Why is `struct('name', value)` different with dot notation?

a = {{'abc'}};
S1 = struct('f', a};
S2.f = a;

I thought S1.f and S2.f have the same value. But it's not.

S1.f = {'abc'};

S2.f = {{'abc'}};

Why?

Answer 1

[Fangjun Jiang]

It is in the document. Check this example in the document. One creates a 1x2 struct array. The other creates a single struct.

>> s = struct('type',{'big','little'},'color','red')
s = 
  1×2 struct array with fields:
    type
    color
>> s = struct('type',{{'big','little'}},'color','red')
s = 
  struct with fields:

     type: {'big'  'little'}
    color: 'red'