Is there a way to define Variant Control Objects as Struct in Simulink?

I need to pass to a Simulink Model Reference blocks (defined with Variants) an argument

defined as a Struct, and use this Struct to perform Variant Control. I want to do this because I have too many Variants in the Workspace and I want to better organize my Variants. Is it possible to do this?

Answer 1

[MathWorks Support Team]

The ability to use Structs as Variant Control Objects has been added in MATLAB R2018a.

In MATLAB R2017b and earlier, you will observe the following error message:

'myStruct' is not allowed as the left-hand side of 'myStruct.value'
in variant condition expression 'myStruct.value==1' used by block
'myModel/Controller'. Only enumerated type names are allowed.

In MATLAB R2017b and earlier, it is possible to use Struct to create a Variant Control Object, but there is a limitation in using the Variant Struct to perform Variant Control with Model Reference. However, there is a workaround for better organizing the Variants :

VariantName = 1 ;
Variant.a.varControl= 'Simulink.Variant( ''VariantName == 1'' ) ';
Variant.a.Name = 'a';
Variant.b.varControl= 'Simulink.Variant( ''VariantName == 2'' )' ;
Variant.b.Name = 'b';

eval([Variant.a.Name ' = ' Variant.a.varControl]);  
eval([Variant.b.Name ' = ' Variant.b.varControl]);

The "eval" statement can be put into a function and called after each Variant is set.