Dear R Help-Listers:
I have a problem that seems like it should have a simple solution, but I've
spent hours on it (and searching the r-help archives) to no avail. What I'd
like to do is to generate a new variable within a data frame, the values of
which are dependent upon the values of an existing variable within that data
frame.
Assume that I have the following data:
mydf<-data.frame(region=c(rep("North", 5), rep("East", 5), rep("South", 5),
rep("West", 5)))
Assume, in addition, that I have a factor vector with four values (I actually
have a factor with almost two-hundred values):
element<-c("earth", "water", "air", "fire")
I would like to add a new variable to the data frame (called "element") such
that the value of "element" is "earth" in each observation for which
mydf$region=="North", etc. In STATA, this was relatively easy; is there a
simple way to do this in R?
This is what the final result should look like:
> mydf
region element
1 North earth
2 North earth
3 North earth
4 North earth
5 North earth
6 East water
7 East water
8 East water
9 East water
10 East water
11 South air
12 South air
13 South air
14 South air
15 South air
16 West fire
17 West fire
18 West fire
19 West fire
20 West fire
Thanks in advance,
Josip
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