cell array to logical

I have this cell array and i want to convert this to logical array.

Thank you

[stozaki]

Do you treat null values (empty: []) as "false"?

Answer 1

[DGM]

In order to make a logical array of it, you'll have to specify the conditions where the output is true. Consider two examples:

A = {1; 1; 1; []; 1; 1; []; 0; 0.1}

A = 9×1 cell array
    {[       1]}
    {[       1]}
    {[       1]}
    {0×0 double}
    {[       1]}
    {[       1]}
    {0×0 double}
    {[       0]}
    {[  0.1000]}

% true if non-empty
B = ~cellfun(@isempty,A)

B = 9×1 logical array
   1
   1
   1
   0
   1
   1
   0
   1
   1

% true if nonzero
C = cellfun(@(x) x~=0,A,'uniform',false)

C = 9×1 cell array
    {[        1]}
    {[        1]}
    {[        1]}
    {0×0 logical}
    {[        1]}
    {[        1]}
    {0×0 logical}
    {[        0]}
    {[        1]}

% true if non-empty and nonzero
D = cellfun(@(x) ~isempty(x) && x~=0,A)

D = 9×1 logical array
   1
   1
   1
   0
   1
   1
   0
   0
   1

Note that the second example is still a cell array. This is required if empty elements are to be preserved,.

[Jan]

When the elements of the cell array are numerical arrays, this is faster:

B = ~cellfun('isempty', A)

[Ioannis Vourvachakis]

Thank you very much!!