how to find out how many times a number apears in a 2D matrix ? which function to use?
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Hey,
how can I find how many time a numbers appears in an 2D matrix for example:
If I have a matrix
x=[1,3,4;2,2,1;2,2,1]
number 2 appears 4 times
numger 1 appears 2 times
number 3 appears 1 time
Desired output:
22 1 3
22 1
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Image Analyst
2019년 1월 7일
편집: Image Analyst
2019년 1월 7일
You can't have an array with ragged right edge. Arrays must be rectangular. What do you want in the space below the 3? Or else you could have a 1-by-3 cell array, ca where
ca{1} = [2, 2; 2, 2];
ca{2} = [1;1];
ca{3} = 3;
Is that what you want?
Anyway, 1 appears 3 times, not 2 times, and what about 4? Why is 4 not in your desired output?
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madhan ravi
2019년 1월 5일
n=2; % number to be tested
nnz(ismember(x,n))
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madhan ravi
2019년 1월 7일
편집: madhan ravi
2019년 1월 7일
Try the below , a in result represent unique numbers and the corresponding histc() shows how many times they occur in the matrix:
a = unique(x);
result = [a histc(x(:),a)]
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