Matlab: How to generate 0x0 struct array?

Question

I got an .mat file with a variable X:

>> open('3rdPartyInputfile.mat')
>> X

X = 

0x0 struct array with fields:
    a
    b

I tried to create a similar variable like:

>> X1(1).a = [];
>> X1(1).b = [];
>> X1(1)=[]

X1 = 

1x0 struct array with fields:
    a
    b


>> X2(1).a = [];
>> X2(1).b = [];
>> X2(:,:)=[]

X2 = 

0x1 struct array with fields:
    a
    b

Which is close but not identical. The size here are 1x0 or 0x1, instead of the desired 0x0.

How to get it to 0x0?

Answer 1

To get a 0x0 struct you can use

X = struct('a',{},'b',{})

Answer 2

In case you have an existing struct x and want to scale it down to 0x0, you could do the following:

 y=repmat(x,0,0)