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From: SourceForge.net <noreply@so...>  20030801 23:33:58

Bugs item #771133, was opened at 20030714 13:26 Message generated for change (Comment added) made by willisb You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=771133&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Barton Willis (willisb) Assigned to: Nobody/Anonymous (nobody) Summary: double overflow => 0.0e0 Initial Comment: (C1) ?most\positive\double\float; (D1) 1.7976931348623157e+308 (C2) 1.7976931348623157e+308; (D2) 1.7976931348623157e+308 (C3) 1.7976931348623158e+308; (D3) 1.7976931348623157e+308 No problem sofar; but a problem here (C4) 1.7976931348623159e+308; (D4) 0.e+0 (C17) build_info(); Maxima version: 5.9.0rc3 Maxima build date: 15:25 5/11/2003 host type: i686pclinuxgnu lispimplementationtype: CMU Common Lisp lispimplementationversion: 18d (D17) Barton  >Comment By: Barton Willis (willisb) Date: 20030801 18:33 Message: Logged In: YES user_id=570592 From a cmucl prompt, I get a overflow error. So this has something to do with Maxima. From Maxima, look what readfromstring does (C1) :lisp(trace makenumber readlist readfromstring); (MAKENUMBER READLIST READFROMSTRING) (C1) 1.7976931348623159e+308; 0: (MAKENUMBER ((#\3 #\0 #\8) (#\+) (#\E) (#\7 #\9 #\7 #\6 #\9 ...) (#\.) ...)) 1: (READLIST (#\1 #\. #\7 #\9 #\7 ...)) 2: (READFROMSTRING "1.7976931348623159E+308" NIL NIL :START ...) Debug: Both still valid #.(SYSTEM:INTSAP #x3FFFE79C) #. (SYSTEM:INTSAP #x282D1FED) #.(SYSTEM:INTSAP #x3FFFE6B4) #.(SYSTEM:INTSAP #x08053383) 2: READFROMSTRING returned 0.0 23 Debug: Both still valid #.(SYSTEM:INTSAP #x3FFFE79C) #. (SYSTEM:INTSAP #x282D1FED) #.(SYSTEM:INTSAP #x3FFFE6B4) #.(SYSTEM:INTSAP #x08053383) 1: READLIST returned 0.0 23 Debug: Both still valid #.(SYSTEM:INTSAP #x3FFFE79C) #. (SYSTEM:INTSAP #x282D1FED) #.(SYSTEM:INTSAP #x3FFFE6B4) #.(SYSTEM:INTSAP #x08053383) 0: MAKENUMBER returned 0.0 23 (D1) 0.e+0 Compare with (C2) 1.7976931348623158e+308; 0: (MAKENUMBER ((#\3 #\0 #\8) (#\+) (#\E) (#\7 #\9 #\7 #\6 #\9 ...) (#\.) ...)) 1: (READLIST (#\1 #\. #\7 #\9 #\7 ...)) 2: (READFROMSTRING "1.7976931348623158E+308" NIL NIL :START ...) Debug: Both still valid #.(SYSTEM:INTSAP #x3FFFE79C) #. (SYSTEM:INTSAP #x282D1FED) #.(SYSTEM:INTSAP #x3FFFE6B4) #.(SYSTEM:INTSAP #x08053383) 2: READFROMSTRING returned 1.7976931348623157e+308 23 Debug: Both still valid #.(SYSTEM:INTSAP #x3FFFE79C) #. (SYSTEM:INTSAP #x282D1FED) #.(SYSTEM:INTSAP #x3FFFE6B4) #.(SYSTEM:INTSAP #x08053383) 1: READLIST returned 1.7976931348623157e+308 23 Debug: Both still valid #.(SYSTEM:INTSAP #x3FFFE79C) #. (SYSTEM:INTSAP #x282D1FED) #.(SYSTEM:INTSAP #x3FFFE6B4) #.(SYSTEM:INTSAP #x08053383) 0: MAKENUMBER returned 1.7976931348623157e+308 23 (D2) 1.7976931348623e+308 (C3) build_info(); Maxima version: 5.9.0rc3 Maxima build date: 15:25 5/11/2003 host type: i686pclinuxgnu lispimplementationtype: CMU Common Lisp lispimplementationversion: 18d Barton  Comment By: Stavros Macrakis (macrakis) Date: 20030801 16:00 Message: Logged In: YES user_id=588346 GCL 2.5.0 does not have this problem.  Comment By: Raymond Toy (rtoy) Date: 20030729 10:08 Message: Logged In: YES user_id=28849 Interesting. Can you try with 18e or a recent snapshot? A snapshot of CMUCL running on a sparc gets a floatingpointoverflow Lisp error, as expected.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=771133&group_id=4933 
From: SourceForge.net <noreply@so...>  20030801 22:30:02

