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How can I figure out which element in the array is repeated and how many times?

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Võ Kiet 2021-8-18

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评论： Võ Kiet 2021-8-22

采纳的回答： Wan Ji

Hi every one, I have a problem with matrix.

Code:

A = {''A'', "B", ''C''; "D", "E", "F"; ''A'', "G", "H"; ''C'', "Y", "C"};

How can I figure out which element in the array is repeated and how many times?

Thanks and Best Regards,

Kiet Vo

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Wan Ji 2021-8-18

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Hi, friend, using histcounts, things will be simple

A = {'A', 'B', 'C'; 'D', 'E', 'F'; 'A', 'G', 'H'; 'C', 'Y', 'C'};
A = categorical (A);
[counts, val] = histcounts(A)

Results become

counts =
     2     1     3     1     1     1     1     1     1
val =
  1×9 cell 数组
    {'A'}    {'B'}    {'C'}    {'D'}    {'E'}    {'F'}    {'G'}    {'H'}    {'Y'}

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Wan Ji 2021-8-21

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That's Simple to solve

function [x, characters, counts]= another_function(A)
A = categorical (A);
[counts, val] = histcounts(A);
q = counts>=2;
counts = counts(q);
characters = val(q);
x = 2*counts;
end

Võ Kiet 2021-8-22

Yaaaa, I got it. Thanks so much for your support =v=

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