On Sep 1, 2011, at 1:53 PM, Changbin Du wrote:
HI, Dear R community,
I want to split a data frame by using two variables: let and g
x = data.frame(num =
c(10,11,12,43,23,14,52,52,12,23,21,23,32,31,24,45,56,56,76,45), let =
letters[1:5], g = 1:2)
x
num let g
1 10 a 1
2 11 b 2
3 12 c 1
4 43 d 2
5 23 e 1
6 14 a 2
7 52 b 1
8 52 c 2
9 12 d 1
10 23 e 2
11 21 a 1
12 23 b 2
13 32 c 1
14 31 d 2
15 24 e 1
16 45 a 2
17 56 b 1
18 56 c 2
19 76 d 1
20 45 e 2
I tried the following:
xs = split(x,x$g*x$let)
Probably
xs = split(x,list(x$g,x$let))
*Warning message:
In Ops.factor(x$g, x$let) : * not meaningful for factors*
xs = split(x,c(x$g*x$let))
*Warning message:
In Ops.factor(x$g, x$let) : * not meaningful for factors
*
Can someone give some hints?
Thanks!
--
Sincerely,
Changbin
--
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