Create integer identifiers for a COM(P)ADRE database corresponding to unique combinations of a given set of columns

Creates a vector of integer identifiers corresponding to the rows of a CompadreDB object, based on unique combinations of the elements in a given set of columns.

cdb_id(cdb, columns)

Arguments

cdb

A CompadreDB object
columns

Vector of column names from which unique combinations should be identified

Value

Vector of integer identifiers corresponding to the rows of cdb, based on unique combinations of the elements in columns.

Details

Identifiers are assigned by pasting together the relevant columns, assigning factor levels based on alphabetical order, and then converting the factor levels to integers.

Examples

cdb_id(Compadre, columns = c("SpeciesAuthor", "MatrixTreatment"))
#>   [1] 108  71   3  53  48 100 111  57  20  98  93  17  69 113  18  96  62  92
#>  [19]  35 119  85  49  88 107  90  23  76  89 115  58   6 118  39  37  25  66
#>  [37]  50  98  11 102 101  77  68 106   5  21  55 121  57  95  26  67  34 109
#>  [55]  65 122  73  37  11  72   4   8  22 114   1  44  14 120 123  31  28   9
#>  [73]  99  74  79  33  84  37  72 103 105  57  42  52  26 116  13  60  63  12
#>  [91]  16  94  43  78  19  14  86   8  13  81  73  47  64  97  91  15 117   7
#> [109] 112  79  75 110  78  82  25  32  61 107 120  42  17  57 118  64   2  80
#> [127]  36  83  38 102  56  40  58  46  29  27  41 104  51 100  87  15  59  70
#> [145]  30  10  54  15  24  45