Drexel dragonThe Math ForumDonate to the Math Forum


Math Forum
 Ask Dr. Math
 Discussions
 Internet Newsletter
 MathTools
 Problems of the Week
 Teacher2Teacher
 Teacher Exchange
 Workshops

Search All of the Math Forum:
Browse our Internet Mathematics Library

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.math.mathematica

Topic: How best to implement a hash table in Mathematica
Replies: 15   Last Post: Feb 24, 2012 1:00 AM

Advanced Search
Reply to this Topic Reply to this Topic

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Joseph Gwinn

Posts: 101
Registered: 2/23/05
Re: How best to implement a hash table in Mathematica
Posted: Feb 20, 2012 2:49 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

In article <jhqmsq$fbt$1@smc.vnet.net>,
Richard Fateman <fateman@cs.berkeley.edu> wrote:

> On 2/18/2012 3:28 AM, Joseph Gwinn wrote:
> > I have an application that resembles dictionary lookup, with significant
> > rates of collision.
> >
> >...
>
> Mathematica presumably already uses hashing for storage of stuff like
>
> f[{a,b,c}] = value1
> f[{1,2,c}] = value2
>
> etc.
>
> Initializing a hashtable with 10^4 (identical?) empty keys makes no
> sense. Did I misunderstand your message?

No, you understood correctly. Please see my response to David Bailey
for the rationale.

Joe Gwinn

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2013. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.