Save numbers (present within a cell) into a single matrix

Hi! How can I save the numbers the numbers contained in this cell as a matrix?

Also, instead of blanks [] I should have zeros 0. Thank you!

Answer 1

[Stephen23]

S = load('example.mat');
C = S.example

C = 4×4 cell array
    {[10]}    {[      12]}    {[      86]}    {0×0 double}
    {[91]}    {[      24]}    {0×0 double}    {0×0 double}
    {[ 4]}    {0×0 double}    {0×0 double}    {0×0 double}
    {[31]}    {[      66]}    {[      49]}    {0×0 double}

C(cellfun(@isempty,C)) = {0};
M = cell2mat(C)

M = 4×4

10 12 86 0 91 24 0 0 4 0 0 0 31 66 49 0

[Alberto Acri]

Thank you for your answer! Could you tell me how I can know the amount of positive numbers (excluding zeros) within the matrix (or cell)? In this case I have 9 numbers in total.

[Stephen23]

Count all non-zeros:

nnz(M)

Count only positive values:

nnz(M>0)