finding unique cell elements from different size of matrix

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Research
Research 2018-10-16
评论： Research 2018-10-16
Hello friends, I have a cell array, but each cell has a different length. For example, a={[1,2] [1,4,2,5] [1,3,4,5,2] [0,5,6] [7,2,4,5] [1,4,2,5,6,8,9]}. Two questions. I want to find elements that are most often repeated in each cell. In this example, the answer is '2'. Note that '2' is not present in cell number 5. The second question, I want to know is how many times answer '2' is repeated. Previous examples deal with uniform cell sizes using the unique function. In this example cell sizes are not constant. Any help, thanks in advance. -DaveG

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回答（1 个）

Stephen23
Stephen23 2018-10-16
编辑：Stephen23 2018-10-16
Your question has nothing to do with unique. The element that occurs the most often in a set of data is called the mode, and it can be obtained using the MATLAB function mode:
>> a = {[1,2],[1,4,2,5],[1,3,4,5,2],[0,5,6],[7,2,4,5],[1,4,2,5,6,8,9]};
>> v = [a{:}]; % convert to numeric vector
>> m = mode(v) % most common element
m = 2
>> n = nnz(m==v) % how many times it occurs
n = 5

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