Matrix size comparison

>> aZeros = zeros(200,200);
>> aOnes = ones(200,200);
>> aSparseZeros=sparse(200,200);
>> aSparseOnes =sparse(200,200); %first create sparse matrix
>> aSparseOnes(:,:) = 1; %assign all values to one
>> whos %display memory information for this workspace
  Name                Size              Bytes  Class     Attributes

  aOnes             200x200            320000  double
  aSparseOnes       200x200            320000  double
  aSparseZeros      200x200               816  double    sparse
  aZeros            200x200            320000  double

>>