Data Structure in Matlab Constructor Function

[bytengineer]

Could someone please explain me the following Matlab code?
It has the constructor function to pass the data into the myClass variables (a,d,noInput) and the constructor has
the data structure (StructParameters). As I understand so far,
by using the data structure (StructParameters) the constructor function passes the data into the myClass variables.

- What is the purpose of using if-else condition with StructParameters.noInput? what is the meaning of that in this Matlab code?
- How can I access into the structured data, StructParameters?
- How can I run the following error condition? Any exaple commands for this?
***error('Input argument has to be struct.')

Many thanks in advance!!!

classdef myClass
properties
 a;
 d;
 noInput;
end
 
methods
 function obj=myClass(StructParameters)
 if nargin==0
 StructParameters.noInput=1;
 else
 StructParameters.noInput=0;
 end
 
 if ~isstruct(StructParameters)
 error('Input argument has to be struct.')
 else
 % load the parameters
 F=fields(StructParameters);
 for x=1:length(F)
 obj.(F{x})=StructParameters.(F{x});
 end
 end
 
 if ~isfield(StructParameters, 'a')
 obj.a=[1 2; 4 5];
 end
 
 if ~isfield(StructParameters, 'd')
 obj.d=[0 1; 4 5];
 end
 
 end
 
 end
 
end