CODEWITHSUNDEEP
rr-factor
Irm
Irm

Reputation: 19

Convert 2-level factor to TRUE / FALSE

I have to convert this class to True and False

Class          : Factor w/ 2 levels "benign","malignant": 1 1 1 1 1 2 1 1 1 1

I already tried it to convert it to a numeric, by 

as.numeric(BreastCancer$Class)
as.integer(BreastCancer$Class)

then I did

as.logical(BreastCancer$Class)

but I only get NA's.

I tried to use the install packages dplyr for recoding, but I can not figure out how that works.

Upvotes: 2

Views: 1020

Answers (2)

ozanstats
ozanstats

Reputation: 2864

It is important to keep track of what you are coding as TRUE or FALSE:

vec_factor <- factor(
  c(1, 1, 1, 1, 1, 2, 1, 1, 1, 1), 
  labels = c("benign", "malignant")
)
str(vec_factor)
# Factor w/ 2 levels "benign","malignant": 1 1 1 1 1 2 1 1 1 1

vec_logical <- as.logical(as.integer(vec) == 1)
str(vec_logical)
# logi [1:10] TRUE TRUE TRUE TRUE TRUE FALSE ...

Update:

As @zx8754 commented, as.logical is redundant:

str(as.integer(vec) == 1)
# logi [1:10] TRUE TRUE TRUE TRUE TRUE FALSE ...

and @李哲源's answer is much more elegant.

Upvotes: 1

zx8754
zx8754

Reputation: 56219

Maybe simply:

BreastCancer$ClassLogical <- BreastCancer$Class == "benign"

Upvotes: 0

Related Questions