PADCAT on cells with nested cells

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jenifer Ask 2019-12-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/498284-padcat-on-cells-with-nested-cells

编辑： jenifer Ask 2019-12-30

rotate.mat

try to use Padcat function on my cells, but I can't, because my cells include nested cells, Attached my fils (6*47). (6 is number my images).

how to change this code to access the correct result (matrix with size 6*n)?

padcat can be downloaded from the File Exchange: https://uk.mathworks.com/matlabcentral/fileexchange/22909-padcat-varargin-

load ('rotate.mat')
a_2=rotatedImage;
for i=1:6
    [m{i}, tf{i}] = padcat(a_2(i,:))'; % concatenate, pad rows with NaNs
    m{i}(~tf{i}) = 0 % replace N
    
    vec_rotate{i}= cell2mat(a_2(i,:))' ;  
    vec_rotate{i}=vec_rotate(i,:)'
end

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Stephen23 2019-12-28

编辑：Stephen23 2019-12-28

在 MATLAB Online 中打开

rotate.mat

"try to use Padcat function on my cells, but I can't, because my cells include nested cells..."

Your uploaded data does not contain any nested cell arrays, the cell array contains either empty numeric arrays or 5x5 logical arrays:

>> load('rotate.mat')
>> fun = @(a)(isnumeric(a)&&isempty(a))||(islogical(a)&&all(size(a)==[5,5]));
>> all(cellfun(fun,rotatedImage(:)))
ans =
     1

You call padcat with only one input argument, which (if it worked) would concatenate that one input with ... nothing. If you want to use padcat you should read its documentation: it clearly states that each vector needs to be provided as one input argument. Which would also tell you that you cannot use padcat: it is defined for vectors only, not 5x5 matrices like you have:

>> padcat(true(5,5),false(5,5))
Error using padcat (line 92)
Inputs should be all row vectors or all column vectors.

"how to change this code to access the correct result (matrix with size 6*n)? "

Your cell array contains logical/numeric arrays with sizes 0x0 or 5x5: how do you want to concatenate those arrays in such as way to get one single 6xN array?

Stephen23 2019-12-29

编辑：Stephen23 2019-12-29

在 MATLAB Online 中打开

gmag.mat

As far as I can tell, you are trying to do something like this:

C = cellfun(@(a)a(:).',Gmag,'uni',0); % all matrices -> row vectors
C(cellfun(@isempty,C)) = {zeros(1,9)}; % replace empty arrays with zeros
M = cell2mat(C); % convert to 6x423 numeric matrix