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

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

Answer 1

[Dyuman Joshi]

%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