how to solve Conversion to cell from double is not possible

i have the following cell array F=

                                   [710x1 double]

                                   [711x1 double]

                                   [711x1 double]

                                   [713x1 double]
my objective is to know the  number of elements in  each cell array and finally get resul looks like  
                                   [710]

                                   [711]

                                   [711] ...
for this i used the following code
                              for   i=1:length(F);
                                 f(i)=numel(f{i,1});
                                             end
but i get the Warning: Number of elements exceeds maximum flint 2^53-1.
The result may be inaccurate. 
*Conversion to cell from double is not possible.*
                            Any solution Ps. Thanks!

Answer 1

[Azzi Abdelmalek]

F={1;1:2;1:3;5:10}
f=zeros(numel(F),1);
for i=1:numel(f);
       f(i)=numel(F{i});
end  
f

Or simply

f=cellfun(@numel,F)

[gustavo sanchez]

Thanks Azzi!!