What does this operation mean, and what is the function?

Question

I’m having a hard time figuring out what this means.

Can someone explain the operation for me? Specially the m and n values.

I know what system and int is. The screenshot is taking from a premade tutorial, so I’m sure it’s something the owner/author have made. I still just can’t figuring out what it should stand. I can’t see it been created anywhere.

Answer 1

nat and nat1 must be a Class, Interface, DataType, Enumeration, etc. created in the model...

Answer 2

The operation is shown with parameters in C-style, namely a comma-separated list of name:type. A type can be a primitive like int, bool, etc. But it can as well be a class or any other complex type. In your case you should look in your model whether you have classes called nat or nat1. If so, you should consult the editor of the model and tell that there's a convention to start types with a capital letter (so it should be Nat or Nat1).