MATLAB: Delete Cells from Cell Array, when size is less than 50% of biggest cell

cell array

Hey guys, I have an Cell Array, with cells only containing nx2 matrices. 
>> a = {[1,2;3,4;5,6;7,8],[9,10;11,12],[13,14;15,16;17,18]}
>> celldisp(a)
 
a{1} =
     1     2
     3     4
     5     6
     7     8
a{2} =
     9    10
    11    12
a{3} =
    13    14
    15    16
    17    18
I am tying to find a way to only keep thoose Cells from the Cell Array which size (number of rows) is greater than 50% of the biggest Cell, so that my output looks like this:
>> a = {[1,2;3,4;5,6;7,8],[13,14;15,16;17,18]}
a{1} =
     1     2
     3     4
     5     6
     7     8
a{2} =
    13    14
    15    16
    17    18

Best Answer

Here one way:
The given cell data
a={[1,2;3,4;5,6;7,8],[9,10;11,12],[13,14;15,16;17,18]}
Check data
a =
  1×3 cell array
  {4×2 double}    {2×2 double}    {3×2 double}
Get the rows ('1') of all cell elements, if columns, use '2'
cell_sizes=cellfun('size',a,1);
Get the max size of rows and 50% of the row size
max_size=max(cell_sizes);
th=max_size*0.5;
Apply the condtion for rows more than 50% of max size (Get the indices, those are lesser or equal)
idx=find(cell_sizes<=th);
Assign all cell elements with particular indices idx with blanks ([])
a(idx)=[];
Remove all those are blanks cell elements
a(cellfun('isempty',a)) = []
Result:
a =
  1×2 cell array
  {4×2 double}    {3×2 double}
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