[R] Newbie: Subsets of data frame

Morten Sickel Morten.Sickel at nrpa.no
Mon Sep 23 16:58:43 CEST 2002


I feel a bit embarassed by this, but I have not managed to find out how:

I have a data frame containing measurements over time for a number of
different locations:

> str(milk)
`data.frame':   845 obs. of  3 variables:
 $ date    : num  1987 1987 1987 1987 1987 ...
 $ value   : num  5 1 2 5 1 1 2 3 2 4 ...
 $ location: Factor w/ 36 levels "Alta","Andøy",..: 1 1 1 1 1 1 1 1 1 1 ...

I assume there is some simpe way of extracting subsets of the data frame for
analysing the time series for just one of the location, but how? I have
tried using various variants of extract, [] and subset, but obiously, I have
missed something, for I have not managed to get out what I want. 

-- 
Morten Sickel
Norwegian Radiation Protection Authority 

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