Get number of coordinates

Count the number of coordinate points in a shape.

Usage

get_coords_nb(x, ..., .cols = NULL)

Arguments

x

A matrix (nx2), list of matrices, or tibble with coo columns.

...

Additional arguments (reserved for future use).

.cols

Column name(s) to process when x is a tibble. If NULL, automatically detects columns containing coo objects.

Value

• If x is a single matrix: returns an integer

• If x is a list: returns a numeric vector

• If x is a tibble: returns a numeric vector extracted from coo column

Details

Simply returns the number of rows (coordinate points) in the shape. Can be used with measure().

Examples

get_coords_nb(shapes$cat)
#> [1] 120
get_coords_nb(shapes)
#> [1] 120 120 120 120

# Use in measure()
bot %>% measure("coords_nb")
#> # A tibble: 40 × 6
#>    id           coo       type   fake  price coo_coords_nb
#>    <chr>        <out>     <fct>  <fct> <dbl>         <dbl>
#>  1 brahma       (138 x 2) whisky a       3             138
#>  2 caney        (168 x 2) whisky a       1.2           168
#>  3 chimay       (189 x 2) whisky a       3.8           189
#>  4 corona       (129 x 2) whisky a       2.6           129
#>  5 deusventrue  (152 x 2) whisky a       1.1           152
#>  6 duvel        (161 x 2) whisky a       3.1           161
#>  7 franziskaner (124 x 2) whisky a       2.6           124
#>  8 grimbergen   (126 x 2) whisky a       2.9           126
#>  9 guiness      (183 x 2) whisky a       1.2           183
#> 10 hoegardeen   (193 x 2) whisky a       3.6           193
#> # ℹ 30 more rows