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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:
**unique***(*`x`) - Function File:
**unique***(*`x`, "rows") - Function File:
**unique***(…, "first")* - Function File:
**unique***(…, "last")* - Function File:
*[*`y`,`i`,`j`] =**unique***(…)* Return the unique elements of

`x`, sorted in ascending order. If the input`x`is a vector then the output is also a vector with the same orientation (row or column) as the input. For a matrix input the output is always a column vector.`x`may also be a cell array of strings.If the optional argument

`"rows"`

is supplied, return the unique rows of`x`, sorted in ascending order.If requested, return index vectors

`i`and`j`such that`x(i)==y`

and`y(j)==x`

.Additionally, if

`i`is a requested output then one of`"first"`

or`"last"`

may be given as an input. If`"last"`

is specified, return the highest possible indices in`i`, otherwise, if`"first"`

is specified, return the lowest. The default is`"last"`

.

• Set Operations: |