BUILT-IN MATHEMATICA SYMBOL

ArrayComponents

ArrayComponents[array]
gives an array in which all identical elements of array are replaced by an integer index representing the component in which the element lies.

ArrayComponents[array, level]
finds the identical elements at the specified level in array

ArrayComponents[array, level, rules]
uses a rule or a list of rules for specifying the labels.

Details Details

ArrayComponents returns a label matrix where identical elements are represented by consecutive non-negative integers.
Occurrences of zeros or None in array are always labeled with zeros.
ArrayComponents can be used to canonicalize label matrices.