How to get rid of repeating values inside an array

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Rokki
Rokki le 19 Sep 2017
Modifié(e) : Andrei Bobrov le 21 Sep 2017
I have a matrix
a=[1 2 3 3 4 4 5];
I want to get rid of values 3 and 4 as they are repeating so that the output becomes
b=[1 2 5]

Réponse acceptée

José-Luis
José-Luis le 19 Sep 2017
Modifié(e) : José-Luis le 19 Sep 2017
b = a(sum(bsxfun(@eq,a,a'))==1)
  2 commentaires
Rokki
Rokki le 19 Sep 2017
Thank you very much
José-Luis
José-Luis le 19 Sep 2017
Modifié(e) : José-Luis le 19 Sep 2017
My pleasure.
Please keep in mind that this is inefficient for large arrays though. Just using unique() should take you where you need to go.

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Plus de réponses (1)

Andrei Bobrov
Andrei Bobrov le 19 Sep 2017
Modifié(e) : Andrei Bobrov le 21 Sep 2017
v = unique(a);
b = v(histcounts(a,[v(:);v(end)+eps]) == 1);
or
v = unique(a);
b = v(histc(a,v) == 1);
or
aa = sort(a);
t = diff(aa);
b = aa([1 t] & [t 1]);
  3 commentaires
José-Luis
José-Luis le 19 Sep 2017
histcounts() was introduced with R2014b. You don't need it though. unique() is enough. Andrei was giving you two alternatives.
Andrei Bobrov
Andrei Bobrov le 19 Sep 2017
fixed

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