map_at() usage in the Chapter 8.3.1

[leynu]

Hi,

According to the book:

map_at(numbers, c(1, 3), sqrt)

will generate the following output.

## [[1]]
## [1] 2.645751
## 
## [[2]]
## [1] 8
## 
## [[3]]
## [1] 4.358899
## 
## [[4]]
## [1] 64

However, the numbers vector takes values numbers <- c(0, 5, 8, 3, 2, 1)
and the output I get is:

## [[1]]
## [1] 0
## 
## [[2]]
## [1] 5
## 
## [[3]]
## [1] 2.828427
## 
## [[4]]
## [1] 3
## 
## [[5]]
## [1] 2
## 
## [[6]]
## [1] 1

This does make sense since the square root of 0 is 0 and the square root of 8 is 2.828427.

Looking forward to your response.
Thanks,
Leyla