Remove zero entries from cell arrays

Question

Harold 2012-4-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/36313-remove-zero-entries-from-cell-arrays

Suppose I have a m x n cell array. Some of these cells contain a 1 x 2 matrix of values other cells contain just a zero. I want to be able to delete all cells that contain zeros and have the cell array automatically re-size when finished. If you copy and past this in the command window you can see what I'm trying to accomplish. I've tried using ismember to look for the zeros but had no luck. I'm not very good when it comes to doing operations on cells. I need this to remain a cell array also. Thanks for any help.

points = {[-24.7697910000000,-15.8191235000000],0,[-12.6771670000000,20.4587480000000],0;0,[-20.6771670000000,-3.54125200000000],[-11.9803417500000,-14.5401785500000],0;0,[-20.6771670000000,-3.54125200000000],[4.32283300000000,-1.04125200000000],0;0,[13.0196582500000,-12.0401785500000],0,[-24.7697910000000,-15.8191235000000];[-11.9803417500000,-14.5401785500000],0,[4.32283300000000,-1.04125200000000],0;0,[-12.6771670000000,20.4587480000000],0,[13.0196582500000,-12.0401785500000];}

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Answer 1

Sean de Wolski 2012-4-23

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https://ww2.mathworks.cn/matlabcentral/answers/36313-remove-zero-entries-from-cell-arrays#answer_45448

在 MATLAB Online 中打开

points = {[-24.7697910000000,-15.8191235000000],0,[-12.6771670000000,20.4587480000000],0;0,[-20.6771670000000,-3.54125200000000],[-11.9803417500000,-14.5401785500000],0;0,[-20.6771670000000,-3.54125200000000],[4.32283300000000,-1.04125200000000],0;0,[13.0196582500000,-12.0401785500000],0,[-24.7697910000000,-15.8191235000000];[-11.9803417500000,-14.5401785500000],0,[4.32283300000000,-1.04125200000000],0;0,[-12.6771670000000,20.4587480000000],0,[13.0196582500000,-12.0401785500000];}
p2 = num2cell(points,2);
C = cellfun(@(c)cellfun(@(x)x(x~=0),c,'uni',false),p2,'uni',false);
for ii = numel(C):-1:1
    Cc = C{ii};
    C(ii) = {Cc(cellfun(@(c)~isempty(c),Cc))};
end

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Harold 2012-4-23

Thank you very much.

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Answer 2

Jan 2012-4-23

5
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/36313-remove-zero-entries-from-cell-arrays#answer_45450

在 MATLAB Online 中打开

Another idea:

points = {[-24.7697910000000,-15.8191235000000],0, ...
          [-12.6771670000000,20.4587480000000], 0; ...
          0,[-20.6771670000000,-3.54125200000000],  ...
          [-11.9803417500000,-14.5401785500000],0; ...
          0,[-20.6771670000000,-3.54125200000000], ...
          [4.32283300000000,-1.04125200000000],0; ...
          0,[13.0196582500000,-12.0401785500000],0, ...
          [-24.7697910000000,-15.8191235000000]; ...
          [-11.9803417500000,-14.5401785500000],0, ...
          [4.32283300000000,-1.04125200000000],0; ...
          0,[-12.6771670000000,20.4587480000000],0, ...
          [13.0196582500000,-12.0401785500000]};
C = points(cellfun(@(x) ~isequal(x, 0), points));

"Automatically resize" is not unique: Should the number of rows or columns be adjusted?

C = reshape(C, size(points, 1), []); % For equal column length

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Harold 2012-4-25

This did not work. Order in each row is very important for what I need to do.

Jan 2012-4-25

Dear Harold, I'm sure you can solve this problem by your own using the commands TRANSPOSE, RESHAPE and/or PERMUTE. The main problem is solved by the CELLFUN call, and the finetuning is up to you.

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