Is it possible to create a variable like list of numbers from other matrix?

Question

Kiryl Zhaliazka 2022-3-8

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回答： the cyclist 2022-3-8

For example, I have random matrix 10*10, and I want to create array of numbers that my matrix has, and if some of numbers repeat at matrix several times, show this numbers in my "list" ones.

Thank you!

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Answer 1

Cris LaPierre 2022-3-8

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Use the unique function.

a = [1 2 3 3 3];
b = unique(a)
b = 1×3
     1     2     3

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Answer 2

the cyclist 2022-3-8

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Is this what you mean? I'll illustrate with a smaller matrix.

M = [ 2  2;
      3  5;
      7  7;
      9 11;
     13 13];
[numberOfOccurrences, uniqueValues] = histcounts(M(:)',[unique(M(:))' Inf])
numberOfOccurrences = 1×7
     2     1     1     2     1     1     2
uniqueValues = 1×8
     2     3     5     7     9    11    13   Inf