Dataframe and conditions

#this should also work

?within(X,a<- ifelse(b,c,a))
#? a???? b c
#1 2? TRUE 2
#2 2? TRUE 2
#3 1 FALSE 2
#4 1 FALSE 2
#5 1 FALSE 2
#6 2? TRUE 2
A.K.

----- Original Message -----
From: Pascal Oettli <kridox at ymail.com>
To: fgrelier <fgrelier at weborama.com>
Cc: r-help at r-project.org
Sent: Tuesday, May 14, 2013 4:47 AM
Subject: Re: [R] Dataframe and conditions

Hello,

One approach is using "ifelse":

X <- data.frame(a=c(1,1,1,1,1,1), 

b=c(TRUE,TRUE,FALSE,FALSE,FALSE,TRUE), c=c(2,2,2,2,2,2))

X

?  a? ?  b c
1 1? TRUE 2
2 1? TRUE 2
3 1 FALSE 2
4 1 FALSE 2
5 1 FALSE 2
6 1? TRUE 2

X <- within(X, a <- ifelse(b==TRUE, c, a))
X

?  a? ?  b c
1 2? TRUE 2
2 2? TRUE 2
3 1 FALSE 2
4 1 FALSE 2
5 1 FALSE 2
6 2? TRUE 2

Hope this helps,
Pascal

I have in a dataframe X? :? 3 Variables X$a , X$b, X$c
I would like to replace in X the values of X$a by the values of? X$c but
only when X$b=="TRUE"
I have tried to put in place a loop but as I have a lot of rows it is very
very long to run.

Thanks for your help





--
View this message in context: http://r.789695.n4.nabble.com/Dataframe-and-conditions-tp4667012.html
Sent from the R help mailing list archive at Nabble.com.

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.