Besides data.table, there's the hash package. It does not use data.frame
type structures but is a bit more flexible.
Marsh Feldman
On 5/30/10 [May 30, 10] 6:00 AM, r-help-requ...@r-project.org wrote:
Message: 40
Date: Sun, 30 May 2010 09:24:22 +0100
From: Patrick Burns<pbu...@pburns.seanet.com>
To:r-help@r-project.org,alan....@gmail.com
Subject: Re: [R] Data Frame as Hash Table
Message-ID:<4c0220b6.7090...@pburns.seanet.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
You might want to investigate the 'data.table'
package.
On 30/05/2010 09:03, Alan Lue wrote:
> I'm interested in using a data frame as if it were a hash table. For
> instance if I had the following,
>
>> (d<- data.frame(key=seq(0.5, 3, 0.5), value=rnorm(6)))
> key value
> 1 0.5 -1.118665122
> 2 1.0 0.465122921
> 3 1.5 -0.529239211
> 4 2.0 -0.147324638
> 5 2.5 -1.531503795
> 6 3.0 -0.002720434
>
> Then I'd like to be able to quickly retrieve the "value" of "key" 1.5
> to get -0.53. How would one go about doing this?
>
> Yours,
> Alan Lue
>
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-- Patrick Burns pbu...@pburns.seanet.com http://www.burns-stat.com
(home of 'Some hints for the R beginner' and 'The R Inferno')
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