Useful sequences

vec_seq_along() is equivalent to seq_along() but uses size, not length. vec_init_along() creates a vector of missing values with size matching an existing object.

vec_seq_along(x)

vec_init_along(x, y = x)

Arguments

x, y

Vectors

Value

• vec_seq_along() an integer vector with the same size as x.

• vec_init_along() a vector with the same type as x and the same size as y.

Examples

vec_seq_along(mtcars)
#>  [1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
#> [26] 26 27 28 29 30 31 32
vec_init_along(head(mtcars))
#>      mpg cyl disp hp drat wt qsec vs am gear carb
#> ...1  NA  NA   NA NA   NA NA   NA NA NA   NA   NA
#> ...2  NA  NA   NA NA   NA NA   NA NA NA   NA   NA
#> ...3  NA  NA   NA NA   NA NA   NA NA NA   NA   NA
#> ...4  NA  NA   NA NA   NA NA   NA NA NA   NA   NA
#> ...5  NA  NA   NA NA   NA NA   NA NA NA   NA   NA
#> ...6  NA  NA   NA NA   NA NA   NA NA NA   NA   NA