Count occurrences of categorical conjunction

Question

Nex 2021-9-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1462264-count-occurrences-of-categorical-conjunction

回答： Chunru 2021-9-28

Given two separate categorical variables with the same length (refering to the same data):

Cat_one = categorical({'A'; 'B'; 'A'; 'D'; 'C'; 'B'; 'B'; 'A'; 'A'});
Cat_two = categorical({'X'; 'X'; 'Y'; 'Y'; 'Y'; 'X'; 'Y'; 'X'; 'X'});

How can I find the average occurences of each unique item in Cat_one within group X of Cat_two?

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Answer 1

Chunru 2021-9-28

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1462264-count-occurrences-of-categorical-conjunction#answer_796724

在 MATLAB Online 中打开

Cat_one = categorical({'A'; 'B'; 'A'; 'D'; 'C'; 'B'; 'B'; 'A'; 'A'});
Cat_two = categorical({'X'; 'X'; 'Y'; 'Y'; 'Y'; 'X'; 'Y'; 'X'; 'X'});
u1 = unique(Cat_one);
for i=1:length(u1)
    idx = Cat_one == u1(i);
    c(i) = sum(Cat_two(idx) == 'X');
end
c     % corresponding occurence of 'X';  Not sure the definition of averaging
c = 1×4
     3     2     0     0