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 <r-help@r-project.org>
Cc:
Sent: Wednesday, April 17, 2013 1:33 AM
Subject: [R] Transformation of a variable in a dataframe
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
> 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
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and provide commented, minimal, self-contained, reproducible code.
