Extraction of struct dataset

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Sidharth Raut 2023-5-1

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评论： Sidharth Raut 2023-5-4

Hello there,

I'm trying to perfrom FLIR post-processing on IR datasets. I've generated the IR data in .mat format and imported it into MATLAB. MATLAB reads the IR file as 1x1 struct which is having 2879 fields. Now, I want to extract the number of frames on which I need to perform the post-processing but I cannot to extract the file altogether. I tried the following command:

DATA1=horzcat(DATA.Frame21);

But the problem with this is that it only extract single frame. Is there a way to extract 2879 frames altogether? I tried performing for loop but it's not working. Can you please suggest a way to extract the number of frames from struct file?

Thanks in advance.

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Stephen23 2023-5-1

https://www.mathworks.com/help/matlab/ref/struct2cell.html

Sidharth Raut 2023-5-1

Hello Stephen23,

Thanks for your suggestion. However, with struct2cell option, I'm getting 2879x1 cell dataset which still have all the consolidated datasets, i.e. number of frames, frames_datatime and objectparam. I need only to extract number of frames ( in double) to perform the post-processing. Can you suggest me how to do that?

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Answer 1

Daniel Dolan 2023-5-3

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I will assume that every frame is a 2D array of the same size. Use the first array to preallocate a 3D array, each layer of which holds one 2D array. Then loop through the each frame, generating the appropriate field name with sprintf.

N=2879;
result=repmat(DATA.Frame1,[1 1 N]);
for n=2:N
    name=sprintf('Frame%d',n);
    result(:,:,n)=DATA.(name);
end

There is lots of room for improvment here--just showing the highlights now. If the arrays are larger than 2D, this code can be tweaked to add another dimension.

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Sidharth Raut 2023-5-4

Hello Daniel,

Thanks for your suggestion, it works well.

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Answer 2

Daniel Dolan 2023-5-3

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https://ww2.mathworks.cn/matlabcentral/answers/1955824-extraction-of-struct-dataset#answer_1228059

在 MATLAB Online 中打开

I will assume that every frame is a 2D array of the same size. Use the first array to preallocate a 3D array, each layer of which holds one 2D array. Then loop through the each frame, generating the appropriate field name with sprintf.

N=2879;
result=repmat(DATA.Frame1,[1 1 N]);
for n=2:N
    name=sprintf('Frame%d',n);
    result(:,:,n)=DATA.(name);
end

There is lots of room for improvment here--just showing the highlights now. If the arrays are larger than 2D, this code can be tweaked to add another dimension.