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)
#> $cat
#> [1] 120
#> 
#> $dog
#> [1] 120
#> 
#> $heart
#> [1] 120
#> 
#> $leaf2
#> [1] 120
#> 

# Use in measure()
bot %>% measure("coords_nb")
#> # A tibble: 40 × 4
#>    coo       type   dummy coo_coords_nb
#>    <out>     <fct>  <fct>         <dbl>
#>  1 (138 x 2) whisky a               138
#>  2 (168 x 2) whisky a               168
#>  3 (189 x 2) whisky a               189
#>  4 (129 x 2) whisky a               129
#>  5 (152 x 2) whisky a               152
#>  6 (161 x 2) whisky a               161
#>  7 (124 x 2) whisky a               124
#>  8 (126 x 2) whisky a               126
#>  9 (183 x 2) whisky a               183
#> 10 (193 x 2) whisky a               193
#> # ℹ 30 more rows