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MathGroup Archive 2005

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Re: associative arrays

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58179] Re: [mg58137] associative arrays
  • From: Ed Peschko <esp5 at mdssdev05.comp.pge.com>
  • Date: Tue, 21 Jun 2005 06:02:56 -0400 (EDT)
  • References: <d8rnfg$l4b$1@smc.vnet.net> <200506181007.GAA08771@smc.vnet.net> <200506190744.DAA05732@smc.vnet.net> <E89993C2-F308-430B-9064-8248DEF9D0C8@jeol.com>
  • Sender: owner-wri-mathgroup at wolfram.com

On Mon, Jun 20, 2005 at 09:05:21AM -0400, Sseziwa Mukasa wrote:
> 
> On Jun 19, 2005, at 3:44 AM, Ed Peschko wrote:
> 
> >hey all,
> >
> >Is there a simple way to make an associative array in mathematica?
> >
> >I noticed that there's a sparse array, but I'd like to be able to
> >use a non-numeric value as key..
> 
> Don't use arrays, use pattern matching eg:
> 
> f[key1]=value1
> f[key2]=value2
> .

that does some things that I want, but I'm not sure if this is a 'true' 
associative array, like perl's or python's dictionaries..

Can you:

	a) list the keys in a given order, and iterate over them?
	b) do true, multi-dimentional hashes, where both the key and 
           the value of the hash are either other hashes, or lists?


I know you can do ?f to list the values, but I'd like to be able to do
the 2 items above programatically.

Ed


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