Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw

Re^2: [OT] The statistics of hashing.

by roboticus (Chancellor)
on Apr 02, 2012 at 14:07 UTC ( #963013=note: print w/ replies, xml ) Need Help??

in reply to Re: [OT] The statistics of hashing.
in thread [OT] The statistics of hashing.

Oh, something I forgot to mention: I tried using a constant number of bits but varying the vector size/quantity to see how things scaled. In other words, I compared:

vec size# vectors
10,000 1
5,000 2
3,333 3
2,500 4
2,000 5

I found more smaller vectors works better until the number of samples matches the number if bits in the smaller vector. Plotting the functions:

(1-exp(-x/1000))^10 (1-exp(-x/2000))^5 (1-exp(-x/2500))^4 (1-exp(-x/3333))^3 1-exp(-x/10000)

using a graphing calculator shows that's where the curves cross:


When your only tool is a hammer, all problems look like your thumb.

Comment on Re^2: [OT] The statistics of hashing.
Download Code

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://963013]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others scrutinizing the Monastery: (11)
As of 2015-12-01 17:54 GMT
Find Nodes?
    Voting Booth?

    My keyboard shows this many letters:

    Results (24 votes), past polls