Count number of smaller than the threshold in the certain rows of cell arrays

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BN 2020-12-17

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https://ww2.mathworks.cn/matlabcentral/answers/696785-count-number-of-smaller-than-the-threshold-in-the-certain-rows-of-cell-arrays

评论： BN 2020-12-18

C.mat

Dear all,

I have a 1 x 3 cell array, each 3 array includes 360x1 double. For each 1 to 360 rows stored in every 3 arrays, I want to know how many times I have smaller than -0.5 values. For example, I want to consider all first rows in each array and count that there is any smaller than -0.5 exist in them. Then consider all second rows in each array, and so on. I don't want to look at each array individually but I need to consider every row in all arrays as integrated rows.

So input is 1 x 3 cell array. And the output is: 3 x 1 double (number of times each row has smaller than -0.5 values)

Any advice is really helpful

Thank you.

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Answer 1

Matt J 2020-12-17

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https://ww2.mathworks.cn/matlabcentral/answers/696785-count-number-of-smaller-than-the-threshold-in-the-certain-rows-of-cell-arrays#answer_578635

编辑：Matt J 2020-12-17

sum(cell2mat(CELL)<-0.5,1).'

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Matt J 2020-12-18

编辑：Matt J 2020-12-18

What you described cannot lead to a 3x1 double vector, which is what you said you expected the output to be. However, the modification you're talking about is simply,

sum(cell2mat(CELL)<-0.5,2)

Generally, speaking there doesn't seem to be any reason for you to be holding your data as a cell array. You should just make it into a 360x3 double matrix,

C=cell2mat(CELL);

BN 2020-12-18