The cbind method to data.frame is just a wrapper for data.frame(...). So
character columns are converted to factors.
dat <- cbind(data.frame(x = 1:3), a = c("a", "b", "c"), b = c("a", "a", "c"))
str(dat)
## 'data.frame': 3 obs. of 3 variables:
## $ x: int 1 2 3
## $ a: Factor w/ 3 levels "a","b","c": 1 2 3
## $ b: Factor w/ 2 levels "a","c": 1 1 2
dat$a == dat$b
## Error in Ops.factor(dat$a, dat$b) : level sets of factors are different
as.character(dat$a) == as.character(dat$b)
## [1] TRUE FALSE TRUE
dat <- cbind(data.frame(x = 1:3), a = c("a", "b", "c"), b = c("a", "a", "c"),
stringsAsFactors = FALSE)
str(dat)
## 'data.frame': 3 obs. of 3 variables:
## $ x: int 1 2 3
## $ a: chr "a" "b" "c"
## $ b: chr "a" "a" "c"
dat$a == dat$b
## [1] TRUE FALSE TRUE
--
Noia Raindrops
noia.raindr...@gmail.com
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