Counting number of nonempty cells within a cell

I have a 32x3 cell and I want to count the number of nonempty cells within it. When I use N = nnz(my_cell), this is the error I get

Undefined function 'nnz' for input arguments of type 'cell'.

Answer 1

[Walter Roberson]

nnz(~cellfun(@isempty, my_cell))

Answer 2

[David Hill]

nnz(cell2mat(my_cell));%assuming each cell is a number

[Julia Gorman]

So beacsue each cell is not a number but another cell, this is the error I get when using this:

Error using cat

Dimensions of arrays being concatenated are not consistent.

Error in cell2mat (line 86)

m = cat(2,m{:});

[David Hill]

Attach your cell array.

for k=1:32;
  for m=1:3;
    a{k,m}=randi(30,1)-1;%a is a 32x3 cell array of numbers
  end
end
N=nnz(cell2mat(a))

N = 94

[Walter Roberson]

The question is not about nonzero cells, it is about nonempty cells, in a context where cells might contain different number of entries each. For example, length 5, length 0, length 3