Tracker Item Submitted) made by You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3520321&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: https://www.google.com/accounts () Assigned to: Nobody/Anonymous (nobody) Summary: inconsistency with complex numbers? Initial Comment: Dear developers and users of Maxima, troubleshooting a program of mine, I have discovered a Maxima's behaviour which appears inconsistent to me. There is a strange utilization of integer, real and complex numbers. Input of the example: kill(all)$ a: 0.1+%i*0.0; b: 0.0+%i*0.0; c: 0.0+%i*0.1; d: 0.1+%i*0.1; realpart(b); realpart(c); is(realpart(a)=realpart(d)); is(realpart(b)=realpart(c)); is(imagpart(c)=imagpart(d)); is(imagpart(a)=imagpart(b)); exp(%i*0); exp(%i*0.0); limit(exp(%i*x),x,0.0,plus); is(limit(exp(%i*x),x,0.0,plus)=exp(%i*0.0)); build_info(); output of the example: 0.1 0.0 0.1*%i 0.1*%i+0.1 0.0 0 true false true true 1 1.0 1 false Maxima version: 5.26.0 Maxima build date: 22:48 1/15/2012 Host type: i686pcmingw32 Lisp implementation type: GNU Common Lisp (GCL) Lisp implementation version: GCL 2.6.8 Particularly interesting the tests: is(realpart(b)=realpart(c)) is(limit(exp(%i*x),x,0.0,plus)=exp(%i*0.0)) both should produce true rather than false. Any idea about? Do I improperly/wrongly use Maxima? Is it a Maxima's bug? Thanks in advance for your support. Kind Regards Claudio  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3520321&group_id=4933 
From: SourceForge.net <noreply@so...>  20120422 11:44:17

Bugs item #3510745, was opened at 20120324 02:09 Message generated for change (Comment added) made by dgildea You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3510745&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: Works For Me Priority: 5 Private: No Submitted By: drunas97 (drunas97) Assigned to: Nobody/Anonymous (nobody) Summary: integrate gives strange results Initial Comment:  Maxima version: 5.26.0 Maxima build date: 22:48 1/15/2012 Host type: i686pcmingw32 Lisp implementation type: GNU Common Lisp (GCL) Lisp implementation version: GCL 2.6.8  I try to integrate functions of such a type: Kvar(f,N,t1,t2):=N/(N1)*(sin(%pi*f*t2)/(%pi*f*t2))^2*(1(sin(N*%pi*f*t1)/(N*sin(%pi*f*t1)))^2) they all are absolutely integrable. but maxima gives: integrate(Kvar(f,2,1,1),f,0,inf); defint: integral is divergent.  an error. To debug this try: debugmode(true); integrate(Kvar(f,2,1,1),f,0,inf),numer; 0.15915494309189*%pi integrate(Kvar(f,2,1,1),f,0.0,inf),numer; `quotient' by `zero'  an error. To debug this try: debugmode(true); I thought the mistakes originate from defining Kvar(f,N,t1,t2) at f=0 (0/0), so i changed the integration limits: integrate(Kvar(f,2,1,1),f,0.1,1); (2*%i*%pi*gamma_incomplete(1,4*%i*%pi)4*%i*%pi*gamma_incomplete(1,2*%i*%pi)2*%i*%pi*gamma_incomplete(1,(2*%i*%pi)/5)+4*%i*%pi*gamma_incomplete(1,(%i*%pi)/5) 4*%i*%pi*gamma_incomplete(1,(%i*%pi)/5)+2*%i*%pi*gamma_incomplete(1,(2*%i*%pi)/5)+4*%i*%pi*gamma_incomplete(1,2*%i*%pi)2*%i*%pi*gamma_incomplete(1,4*%i*%pi)27 )/(4*%pi^2) integrate(Kvar(f,2,1,1),f,0.1,1),numer; `quotient' by `zero'  an error. To debug this try: debugmode(true); At the same time: quad_qag(Kvar(f,2,1,1),f,0.1,1,6); [0.42152826647711,4.6799038697321796*10^15,61,0]  >Comment By: Dan Gildea (dgildea) Date: 20120422 04:44 Message: seems to be fixed in current sources. (%i13) Kvar(f,N,t1,t2):=N/(N1)*(sin(%pi*f*t2)/(%pi*f*t2))^2*(1(sin(N*%pi*f*t1)/(N*sin(%pi*f*t1)))^2); (%o13) Kvar(f,N,t1,t2):=N/(N1)*(sin(%pi*f*t2)/(%pi*f*t2))^2 *(1(sin(N*%pi*f*t1)/(N*sin(%pi*f*t1)))^2) (%i14) integrate(Kvar(f,2,1,1),f,0,inf); (%o14) 1/2  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3510745&group_id=4933 