Find the union of two collections of objects

union(x, y, ...)

# S3 method for default
union(x, y, ...)

# S3 method for neuronlist
union(x, y, ...)

Arguments

x	the first collection to consider.
y	the second collection to consider.
...	additional arguments passed to methods

A collection of the same mode as x that contains all unique elements of x and y.

Note that union.default calls base::union to ensure consistent behaviour for regular vectors.