String subsetting operators.
The x %sget% ss
operator
gets a certain number of the first and last characters of every string in
character vector x
. %s><%
is an alias for %sget%
.
The x %strim% ss
operator
trims a certain number of the first and last characters of every string in
character vector x
. %s<>%
is an alias for %strim%
.
Arguments
- x
a character vector.
- ss
a vector of length 2, or a matrix with 2 columns with
nrow(ss) == length(x)
. The objectss
should consist entirely of non-negative and non-missing integers, or be coerce-able to such integers. (thus negative integers, and missing values are not allowed; decimal numbers will be converted to integers).
The first element/column ofss
gives the number of characters counting from the left side to be extracted/removed fromx
.
The second element/column ofss
gives the number of characters counting from the right side to be extracted/removed fromx
.
Value
The x %sget% ss
operator
gives a certain number of the first and last characters of
character vector x
.
The x %strim% ss
operator
removes a certain number of the first and last characters of
character vector x
.
Examples
x <- c(paste0(letters[1:13], collapse = ""),
paste0(letters[14:26], collapse = ""))
print(x)
#> [1] "abcdefghijklm" "nopqrstuvwxyz"
ss <- c(2, 3)
x %sget% ss
#> [1] "abklm" "noxyz"
x <- c(paste0(letters[1:13], collapse = ""),
paste0(letters[14:26], collapse = ""))
print(x)
#> [1] "abcdefghijklm" "nopqrstuvwxyz"
ss <- c(1, 0)
x %sget% ss
#> [1] "a" "n"
x <- c(paste0(letters[1:13], collapse = ""),
paste0(letters[14:26], collapse = ""))
print(x)
#> [1] "abcdefghijklm" "nopqrstuvwxyz"
ss <- c(2, 3)
x %strim% ss
#> [1] "cdefghij" "pqrstuvw"
x <- c(paste0(letters[1:13], collapse = ""),
paste0(letters[14:26], collapse = ""))
print(x)
#> [1] "abcdefghijklm" "nopqrstuvwxyz"
ss <- c(1, 0)
x %strim% ss
#> [1] "bcdefghijklm" "opqrstuvwxyz"