Set Operations

Unions, intersection, set membership

Set operations compare the elements in two sets to find commonalities or differences. In MATLAB^®, the sets are arrays of numbers, dates, times, or text data. Most set operations compare sets for exact equality, which can be problematic in the context of floating-point arithmetic. For that reason, the ismembertol and uniquetol functions are also available to perform comparisons with a tolerance.

Functions

`intersect`	Set intersection of two arrays
`ismember`	Array elements that are members of set array
`setdiff`	Set difference of two arrays
`setxor`	Set exclusive OR of two arrays
`union`	Set union of two arrays
`unique`	Unique values in array
`ismembertol`	Members of set within tolerance
`uniquetol`	Unique values within tolerance
`join`	Combine two tables or timetables by rows using key variables
`innerjoin`	Inner join between two tables or timetables
`outerjoin`	Outer join between two tables or timetables

Topics

Average Similar Data Points Using a Tolerance
This example shows how to average a group of points that are within tolerance. This approach produces a reduced data set that still holds the general shape of the original data.
Group Scattered Data Using a Tolerance
This example shows how to group scattered data points based on their proximity to points of interest.