get_unique_values

This function returns the unique values of an object.

Usage

get_unique_values(x, simplify = FALSE, verbose = TRUE)

Arguments

x

Vector, matrix, raster, stars, or terra object or list of previous.

simplify

If true, a vector will be returned instead of a list for 1-dimensional input

verbose

If true, warning messages are printed

Details

Fast and memory friendly Rcpp implementation to find the unique values of an object.

Examples

landscape <- terra::rast(landscapemetrics::landscape)

get_unique_values(landscape)
#> Warning: Double values will be converted to integer.
#> $layer_1
#> [1] 1 2 3
#> 

landscape_stack <- c(landscape, landscape, landscape)
get_unique_values(landscape_stack)
#> Warning: Double values will be converted to integer.
#> Warning: Double values will be converted to integer.
#> Warning: Double values will be converted to integer.
#> $layer_1
#> [1] 1 2 3
#> 
#> $layer_2
#> [1] 1 2 3
#> 
#> $layer_3
#> [1] 1 2 3
#> 

landscape_matrix <- terra::as.matrix(landscape, wide = TRUE)
get_unique_values(landscape_matrix)
#> Warning: Double values will be converted to integer.
#> $layer_1
#> [1] 1 2 3
#> 

x_vec <- c(1, 2, 1, 1, 2, 2)
get_unique_values(x_vec)
#> Warning: Double values will be converted to integer.
#> $layer_1
#> [1] 1 2
#> 

landscape_list <- list(landscape, landscape_matrix, x_vec)
get_unique_values(landscape_list)
#> Warning: Double values will be converted to integer.
#> Warning: Double values will be converted to integer.
#> Warning: Double values will be converted to integer.
#> $layer_1
#> [1] 1 2 3
#> 
#> $layer_2
#> [1] 1 2 3
#> 
#> $layer_3
#> [1] 1 2
#>