i2index is a simple helper function to be used in subsetting functions. It
checks and converts the parameter i, which can be of type integer,
logical or character to integer vector that can be used as index for
subsetting.
Usage
i2index(i, length = length(i), names = NULL)
Arguments
- i
character logical or integer used in [i] for subsetting.
- length
integer representing the length of the object to be
subsetted.
- names
character with the names (rownames or similar) of the object.
This is only required if i is of type character.
Value
integer with the indices
Examples
## With `i` being an `integer`
i2index(c(4, 1, 3), length = 10)
#> [1] 4 1 3
## With `i` being a `logical`
i2index(c(TRUE, FALSE, FALSE, TRUE, FALSE), length = 5)
#> [1] 1 4
## With `i` being a `character`
i2index(c("b", "a", "d"), length = 5, names = c("a", "b", "c", "d", "e"))
#> [1] 2 1 4
