Converting data contained in a cell array into a 4D matrix for input into a CNN for feature extraction

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CHRISTOPHER MILLAR 2021-6-8

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https://ww2.mathworks.cn/matlabcentral/answers/850660-converting-data-contained-in-a-cell-array-into-a-4d-matrix-for-input-into-a-cnn-for-feature-extracti

评论： CHRISTOPHER MILLAR 2021-6-8

采纳的回答： KSSV

Hi All,

I am working with EMG data and trying to use a CNN to extract features from the raw signal

I currently have the latest version of Matlab 2021a

XTrain (453x1 cell array) each cell conatins a sample signal (8*213) so to clairfy that is 453 samples and each sample contains 8 channel sequence with 213 data points

From the reading i have done this needs to be converted in to a 4D matrix to be acceptable for a CNN

I thought his would work based on an example set of code i found:

XTrain = reshape(XTrain,[8,213,1,453])

but i am getting errors:

Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that

dimension.

I am not really sure how to make this work now. I have tried using empty [] in place of some of the dimensions but this has not worked either.

Any help would be appreciated

Kind Regards

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Answer 1

KSSV 2021-6-8

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https://ww2.mathworks.cn/matlabcentral/answers/850660-converting-data-contained-in-a-cell-array-into-a-4d-matrix-for-input-into-a-cnn-for-feature-extracti#answer_719615

在 MATLAB Online 中打开

XTrain = cat(3,XTrain{:}) ;
XTrain = reshape(XTrain,8,213,1,453) ;

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KSSV 2021-6-8

在 MATLAB Online 中打开

% Demo with dummy data 
XTrain = cell(453,1) ; 
for i = 1:453
    XTrain{i} = rand(8,213) ; 
end
XTrain = cat(3,XTrain{:}) ;
XTrain = reshape(XTrain,8,213,1,453) ;