Bugs item #781753, was opened at 20030801 17:13 Message generated for change (Comment added) made by rtoy You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=781753&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Stavros Macrakis (macrakis) >Assigned to: Raymond Toy (rtoy) Summary: bfloat>float fails for very large and very small Initial Comment: sm: 2.0b0^1024.00001b0 => 5.5626...B309 (OK) float(sm) => 0.0 NO! true for all smaller sm's but floats can represent numbers down to 4.94e324 float(8.989b307) => nonnumber but floats can represent numbers up to 1.797693134862316E+308 A much more minor problem: though 2.8e324 correctly reads in as 4.94e324 (rounded), 2.7e324 reads in as 0.0. This is a GCL problem. These may be fixed in more recent GCLs, but should still be checked in Maxima. Maxima 5.9.0 GCL 2.5.0 mingw Windows 2000 Athlon  >Comment By: Raymond Toy (rtoy) Date: 20030801 18:30 Message: Logged In: YES user_id=28849 The float(sm) issue appears to be a GCL problem. CMUCL doesn't do that. (Perhaps GCL defaults to truncatetozero?) The overflow issue is caused by trying to compute 0.5 * 2^1024, and 2^1024 doesn't fit in a doublefloat. A fix using scalefloat instead solves this problem. CMUCL doesn't have problems with 2.7e324 becoming 0.0.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=781753&group_id=4933 
From: SourceForge.net <noreply@so...>  20030801 22:16:18

Bugs item #781788, was opened at 20030801 18:16 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=781788&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: scalar/matrix addition inconsistent Initial Comment: I claim that componentwise addition of scalars to matrices is wrong. By default, doallmxops=true. Define m:matrix([a,b],[c,d]). Calculate ratsimp(m.m^^1+m). This yields matrix ([a+1,b],[c,d+1]). Good. Now calculate subst(m,n,n.n^^1+n). This yields matrix ([a+1,b+1],[c+1,d+1]). I believe this is wrong. Note that this happens even when dotident is not equal to 1. Only if dotexptsimp=false (which is a pretty radical restriction) does the subst case match the nonsubst case. As far as I can tell, the only sensible thing for scalar+matrix to mean is scalar*identitymatrix + matrix. I do not believe that componentwise addition of scalar to matrix is ever useful; if it is, you can always write it as scalar*allonesmatrix + matrix. Note that scalar/matrix *multiplication* is a completely different matter  componentwise is perfectly meaningful and useful there. Maxima 5.9.0  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=781788&group_id=4933 
From: SourceForge.net <noreply@so...>  20030801 21:13:46

Bugs item #781753, was opened at 20030801 17:13 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=781753&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: bfloat>float fails for very large and very small Initial Comment: sm: 2.0b0^1024.00001b0 => 5.5626...B309 (OK) float(sm) => 0.0 NO! true for all smaller sm's but floats can represent numbers down to 4.94e324 float(8.989b307) => nonnumber but floats can represent numbers up to 1.797693134862316E+308 A much more minor problem: though 2.8e324 correctly reads in as 4.94e324 (rounded), 2.7e324 reads in as 0.0. This is a GCL problem. These may be fixed in more recent GCLs, but should still be checked in Maxima. Maxima 5.9.0 GCL 2.5.0 mingw Windows 2000 Athlon  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=781753&group_id=4933 
From: SourceForge.net <noreply@so...>  20030801 21:00:45

