Number of counts in matrix

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Prince
Prince 2024-4-3
评论： Voss 2024-4-3
How to count the number of individual elements in a matrix using matlab? I mean the number of times individual elements appear.

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Voss
Voss 2024-4-3
Ran in:
You can use nnz.
Example:
A = [1 1 2; 2 1 2; 3 1 1]
A = 3x3
1 1 2 2 1 2 3 1 1
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nnz(A == 1) % number of times 1 appears in A
ans = 5
nnz(A == 2) % number of times 2 appears in A
ans = 3
nnz(A == 3) % number of times 3 appears in A
ans = 1
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Prince
Prince 2024-4-3
It worked. Thank you so much
Voss
Voss 2024-4-3
Great! You're welcome!

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更多回答（1 个）

Steven Lord
Steven Lord 2024-4-3
Use histcounts with unique (or uniquetol) to generate the bins. You will need to add one more bin at the end since the last bin includes both its edges (unlike the other bins, which only include their left edges.) I would use inf as the right-most end of that last bin.

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