Exercise 7: R string processing
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Find a function FUN that leads to the following output:
FUN("mile")
## [1] "e" "i" "l" "m"
FUN("lime")
## [1] "e" "i" "l" "m"
FUN("camel")
## [1] "a" "c" "e" "l" "m"
FUN(paste(sample(letters), collapse = ""))
## [1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m"
## [14] "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"
Hint: aim to keep the answer simple. The main logic of the function can often be summarized in a single line of R code.
Answer: click to reveal
We can write the function as follows:
FUN <- function(x) {
return(sort(strsplit(x, split = "")[[1]]))
}
This function splits the input string into single characters and then performs an alphabetical sort. For example:
x <- "camel" strsplit(x, split = "") ## [[1]] ## [1] "c" "a" "m" "e" "l" sort(strsplit(x, split = "")[[1]]) ## [1] "a" "c" "e" "l" "m"
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