[R] split the data.frame
YIHSU CHEN
yschen at jhu.edu
Tue May 16 05:45:58 CEST 2006
Dear R folks:
I wonder anyone has a elegent way of doing what I need to do.
I have a data frame called with four columns: V1, V2, A1 and A2:
V1 V2 A1 A2
A B 1.2 2.0
A D 1.2 4.0
A C 2.4 2.2
What I need to do is to convert it into the following data frame with a new column x, where x is just the stacked up of A1 and A2 placed with respective V1 and V2 in the first two columns:
V1 V2 x
A B 1.2
A B 2.0
A D 1.2
A D 4.0
A C 2.4
A C 2.2
I wonder whether there is an efficient way to do it since I have huge dataset.
Thank you very much
Yihsu
Yihsu Chen
The Johns Hopkins University
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