cell2mat -> operation -> mat2cell : How...?

Question

William Thielicke 2021-8-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1437069-cell2mat-operation-mat2cell-how

评论： William Thielicke 2021-8-19

Hi, I have a cell aray that I need to convert to a 3D matrix, perform some operation, and then convert it back to the original cell format. I am failing to do te last step:

for i=1:301 % generate the cell array example dataset
    u{1,i}=rand(41,50);
end 
u_3d=reshape(cell2mat(u),size(u{1},1),size(u{1},2),size(u,2)); %convert cell array to 3D matrix
u_3d=medfilt3(u_3d); %perform an operation
u_3d=reshape(u_3d, size(u{1},1) , size(u{1},2)*size(u,2)); %reshape
% ... and convert back to cell array in original format... I don't get what
% numbers I have to enter...
bla=mat2cell(u_3d,[41 50],301); %Error

Thanks for your help!

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Answer 1

Adam Danz 2021-8-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1437069-cell2mat-operation-mat2cell-how#answer_770704

编辑：Adam Danz 2021-8-19

for i=1:301 % generate the cell array example dataset
    u{1,i}=rand(41,50);
end 
u_3d = cat(3,u{:});
u_3dFilt = medfilt3(u_3d); %perform an operation
u_cell = squeeze(num2cell(u_3dFilt, [1,2]))'; 

Confirm output

% check that it's a 1x301 cell
whos('u_cell') 
  Name        Size               Bytes  Class    Attributes

  u_cell      1x301            4967704  cell               
% Spot-check that cell n matches u_3dFilt(:,:,n)
isequal(u_cell{10}, u_3dFilt(:,:,10))
ans = logical
   1