Or this ;
example$X3 <- c(-3, -1, 1, 3)[ example$X2 ]
Romain
On 01/14/2010 11:55 AM, Henrique Dallazuanna wrote:
Try this:
example$X3<- sapply(example$X2, switch, -3, -1, 1, 3)
On Thu, Jan 14, 2010 at 5:05 AM, Joshua Wiley<jwiley.ps...@gmail.com> wrote:
Hello All,
I am trying to create a column of weights based off of factor levels
from another column. I am using the weights to calculate L scores.
Here is an example where the first column are scores, the second is my
"factor" and the third I want to be a column of weights. I can do
what I want with an ifelse statement (see below), but I am wondering
if anyone knows of a cleaner way to do this?
example<- data.frame(cbind(rnorm(4), rep(1:4, 1), c(0)))
example$X3<- ifelse(example$X2==1, -3, (
ifelse(example$X2==2, -1, (
ifelse(example$X2==3, 1, (
ifelse(example$X2==4, 3, NA))))))) ## this seems sloppy to me
example
X1 X2 X3
1 1.75308880 1 -3
2 -0.49273616 2 -1
3 -0.12446648 3 1
4 -0.06417217 4 3
Thanks for your help,
Joshua
--
Joshua Wiley
Senior in Psychology
University of California, Riverside
http://www.joshuawiley.com/
--
Romain Francois
Professional R Enthusiast
+33(0) 6 28 91 30 30
http://romainfrancois.blog.free.fr
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