I am trying to make it so two columns with similar data use the same internal
numbers for same factors, here is the example:
> read.csv("test.csv",header =FALSE,sep=",")
V1 V2 V3
1 sun moon stars
2 stars moon sun
3 cat dog catdog
4 dog moon sun
5 bird plane superman
6 1000 dog 2000
> data <- read.csv("test.csv",header =FALSE,sep=",")
> str(data)
'data.frame': 6 obs. of 3 variables:
$ V1: Factor w/ 6 levels "1000","bird",..: 6 5 3 4 2 1
$ V2: Factor w/ 3 levels "dog","moon","plane": 2 2 1 2 3 1
$ V3: Factor w/ 5 levels "2000","catdog",..: 3 4 2 4 5 1
> as.numeric(data$V1)
[1] 6 5 3 4 2 1
> as.numeric(data$V2)
[1] 2 2 1 2 3 1
> as.factor(data$V1)
[1] sun stars cat dog bird 1000
Levels: 1000 bird cat dog stars sun
> as.factor(data$V2)
[1] moon moon dog moon plane dog
Levels: dog moon plane
So notice "dog" is 4 in V1, yet its 1 in V2. Is there a way, either on import,
or after, to have factors computed for both columns and assigned
the same internal values?
Brian
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