Create a vector with the non-zero indices of a cell array

Question

Alberto Acri 2023-7-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2000722-create-a-vector-with-the-non-zero-indices-of-a-cell-array

回答： Dyuman Joshi 2023-7-26

采纳的回答： Dyuman Joshi

在 MATLAB Online 中打开

I have a cell array. I need to create a column vector that returns the non-empty row indices.

I have tried this way but there is something to improve.

idx = find(~cellfun(@isempty,matrix),1);
% idx = [2;4]; % this is the result I need to get

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Answer 1

Dyuman Joshi 2023-7-26

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2000722-create-a-vector-with-the-non-zero-indices-of-a-cell-array#answer_1278937

在 MATLAB Online 中打开

%Random data
y = {[],[];[] repmat({rand},3,3); [] []; repmat({rand},4,3) []}
y = 4×2 cell array
    {0×0 double}    {0×0 double}
    {0×0 double}    {3×3 cell  }
    {0×0 double}    {0×0 double}
    {4×3 cell  }    {0×0 double}
%Find if all cells in a row are empty or not and then negating
z1 = ~all(cellfun('isempty', y),2)
z1 = 4×1 logical array
   0
   1
   0
   1
idx1 = find(z1)
idx1 = 2×1
     2
     4

Another approach using any() instead of all() -

%Find if any cells in a row are not empty
z2 = any(~cellfun('isempty', y),2)
z2 = 4×1 logical array
   0
   1
   0
   1
idx2 = find(z2)
idx2 = 2×1
     2
     4