GNU Octave Manual Version 3 by John W. Eaton, David Bateman, Søren Hauberg Paperback (6"x9"), 568 pages ISBN 095461206X RRP £24.95 ($39.95) Get a printed copy>>>

GNU Octave Manual Version 3 Buy the book here >>> support free software

25 Sets

Octave has a limited number of functions for managing sets of data, where a set is defined as a collection of unique elements. In Octave a set is represented as a vector of numbers.

Function File: create_set (x)

Return a row vector containing the unique values in x, sorted in ascending order. For example,

create_set ([ 1, 2; 3, 4; 4, 2 ])
=> [ 1, 2, 3, 4 ]

See also union, intersection, complement

Function File: unique (x)

Return the unique elements of x, sorted in ascending order. If x is a row vector, return a row vector, but if x is a column vector or a matrix return a column vector.

Function File: unique (A, 'rows')

Return the unique rows of A, sorted in ascending order.

Function File: [y, i, j] = unique (x)

Return index vectors i and j such that x(i)==y and y(j)==x.

See also union, intersect, setdiff, setxor, ismember