MATLAB: Check the index of cell which were removed

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Let's say:
A : 4x1 cell class
A={cell_1   ;cell_2   ;    cell_3    ;cell_4 }
A={   []    ;[999,222];[444,222,2000];  []   };
B is index matrix of cell A:
B=[1;2;3;4] %index matrix of cell A
If I wanna remove the "empty cell" out of A, I can use this code:
A_remove=A(~cellfun('isempty',A));
And with respect to A, the index matrix B will be:
B_remove=[2;3]; %remove the index of "empty cell"
How can to find "B_remove" matrix from A &B ??

Best Answer

Using logical indices:
B_remove = cellfun('isempty',A)
B_keep = ~B_remove
If you really want the subscript indices then use find.
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