How do I find out a struct is empty?

There are instances in a .mat file where there is information and no information within a particular struct. I'm trying to figure out how to identify that within the struct where there is no furture information avaliable, it's an empty struct.

Let's say a .mat file contains below

A = struct;
A.B = '1';
A.C = '2';
A.D = '3';

but there is another file that contains only what's below

A = struct;

Depending on what which file, or mutiple files that contain various numbers of variables, how do I check if a struct is empty so that I'll be able to initialize the data that is not empty into EditFields of an application.

Answer 1

[Voss]

It looks like you want to find out whether a struct has any fields or not, for which you can use isempty(fieldnames(A))

A = struct;
A.B = '1';
A.C = '2';
A.D = '3';

isempty(fieldnames(A))

ans = logical
   0

A = struct;

isempty(fieldnames(A))

ans = logical
   1

[Voss]

Whether the struct is empty is another question, as empty and non-empty struct arrays can have fields or no fields.

A = struct('B',{}); % empty struct array with one field ('B')
is_empty_struct = isempty(A), has_no_fields = isempty(fieldnames(A))

is_empty_struct = logical
   1

has_no_fields = logical
   0

A = struct('B',{1 2 3}); % non-empty (size 1-by-3) struct array with one field ('B')
is_empty_struct = isempty(A), has_no_fields = isempty(fieldnames(A))

is_empty_struct = logical
   0

has_no_fields = logical
   0

A = rmfield(A,'B'); % non-empty struct array with no fields
is_empty_struct = isempty(A), has_no_fields = isempty(fieldnames(A))

is_empty_struct = logical
   0

has_no_fields = logical
   1

A = A([]); % empty struct array with no fields
is_empty_struct = isempty(A), has_no_fields = isempty(fieldnames(A))

is_empty_struct = logical
   1

has_no_fields = logical
   1

[Sean]

Thank you for helping me out, I tried to implement it, but I implemented a try catch statement and works.