Axiom Computer Algebra System - Patches: patch #2074, Bug #4733 (rounding of negative...

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patch #2074: Bug #4733 (rounding of negative numbers)

Submitter:	Bill Page <billpage1>
Submitted:	Wed 15 Oct 2003 04:07:07 AM UTC


Category:	None	Priority:	5 - Normal
Status:	Done	Privacy:	Public
Assigned to:	billpage1	Open/Closed:	Open

Sat 18 Oct 2003 03:35:10 PM UTC, comment #1:

I think this patch could be improved: the definition of shift2 could be modified to not do multiplications (and so presumably be faster).

I also wonder how much the original authors worried about rounding behaviour in some of these calls.

In the function 'normalize', for instance, the old semantics gave 'round towards 0' behaviour; using the new semantics of shift, it would be easy to give 'round towards -infinity' behaviour. But both are wrong: the right method for normalizing floating point numbers, to avoid accumulation of errors, is 'round towards even'.

Dylan Thurston <dpt>

Wed 15 Oct 2003 04:07:07 AM UTC, original submission:

Just adding Dylan's name, since he did most of the analysis work ...

Bill Page <billpage1>

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attached Files

file #6291: patch_item_2074.patch added by billpage1 (5KiB - text/plain - patch item 2074)

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Follow 3 latest changes.

Date	Changed by	Updated Field	Previous Value	Replaced by
2005-01-21	billpage1	Status	None	Done
2004-12-16	billpage1	Assigned to	None	billpage1
2003-10-15	billpage1	Patch Code	Modified - New Version

Axiom Computer Algebra System - Patches: patch #2074, Bug #4733 (rounding of negative...

patch #2074: Bug #4733 (rounding of negative numbers)

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