check the index of cell which were removed

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 ??

Answer 1

[Stephen23]

Using logical indices:

B_remove = cellfun('isempty',A)
B_keep = ~B_remove

If you really want the subscript indices then use find.

[ha ha]

My question mean: " I want to find the index matric where the cell is not empty". If i use your code:

cellfun('isempty',A)

The result is: 4x1 logical. That is I don't want to see

I hope my index matrix will be : [2;3]=result

[Stephen23]

As my answer told you:

find(~cellfun('isempty',A))

If you can use them then logical indices are more efficient.