On Apr 16, 2013, at 10:33 PM, jpm miao wrote:
HI,
I have a dataframe with two variable A, B. I transform the two
variable
and name them as C, D and save it in a dataframe dfcd. However, I
wonder
why can't I call them by dfcd$C and dfcd$D?
Because you didn't assign them to dfab$C.
Hi,
You may also try:
dfab-data.frame(A,B)
library(plyr)
dfcd-subset(mutate(dfab,C=A*2,D=B*3),select=-c(A,B))
#or
dfcd1-subset(within(dfab,{D-B*3;C-A*2}),select=-c(A,B))
dfcd$C
#[1] 2 4 6
dfcd$D
#[1] 12 18 21
A.K.
- Original Message -
From: jpm miao miao...@gmail.com
To: r-help
HI,
I have a dataframe with two variable A, B. I transform the two variable
and name them as C, D and save it in a dataframe dfcd. However, I wonder
why can't I call them by dfcd$C and dfcd$D?
Thanks,
Miao
A=c(1,2,3)
B=c(4,6,7)
dfab-data.frame(A,B)
C=dfab[A]*2
D=dfab[B]*3
Hi,
Because a column name exists for C and D:
colnames(C)
[1] A
colnames(D)
[1] B
One possibility:
A=c(1,2,3)
B=c(4,6,7)
dfab-data.frame(A,B)
C=dfab$A*2
D=dfab$B*3
dfcd-data.frame(C,D)
dfcd
C D
1 2 12
2 4 18
3 6 21
dfcd$C
[1] 2 4 6
HTH,
Pascal
On 04/17/2013 02:33 PM, jpm miao
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