union

Arguments

a

vector or matrix of numbers or strings

b

vector of real numbers or strings

orient

flag with possible values : 1 or "r", 2 or "c".

v

row vector or matrix of numbers or strings

ka

row vector of integers

kb

row vector of integers

Description

union(a,b) returns a sorted row vector which retains the unique entries of [a(:);b(:)].

union(a,b,"r") or union(a,b,1)returns the matrix formed by the union of the unique rows of a and b sorted in lexicographic ascending order. In this case matrices a and b must have the same number of columns.

union(a,b,"c") or union(a,b,2)returns the matrix formed by the union of the unique columns of a and b sorted in lexicographic ascending order. In this case matrices a and b must have the same number of rows.

[v,ka,kb]=union(a,b) also returns index vectors ka and kb such that v is a sorted combination of the entries a(ka) and b(kb).

Examples

A=round(5*rand(10,1));
B=round(5*rand(7,1));

union(A,B)
[N,ka,kb]=union(A,B)

union('a'+string(A),'b'+string(B))

See also

• unique — extracts (and sorts) distinct elements, rows or columns of a matrix
• gsort — sorting by quick sort algorithm