Perform Count for Vector of IDs.

The return value is a two-column integer matrix. Column one represents the unique ids of the input vector, column two the respective number of occurrences / counts.

ids_to_count_matrix(ids)

Arguments

ids

a vector of ids (integer values)

Examples

ids <- c(1L, 5L, 5L, 7L, 7L, 7L, 7L)
ids_to_count_matrix(ids)
#>      [,1] [,2]
#> [1,]    1    1
#> [2,]    5    2
#> [3,]    7    4
table(ids) # alternative to get a similar result
#> ids
#> 1 5 7 
#> 1 2 4