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Subject: Re: Hashtables: is larger always better?

Author: James Swafford

Date: 20:42:29 09/22/01

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On September 22, 2001 at 22:17:06, Uri Blass wrote:

>On September 22, 2001 at 19:08:06, Torstein Hall wrote:
>
>>On September 22, 2001 at 18:29:46, Andreas De Troy wrote:
>>

>If the hash tables are very big then the probability for hash collision can
>increase and if there are enough hash collisions the result can be a bad move.
>
>Uri

Why do you think the size of the table has any bearing on the number
of collisions?  The number of collisions is a function of the
"uniqueness" of your key, not how many entries are in your table.

Maybe my definition of a collision is different than the norm:  I
define a collision as a match of the entire key between different
positions, not a match of the portion of the key used as a probe into
the table.

Either way, I don't see how making the hash table bigger increases the
chance of a collision.  Would you explain?

--
James



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