MATLAB: In a cell with matrix entries, loop through to delete empty matrices

cell arraysloopmatrix

I have a 32385×1 cell that contains 32385 matrices. Only 476 of those matrices contain numbers. Is there an easy way to loop through the cell and delete the empty matrices, so only the ones containing numbers remain in the cell (in the same order)?

Thank you!

Best Answer

Let R denote your cell array that contains the matrices, then the following should suffice:

K =  R(~cellfun(@isempty,R));

Conrad

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for i = 1:numel(Result)
  [r, c]= size(Result{i});
  assert(c == 1, 'Number of columns must be 1.') 
  if r < 5, Result{i}{5,1} = []; end
end

MATLAB: Manipulate data in cells

Hi Rebecca,

I think it would be easiest just to loop through all of the elements of the matrix. To access a given element in the cell array 'bins', use the curly braces {}, in a way that you similarly would use parentheses () for matrices.

For the first part:

 output = cell(size(bins));
 for k=1:length(bins), 
     mat = bins{k};   %get element in cell

     mat(:,5)=[];     %remove 5th column

     output{k} = mat;  %assign to output cell array 
end

The second part of your request is unclear. Once you break each row into four separate groups of three columns, what do you want to do with the data? Are you assigning each group as an element of the cell array (such that the final cell array is 255x4)? If so, this revised code will work:

 output = cell(length(bins), 4);
 for k=1:length(bins), 
     mat = bins{k};   %get element in cell
     mat(:,5)=[];     %remove 5th column
     output{k,1} = mat(:,[1 2 3]);  %break columns into groups and 
     output{k,2} = mat(:,[1 2 4]);  % assign to cell array
     output{k,3) = mat(:,[1 3 4]);
     output{k,4} = mat(:,[2 3 4]);
end

Best Answer

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