Finding arrays above threshold value

Question

Manny Kins 2019-4-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/456683-finding-arrays-above-threshold-value

评论： Manny Kins 2019-4-17

采纳的回答： Stephen23

I have a struct AT.AX

AX has the following values:

1x370 double

1x1007 double

1x3957 double

1x6309 double

1x1648 double

1x2032 double

1x1173 double

1x16837 double

1x15977 double

1x267 double

Is there a way to find all the elements with length greater than 2000 and assign them to a new variable?

Thanks

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Stephen23 2019-4-16

"I have a struct AT.AX"

"Is there a way to find all the cells ..."

Structure arrays do not have cells (but they do have elements).

Please clarify if you have a structure array or a cell array.

Manny Kins 2019-4-17

Hi, I used the word cell quite carelessly, I had a structure array with elements. I have edited my question so it becomes a bit clearer to anyone else reading. Thanks again for your help.

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Answer 1

Stephen23 2019-4-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/456683-finding-arrays-above-threshold-value#answer_370864

Fake data:

AT(1).AX = rand(1,370);
AT(2).AX = rand(1,1007);
AT(3).AX = rand(1,3957);
AT(4).AX = rand(1,6309);
AT(5).AX = rand(1,1648);
AT(6).AX = rand(1,2032);
AT(7).AX = rand(1,1173);
AT(8).AX = rand(1,16837);
AT(9).AX = rand(1,15977);
AT(10).AX = rand(1,267);

And then simply:

L = cellfun('length',{AT.AX});
Z = AT(L>2000)

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Manny Kins 2019-4-16

Thank you for your help, KSSV also came up with a similar solution but this one is more directly applicable to my setup.

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Answer 2

KSSV 2019-4-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/456683-finding-arrays-above-threshold-value#answer_370862

% Make some random data for demo 
A = cell(10,1) ;
for i = 1:10
    N = randperm(1000,1) ; 
    A{i} = rand(N,1) ; 
end
% Pick cells whose length greater than 500 
L = cellfun(@length,A) ;
B = A(L>500)