From: SourceForge.net <noreply@so...>  20080922 23:54:26

Bugs item #2123651, was opened at 20080922 19:54 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=2123651&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  Complex Group: Includes proposed fix Status: Open Resolution: None Priority: 5 Private: No Submitted By: The Henman (rvh2007) Assigned to: Nobody/Anonymous (nobody) Summary: min and max of imaginary and real numbers Initial Comment: There was a discussion about an infinity correct Maxima, was the issue resolved? Anyway I also found this problem with Max and Min. When comparing imaginary and real inf I think returning the noun form is the only right answer. I think the same is true for complex numbers and max and min usually work but I see one case below where you get an error message. If you do this min(a+b*i, a+b*i) or max(a+b*i, a+b*i) then you should get a+b*i even if a and b are +inf. I think these are all wrong, except for %o14 (%i5) min(%i*inf,inf); (%o5) %i inf (%i6) min(%i*minf,minf); (%o6) minf (%i7) (%i5) min(%i*inf,inf); (%o5) %i inf (%i6) min(%i*minf,minf); (%o6) minf (%i7) min(%i*inf,inf); (%o7) minf (%i8) min(%i*inf,minf); (%o8) minf (%i9) min(%i*minf,inf); (%o9) minf (%i10) max(%i*minf,inf); (%o10) inf (%i11) max(%i*minf,minf); (%o11) %i minf (%i12) max(%i*inf,inf); (%o12) inf (%i13) min(%i*inf,inf); (%o13) %i inf (%i14) max(%i*inf,inf); (%o14) max( inf,  %i inf) (%i15) max(%i*minf,minf); (%o15) %i minf The noun form is returned in only one case that I have found above. For complex number there is also this min bug in (%i4). (%i1) max(7*%i*inf+4*inf,4*%i*inf+3); (%o1) max(4 %i inf + 3, 7 %i inf + 4 inf) (%i2) min(7*%i*inf+4*inf,4*%i*inf+3); (%o2) min(7 %i inf + 4 inf, 4 %i inf + 3) (%i3) min(7*%i*minf+4*inf,4*%i*minf+3); (%o3) min(7 %i minf + 4 inf, 4 %i minf + 3) (%i4) min(7*%i*minf+4*inf,4*%i*inf+3); The sign of und is undefined  an error. To debug this try debugmode(true); There is one other with real infinity. Try (%i5) min(inf,minf); (%o5) inf (%i6) max(inf,minf); The sign of und is undefined  an error. To debug this try debugmode(true) These last two shoud not return and noun form but %i6 should not give an error either. In my humble opinion. Rich (%i1) build_info()$ Maxima version: 5.16.3 Maxima build date: 22:48 8/24/2008 host type: i686pcmingw32lispimplementationtype: GNU Common Lisp (GCL)lispimplementationversion: GCL 2.6.8  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2123651&group_id=4933 