groupsfrom
Groupsfrom is a term used to describe the operation of forming groups from a collection of items based on a specified grouping criterion. It is used across mathematics, statistics, and data processing to organize elements into manageable subsets.
Formally, let X be a set and f: X -> A be a grouping function that assigns to
Distinctions: when each element receives exactly one label, the groups are disjoint and cover X; with multi-valued
Examples: grouping customers by country, items by category, or documents by topic tag. In programming and databases,
Relation to other concepts: closely related to partition, equivalence relation, and clustering; grouping differs from clustering
See also: partition, equivalence relation, grouping, clustering, group by (computing).