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

[Arun Giridhar]

Update of bug #64692 (project octave):

                Category:             Interpreter => None                   
                  Status:               Confirmed => None                   
                 Release:                   8.3.0 => 6.4.0                  

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Follow-up Comment #2:

Comment: this seems to be a conscious choice as shown by comments in Range.h
and Range.cc.

Example:
https://hg.savannah.gnu.org/hgweb/octave/file/489e63504a94/liboctave/array/Range.h#l58

// LIMIT is an upper limit and may be outside the range of actual values.  For
floating point ranges, we perform a tolerant check to attempt to capture limit
in the set of values if it is "close" to the value of base + a multiple of the
increment.

There are various helper functions in Range.cc aimed at achieving that
effect.

Since the numerical value of -2.7e-17 is close to 0, the 0 gets included. If
the final value is more than some 2.3e-15 away, then it is not included. 

Speaking for myself, this behavior seems to be less astonishing than strict
application of limit rules due to floating point artifacts.

What do others think?


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