CODEWITHSUNDEEP
r
user3096418
user3096418

Reputation: 17

How do I reassign data in R from words to binary 1's and 0's?

Right now I have a column of data that is "blue" or "green" and I want it to display a 1 for "blue" and 0 for "green." Any help?

Upvotes: 1

Views: 148

Answers (4)

Nate Pope
Nate Pope

Reputation: 1706

Evaluations of logical statements can be converted to binary values.

x = c("blue", "green", "blue")
as.integer(x == "blue")

Upvotes: 3

Josh O'Brien
Josh O'Brien

Reputation: 162321

This is a safer approach than several of the others given so far, because it won't silently miscode a value other than "blue" or "green" that happens to occur in your input vector x:

x <- c("blue", "green", "blue", "blue", "red")
match(x, c("green", "blue")) - 1
# [1]  1  0  1  1 NA

Alternatively (and even easier to arbitrarily extend), use the following (h.t. thelatemail):

val <- setNames(c(0,1,10), c("green", "blue", "red"))
x <- c("blue", "green", "blue", "blue", "red", "orange")
val[x]
# blue green  blue  blue   red  <NA> 
#    1     0     1     1    10    NA

Upvotes: 3

Pierre Lapointe
Pierre Lapointe

Reputation: 16277

Another way to do it

vec[vec=="blue"] <-1
vec[vec=="green"] <-0
as.numeric(vec)
#[1] 1 0 1 0 1 0

Upvotes: 1

Pierre Lapointe
Pierre Lapointe

Reputation: 16277

One way to do that (there are several)

vec <-rep(c("blue","green"),3)
ifelse(vec=="blue",1,0)
#[1] 1 0 1 0 1 0

Upvotes: 1

Related Questions