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
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http://www.burns-stat.com
(home of 'Some hints for the R beginner'
and 'The R Inferno')
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
