hadley / adv-r

adv-r/Functionals.Rmd

Line 971 in 714f95f

df <- data.frame(x = 1:3, y = c("a", "b", "c"))

adv-r/Functionals.Rmd

Line 972 in 714f95f

detect(df, is.factor)

adv-r/Functionals.Rmd

Line 973 in 714f95f

detect_index(df, is.factor)

It seems like Adv-R was last re-knitted with R 4.0 because these no longer return an answer that makes sense in the context.

L#971 needs to be updated to have stringsAsFactors = TRUE
df <- data.frame(x = 1:3, y = c("a", "b", "c"), stringsAsFactors = TRUE)

Something similar happens in the first example of section 3.6.1.
The text says that data.frame() converts character vector to factor, but this doesn't happens in the chunk code, probably because now, as @yogat3ch points out, Advance R is knitted with R 4.0

There is also mention of this in section 3.4.1:

In base R you tend to encounter factors very frequently because many base R functions (like read.csv() and data.frame()) automatically convert character vectors to factors.

There are also a few instances of setting the argument to FALSE when that is now the default (in addition to those already listed):

This issue is also raised by #1770 and #1636.

Since Adv-R is now knitted with R 4.0, example results in 9.6.1 are no longer giving expected output. Fix: need stringsAsFactors = TRUE