MATLAB: Produce a matrix with the class of its elements

matrix class

Input: 2-dimensional Matrix A
Output: Matrix B, having the same dimensions as A, where each element is the class of the corresponding element in A.
e.g. If A(1,1) = double, then B(1,1) = double
My code is as follows:
function B = whatclass(A)
[row,col] = size(A);
B = [];
for ii=1:row
  for jj=1:col
      B(ii,jj) = class(A(ii,jj));
  end
end
end
I am getting the error below:
Assignment has more non-singleton rhs dimensions than non-singleton subscripts
Error in integerize (line 6) B(ii,jj) = class(A(ii,jj));
Any thoughts? Help in advance.

Best Answer

Assuming that the input is a cell array (otherwise this task does not make much sense):
>> A = {double(1),single(2);uint8(3),int64(4)}
A = 
    [1]    [2]
    [3]    [4]
>> B = cellfun(@class,A,'UniformOutput',false)
B = 
    'double'    'single'
    'uint8'     'int64'
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