<< sum

Data analysis

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unique

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Unique values.

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Syntax

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C = unique(A)

C = unique(A, 'rows')

[C, ia, ic] = unique(...)

Input argument

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A

an nelson's variable (double, single, int8, int16, int32, int64, uint8, uint16, uint32, uint64, logical, char, string, cell).

Output argument

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C

Unique data of A.

ia

Index to A: column vector.

ic

Index to C: column vector.

Description

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C = unique(A) returns the unique elements of array A in sorted order.

C = unique(A, 'rows') considers each row of A as a unique entity and returns the unique rows in sorted order.

Note that the 'rows' option does not support cell arrays.

[C, ia, ic] = unique(...) extends any of the previous syntaxes to also return index vectors ia and ic.

For a vector A, the relationships are C = A(ia) and A = C(ic).

For a matrix or array A, the relationships are C = A(ia) and A(:) = C(ic).

If the 'rows' option is used, the relationships are C = A(ia, :) and A = C(ic, :).

Used function(s)

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std::sort, std::unique (stl)

Examples

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A = [10+20i 30+i 10i 0 -10i];
[C, ia, ic] = unique(A)

A = {'hi', 'good'; 'good', 'tell'; 'hi', 'bye'}
[C, ia, ic] = unique(A)

See also

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sort.

History

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Version	Description
1.6.0	initial version

Author

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Allan CORNET