CODEWITHSUNDEEP
r
Jonas
Jonas

Reputation: 43

how to rename the variable´s of a column in a single line of code in R

I have this data frame, in the column state are the code number of a state, I want to changes the code number for the real name of the state in a single line of code.

As you can see this method that I use is very long

data <- data.frame(state=c(1,2,3,4,5),
                 Population=c(4779736,710231,6392017,2915918,37253956))

data$state[data$state==1]<-"Alabama"
data$state[data$state==2]<-"Alaska"
data$state[data$state==3]<- "Arizona"  
data$state[data$state==4]<- "Arkansas "
data$state[data$state==5]<-"California" 
data

Upvotes: 0

Views: 178

Answers (1)

akrun
akrun

Reputation: 887851

If the 'state' is numeric with sequence values starting from 1, then create a vector of state names in the same order as in the index and use the 'state' as index

data$state <- v1[data$state]

There is also state.name which would give all the US states.

data$state <- state.name[data$state]

data

v1 <- c("Alabama", "Alaska", "Arizona", "Arkansas", "California")

Upvotes: 2

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