uniquify

Version 1.0.0.0 (1.76 KB) by Yair Altman
Ensures a given set of values is unique (adds a very small number to duplicate values)
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Updated 28 Aug 2007

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Some Matlab functions (e.g., interpolation) require their inputs to be a unique set of values. UNIQUIFY ensures that a given data vector is unique by adding very small numbers to duplicate entries in the input.

UNIQUIFY does NOT sort the values, contrary to Matlab's unique() function - it just slightly modifies any duplicate values. The data remains in its original order.

Example:
vals = uniquify([1,1,1]) -1; => [0, 2.22e-16, 4.44e-16]

Algorithm:
loop over all duplicate entries, adding eps*2^iter in each iteration until the entire data vector is unique.

See also:
unique, interp1, consolidate (on the File Exchange)

Cite As

Yair Altman (2024). uniquify (https://www.mathworks.com/matlabcentral/fileexchange/16098-uniquify), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R12
Compatible with any release
Platform Compatibility
Windows macOS Linux
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Version Published Release Notes
1.0.0.0

Improved performance & accuracy; fixed runaway exponential deltas; fixed single/double support; added comments