Store arrays of different size in each for loop itertaion

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Turbulence Analysis
编辑： Matt J 2024-4-11
Hi,
In the below script, I need to store the output kkkk into a new array but in the same column. Here, size of the kkkk is different during each itertaion.
I know that cell array would solve the issue. But I need to store them in the single colum.
for i=1:4
kkkk = find(A>=sz(i,1) & A<=sz(i,1)+100);
clear kkkk
end

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采纳的回答

Matt J
Matt J 2024-4-10
kkk=cell(4,1);
for i=1:4
kkkk{i} = find(A>=sz(i,1) & A<=sz(i,1)+100);
end
kkkk=vertcat(kkkk{:});
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Turbulence Analysis
Turbulence Analysis 2024-4-11
Hi Stephen,
I corrected the varibale name and preallocated the cell array correctly. Still the processing time is very large.
Matt J
Matt J 2024-4-11
I corrected the varibale name and preallocated the cell array correctly. Still the processing time is very large.
If you profile the code, I think you will see that the bottleneck is coming from find(), not from anything else. It's an expensive function.

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更多回答（1 个）

Matt J
Matt J 2024-4-11
编辑：Matt J 2024-4-11
b=sparse(sz(:,1)');
kkkk = nonzeros( (A(:)>=b & A(:)<=b+100).*(1:numel(A))' );
  1 个评论
Turbulence Analysis
Turbulence Analysis 2024-4-11
编辑：Matt J 2024-4-11
Hi,
This command leading to out of memory issue.
The arrays A and sz can be find here https://drive.google.com/file/d/1sGwoTBu3WVqOXCPIAyh0lNskyT8joCZS/view?usp=drive_link
Requested 179528104x9700 (13288.7GB) array exceeds maximum array size
preference (15.4GB). This might cause MATLAB to become unresponsive.

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