At 11:21 -0500 11/30/99, Jarvis, Robert P. wrote:
>  > -----Original Message-----
>>  From:	Peter Crowther [SMTP:Peter.Crowther at IT-IQ.com]
>>  Sent:	Tuesday, November 30, 1999 9:25 AM
>>  To:	'squeak at cs.uiuc.edu'
>>  Subject:	RE: Intervals
>>
>>  You're still assuming steps at, or of the order of, 1.
>>
><sigh>  Guilty as charged.  I also confess to having missed an edge
>condition.  Dare I hope for a velvet rope with which to be hung, m'lud?  :-)
>
>'From Squeak2.6 of 11 October 1999 [latest update: #1559] on 30 November
>1999 at 11:07:18 am'!

....SNIP...


I do think that #includes:, if allowed for an interval, should answer 
true for all values that 'anInterval asArray' includes (or, the 
equivalent, the set values passed to a #do: block) and false for 
others. This is not unreasonable and someone else today posted a 
solution (the same method that's in Collection).

However, it cannot be done with a simple computation. Fudge factors 
can only make it look right for your test cases. Try this interval 
with your code:

    (1.0e-200 to: 5.0e-200 by: 1.0e-200) asArray
    => (1.0e-200 2.0e-200 3.0e-200 4.0e-200 5.0e-200 )

Aren't floats fun!  :-)

Dave
_______________________________
David N. Smith
IBM T J Watson Research Center
Hawthorne, NY
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Any opinions or recommendations
herein are those of the author
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