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Subject: Re: significant math

Author: Robert Hyatt

Date: 13:51:36 11/19/02

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On November 19, 2002 at 16:38:37, Gian-Carlo Pascutto wrote:

>On November 19, 2002 at 16:31:15, Russell Reagan wrote:
>
>>You need to clearly define what the hell you want then. Vincent too. You two sit
>>there and demand proof or evidence without providing any of your own, and then
>>when someone provides what you ask for you say "That's not what I asked for." or
>>"that isn't valid" or whatever the excuse of the day is. Make it clear what you
>>want, or don't ask.
>>
>>Sounds an awfully lot like what goes on at r.g.c.c to me. People responding >with stupid things like, "No..." with no "evidence" to support it.
>
>I'm not providing any evidence because I've never made a statement
>as to what is generally the best datastructure to use.
>
>I don't think it's a good idea to do so without having substantial
>evidence that you are right, and I don't have it. And from what I
>have seen, neither have any of the other posters in this thread.
>
>--
>GCP

I have never made such a statement either.  I _specifically_ have said, many
times, that on
32 bit machines, bitmaps seem to "break even".  On 64 bit architectures, they
have a speed
advantage.  That should be intuitively obvious to anyone that has ever studied
computer
architecture.  It was the basis for developing 32 bit machine when many said "16
is enough".
It is now the basis for developing 64 bit machines when many still say "32 is
enough".

I have done _both_ approaches.  I have found some things harder to do in
bitmaps.  Some
easier.  I don't believe _either_ is inherently better as a data structure,
until you factor in 64
bit architectures.  Then data structures that directly use the added bits of a
64 bit architecture
will gain more than data structures that don't.  That is both plain to see and
simple to understand
why it is true...





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