HI,
Try this:
DF$Station[DF$number%in%c(1,7,11,16)]<-"V1"
DF$Station[DF$number%in%c(4,14,20)]<-"V2"
DF$Station[DF$number%in%c(3,17,19)]<-"V3"
DF
# number data Station
#1 1 1 V1
#2 4 2 V2
#3 7 3 V1
#4 3 4 V3
#5 11 5 V1
#6 16 6 V1
#7 14 7 V2
#8 17 8 V3
#9 20 9 V2
#10 19 10 V3
#or if you have more replacement values, then:
library(car)
DF <- data.frame(number=c(1,4,7,3,11,16,14,17,20,19),data=c(1:10))
DF1<-DF1
DF1$Station<-recode(DF1$number,"c(1,7,11,16)='V1';c(4,14,20)='V2';c(3,17,19)='V3'")
DF1
# number data Station
#1 1 1 V1
#2 4 2 V2
#3 7 3 V1
#4 3 4 V3
#5 11 5 V1
#6 16 6 V1
#7 14 7 V2
#8 17 8 V3
#9 20 9 V2
#10 19 10 V3
A.K.
----- Original Message -----
From: jeff6868 <geoffrey_kl...@etu.u-bourgogne.fr>
To: r-help@r-project.org
Cc:
Sent: Wednesday, September 26, 2012 6:49 AM
Subject: [R] create new column in a DF according to values from another column
Hi everyone,
I have a small problem in my R-code.
Imagine this DF for example:
DF <- data.frame(number=c(1,4,7,3,11,16,14,17,20,19),data=c(1:10))
I would like to add a new column "Station" in this DF. This new column must
be automatically filled with: "V1" or "V2" or "V3".
The choice must be done on the numbers (1st column).
For example, I would like to have "V1" in the column "Station" in the rows
where the numbers of the 1st column are: 1,7,11,16 ; then I would like to
have "V2" in the rows where the numbers are: 4,14,20 and finally "V3" in the
rows where the numbers are: 3,17,19.
I'm trying with "if" and something like this, but it's not working yet:
# For "V1":
if(DF$number %in% c(1,7,11,16)) {test$Station=="V1"}
# For "V2":
...
So my final DF should look like this:
FINALDF <- data.frame(number=c(1,4,7,3,11,16,14,17,20,19),data=c(1:10),
Station=c("V1","V2","V1","V3","V1","V1","V2","V3","V2","V3"))
Could someone help me to finish this?
Thank you very much!!!
--
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