Move empty cell in a row

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Lorenzo Lasagni
Lorenzo Lasagni on 11 May 2018
Edited: Stephen on 11 May 2018
Hello, I've a cell array structured like this:
{1,2,3,4,5,[],[],[];
6,7,8,[],9,10,[],[];
11,12,13,[],[],[],14,15}
I would like to move the empty cell at the end of the row to eliminate the column after and have only 5 columns and no more 8. How can I do?
Thanks a lot, Lorenzo

Accepted Answer

Guillaume
Guillaume on 11 May 2018
Another option, which may or may not be faster than Rik's (I haven't tested but I suspect it's faster since it doesn't do any sorting:
C = {1,2,3,4,5,[],[],[];
6,7,8,[],9,10,[],[];
11,12,13,[],[],[],14,15}
newC = C'; %tranpose since matlab works by column
newC = newC(~cellfun(@isempty, newC)); %remove all empty cells
newC = reshape(newC, [], size(C, 1))'
This assumes that there is the same number of empty cells in each row.
  2 Comments
Lorenzo Lasagni
Lorenzo Lasagni on 11 May 2018
They are both working well, but yes actually this is faster, thanks both.

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More Answers (1)

Rik
Rik on 11 May 2018
Edited: Rik on 11 May 2018
Does cell2mat work for you? I you want to keep it as a cell, you can also follow it up with num2cell.
A={1,2,3,4,5,[],[],[];
6,7,8,[],9,10,[],[];
11,12,13,[],[],[],14,15};
B1=cell2mat(A);
B2=num2cell(cell2mat(A));
In cases where each non-empty cell contains arrays, or different data types, the code below can be used, although there might be a more elegant/faster method.
A={1,2,3,4,5,[],[],[];
6,7,8,[],9,10,[],[];
11,12,13,[],[],[],14,15};
for row=1:size(A,1)
temp=A(row,:);
bin=cellfun('isempty',temp);%much faster than @isempty
[~,order]=sort(bin);%sort the empty cells to the back
A(row,:)=A(row,order);%might be a few ms faster than A(row,:)=temp(order);
end
%remove all completely empty columns
A(:,all(cellfun('isempty',A),1))=[];
  2 Comments
Rik
Rik on 11 May 2018
My edit should work for you. If it doesn't, please let me know.

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