Problem 42671. unique with nan

Created by Mehmet OZC

Difficulty:Rate

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input

 x = [2 NaN 3 5 NaN;
      1 NaN 4 9 NaN;
      8 -2  7 6  -2;
      7  4  8 5  4];

output

 y_correct = 
 [2 NaN 3 5;
  1 NaN 4 9;
  8 -2  7 6;
  7  4  8 5];

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Last Solution submitted on Oct 24, 2023

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Peng Liu on 26 Oct 2015

The objective of the problem is to find unique columns in the matrix, performing like unique(A,'columns','stable'), but treating NaN as equal numbers.

Mehmet OZC on 27 Oct 2015

The explanation of Peng is correct. I inspired from the function of "isequalwithequalnans". You cannot use to test the equality of two arrays which contain nan values with the function of "isequal". The purpose is to write a function something like "uniquewithequalnans"

Guillaume on 27 Oct 2015

As standard unique does not operate on columns I didn't even realise that the example had two identical columns. I saw the problem as just remove the unique elements in each row which could potentially result in rows of different length. Hence my initial question.

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Problem 42671. unique with nan

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Last 200 Solutions

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Problem 42671. unique with nan

Solution Stats

Last 200 Solutions

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Solution Comments

Problem Recent Solvers36

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