How to use unique in an mxn matrix without sorting the columns?

3 vues (au cours des 30 derniers jours)
Katia Anatska
Katia Anatska le 9 Sep 2021
Modifié(e) : Matt J le 9 Sep 2021
For my project I have to account for any duplicate columns and remove them, but the original order of the columns must be retained. If I use the method below, the columns in the output get sorted. Is there a way to remove the duplicate columns in a matrix without sorting them?
I have a 2 by 4 matrix A:
A = [7, 2, 1, 9; 3, 2, 9, 11]
a_transpose = A.'
a_no_duplicate = unique(a_transpose, 'rows').'
After running the code, this is the output:
a_no_duplicate =
1 2 7 9
9 2 3 11
(Here the columns are sorted)

Réponse acceptée

Matt J
Matt J le 9 Sep 2021
Modifié(e) : Matt J le 9 Sep 2021
A = [7, 2, 1, 1; 3, 2, 9, 9]
A = 2×4
7 2 1 1 3 2 9 9
a_no_duplicate = unique(A.', 'rows').'
a_no_duplicate = 2×3
1 2 7 9 2 3
a_no_duplicate_no_sort = unique(A.', 'rows','stable').'
a_no_duplicate = 2×3
7 2 1 3 2 9

Plus de réponses (0)

Catégories

En savoir plus sur Shifting and Sorting Matrices dans Help Center et File Exchange

Produits


Version

R2021a

Community Treasure Hunt

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

Start Hunting!

Translated by