When does 'interp1' function give 'The grid vector must contain unique points' error?

2016 12 29
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When does 'interp1' function give 'The grid vector must contain unique points' error?

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This error comes when there are duplicate points in input to 'interp1'.
You can remove duplicates using 'unique' function.
Example:-
>> [x, index] = unique(x);
>> yi = interp1(x, y(index), xi);

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