[Octave-bug-tracker] [bug #64692] colon range includes an extra value

[Arun Giridhar]

Update of bug #64692 (project octave):

                Severity:              3 - Normal => 2 - Minor              
                Priority:              5 - Normal => 3 - Low                

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Follow-up Comment #9:

Just for comparison, I ran this in Nelson (version '0.7.9.0 (Freedom)') . Here
is what I got:


>> 0.3 - 0.1 - 0.2
ans =
  -2.7756e-17

>> -2 : (0.3 - 0.1 - 0.2)
ans =
    -2    -1     0

>> 1.8 : 0.05 : 1.9
ans =
    1.8000    1.8500

>> 1.9 : -0.05 : 1.8
ans =
    1.9000    1.8500


It seems to indicate that the question of deducing intent in the presence of
floating point roundoff is subjective at best, so there's no single way to
cover all cases. Each program does its own thing, even when they're aiming for
compatibility.

If anyone wants to experiment with Octave's rounding rules for ranges, they're
in Range.cc, in the functions xteq() and xnumel_internal().

Lowering the priority for this bug, since there are many workarounds.


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