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$C. It's going to be more
successful if you use:
dfab[["A"]]*2
Thanks,
Miao
A=c(1,2,3)
B=c(4,6,7)
dfab<-data.frame(A,B)
C=dfab["A"]*2
D=dfab["B"]*3
dfcd<-data.frame(C,D)
dfcd
A B
1 2 12
2 4 18
3 6 21
dfcd$C
NULL
dfcd$A
[1] 2 4 6
[[alternative HTML version deleted]]
David Winsemius, MD
Alameda, CA, USA
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