```
field1 = 'f1';  value1 = [1 2];
field2 = 'f2';  value2 = {1, 2, 32, 'text'};
field3 = 'f3';  value3 = [pi pi.^2];
field4 = 'f4';  value4 = [1 2 3];
s = struct(field1,value1,field2,value2,field3,value3,field4,value4);

x = cellfun(@(u) numel(u), value2); %%% WORKS FINE
x = cellfun(@(u) numel(u), s.f2); %%%% THROWS ERROR
x = cellfun(@(u) numel(u.f2), s); %%%% THROWS ERROR

```

Can someone give explaination why the last 2 lines throws error? The error is :

```
Error using cellfun
Input #2 expected to be a cell array, was double instead.

```