Bugs item #771133, was opened at 20030714 14:26 Message generated for change (Comment added) made by macrakis You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=771133&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Barton Willis (willisb) Assigned to: Nobody/Anonymous (nobody) Summary: double overflow => 0.0e0 Initial Comment: (C1) ?most\positive\double\float; (D1) 1.7976931348623157e+308 (C2) 1.7976931348623157e+308; (D2) 1.7976931348623157e+308 (C3) 1.7976931348623158e+308; (D3) 1.7976931348623157e+308 No problem sofar; but a problem here (C4) 1.7976931348623159e+308; (D4) 0.e+0 (C17) build_info(); Maxima version: 5.9.0rc3 Maxima build date: 15:25 5/11/2003 host type: i686pclinuxgnu lispimplementationtype: CMU Common Lisp lispimplementationversion: 18d (D17) Barton  >Comment By: Stavros Macrakis (macrakis) Date: 20030801 17:00 Message: Logged In: YES user_id=588346 GCL 2.5.0 does not have this problem.  Comment By: Raymond Toy (rtoy) Date: 20030729 11:08 Message: Logged In: YES user_id=28849 Interesting. Can you try with 18e or a recent snapshot? A snapshot of CMUCL running on a sparc gets a floatingpointoverflow Lisp error, as expected.  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=771133&group_id=4933 
From: SourceForge.net <noreply@so...>  20030801 20:45:17

Bugs item #781726, was opened at 20030801 16:45 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=781726&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Stavros Macrakis (macrakis) Assigned to: Nobody/Anonymous (nobody) Summary: Problems with IEEEfloat NaN and INF Initial Comment: flinf: 2.0^1024$ flinf => Error: Can't print a nonnumber (lisp break) Should print something special, e.g. INFe0 flnan: flinfflinf$ flnan => Bind stack overflow (lisp break) Should print something special, e.g. NaNe0 is(flnan=flnan) => TRUE NO! NaN is not equal to itself; cf ?=(flnan,flnan). is(flnan>0) => TRUE NO! is(flnan<0) => TRUE NO! flnan*0 => 0 NO! flinf*0 => 0 NO! GCL also can't print flnan/flinf. Maxima 5.9.0 gcl 2.5.0 mingw Windows 2000 Athlon  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=781726&group_id=4933 
From: SourceForge.net <noreply@so...>  20030801 18:30:21

Bugs item #781657, was opened at 20030801 13:30 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=781657&group_id=4933 Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Barton Willis (willisb) Assigned to: Nobody/Anonymous (nobody) Summary: binomial(x,x) => 1, but binomial(1,1) => 0 Initial Comment: binomial(x,x) simplifies to 1 yet binomial(1,1) simplifies to 0. (C1) binomial(x,x); (D1) 1 (C2) binomial(1,1); (D2) 0 I agree with (d2) because: 1/(1  x) = 1 + x + x^2 + ... = sum(binomial(1,k) (x) ^k,k,0,inf) implies binomial(1,k) = (1)^k, for integers k >= 0. In the recursion relation [Knuth Vol 1, 1.2.6 Eq. (20)] binomial(r,k) = binomial(r1,k) + binomial(r1,k1) set r > 0, k > 0, and use binomial(0,0) = 1 and binomial (1,0) = 1. From this we get binomial(1,1) = 0. Also see, Knuth Vol. 1 (third edition), Section 1.2.6 Exercise 9. There may be other approaches, but I think using the recursion relations and other identities to extend the domain of the binomial function is the best method. In short, I think the simplification binomial(x,x) ==> 1 should happen only for real x with x >= 0. Barton  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=781657&group_id=4933 