I defined a data.frame by a two-dimensional array.
> aa = data.frame(rbind( 11:20, 1:10))
> aa
X1 X2 X3 X4 X5 X6 X7 X8 X9 X10
1 11 12 13 14 15 16 17 18 19 20
2 1 2 3 4 5 6 7 8 9 10
Now I want to use the data in the second line of aa which from 1 to 10 to
output.But I find that when I use the aa[[1]][1:10] and it seems be mistake.
aa[[1]][1:10]
[1] 11 1 NA NA NA NA NA NA NA NA
But when I just indice one element of the dataframe .e.g.aa[[1]][2]
It will be ok. How could I subset the data.frame data by lines?
Thank you ?
--
TANG Jie
Email: totang...@gmail.com
Tel: 0086-2154896104
Shanghai Typhoon Institute,China
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