Reading uneven datasets from .mat file

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Sidharth Raut 2023-5-11

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https://ww2.mathworks.cn/matlabcentral/answers/1961449-reading-uneven-datasets-from-mat-file

评论： Stephen23 2023-5-11

Hello all,

I'm trying to load datasets from .mat file in MATLAB. However, my datasets are not evenly distributed due to which I cannot import my entire dataset into MATLAB. My datasets are spilt in the intervals of 20 and 21. Is there a way to import the entire datasets at once into MATLAB?Please provide some suggestions to resolve this issue.

Thanks in advance!

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Sidharth Raut 2023-5-11

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Hello Chris,

I'm dealing with heavy file (3GB) and I can't attach it. But, I'm sharing the code that I'm using to read and write the datasets.

Data = load('testcase.mat');
N = 21:21:30215;
Tdata = repmat(Data.Frame21, [1 1 length(N)]);
for n = 1:length(N)
    name = sprintf('Frame%d', N(n));
    Tdata(:,:,n) = Data.(name);
end

The issue is that my datasets are not evenly distributed and after reading some sets (initially), MATLAB generates error stating frames cannot be found.

Stephen23 2023-5-11

编辑：Stephen23 2023-5-11

Rather than generating the fieldnames youself (including non-existent ones), why not just loop over the existing fieldnames?:

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

If the aim is simply to extract to a numeric matrix, you could use STRUCT2CELL and then CAT(3,..).

Or STRUCTFUN with a function that returns a scalar cell, then again CAT(3,...).

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Answer 1

Stephen23 2023-5-11

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https://ww2.mathworks.cn/matlabcentral/answers/1961449-reading-uneven-datasets-from-mat-file#answer_1233009

编辑：Stephen23 2023-5-11

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Assuming that:

the fields are in the required order (otherwise: you can sort them using ORDERFIELDS).
the MAT file contains only the data that you require (otherwise: you can specify the variables to import).

S = load('testcase.mat');
C = structfun(@(m){m},S);
A = cat(3,C{:})

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Sidharth Raut 2023-5-11

Hello Stephen But can I load all frames at once? I only need frames (frame21 to frame 30215), will it be possible to import everything at once?

Stephen23 2023-5-11

"But can I load all frames at once? I only need frames (frame21 to frame 30215), will it be possible to import everything at once?"

The LOAD command i gave you in my last comment will import every variable whose name is "Frame" followed by some digits. That seems to match exactly what you describe. Did you try it? Did it not work for you?

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