Problem 42671. unique with nan

Created by Mehmet OZC
Appears in Cody Problems in Japanese

Difficulty:Rate

Solve Later
Add To GroupÃ‚

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];

Solve

Solution Stats

84 Solutions
36 Solvers

Last Solution submitted on Oct 24, 2023

Last 200 Solutions

Problem Comments

6 Comments

6 Comments

Show 3 older comments

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.

Solution Comments

Show comments

Problem Recent Solvers36

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 42671. unique with nan

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers36

Suggested Problems

More from this Author92

Problem Tags

Community Treasure Hunt

Problem 42671. unique with nan

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers36

Suggested Problems

More from this Author92

Problem Tags

Community Treasure Hunt

Players