Oats[Oats$Variety %in% c("Victory", "Golden Rain"),]
or
subset(Oats, Variety %in% c("Victory", "Golden Rain"))
Stefano
-----Messaggio originale-----
Da: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch]Per conto di elyakhlifi
mustapha
Inviato: luned? 23 aprile 2007 9.56
A: R-help at stat.math.ethz.ch
Oggetto: [R] extract from a data frame
hello,
I'd like know how to do to extract data from a frame for example
how can I do to extract only the data where variety=victory or variety=golden
rain
thanks.
> Oats
Block Variety nitro yield
1 I Victory 0.0 111
2 I Victory 0.2 130
3 I Victory 0.4 157
4 I Victory 0.6 174
5 I Golden Rain 0.0 117
6 I Golden Rain 0.2 114
7 I Golden Rain 0.4 161
8 I Golden Rain 0.6 141
9 I Marvellous 0.0 105
10 I Marvellous 0.2 140
11 I Marvellous 0.4 118
12 I Marvellous 0.6 156
13 II Victory 0.0 61
14 II Victory 0.2 91
15 II Victory 0.4 97
16 II Victory 0.6 100
17 II Golden Rain 0.0 70
18 II Golden Rain 0.2 108
19 II Golden Rain 0.4 126
20 II Golden Rain 0.6 149
21 II Marvellous 0.0 96
22 II Marvellous 0.2 124
23 II Marvellous 0.4 121
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