Current version of the modelica translator can only handle array of components with fixed size

Question

I created an part with the AC library, and when I was trying to simulate the model, there is an error says \"Current version of the modelica translator can only handle array of

Answer 1

Consider the following simple model:

model M
  parameter Integer n(start=3, fixed=false);
initial algorithm
  n := n;
end M;

It has a parameter n which can be changed before simulation starts. And array dimensions need to be parameter expressions. So you would think that the following model would be legal:

model M2
  Real arr[n] = fill(1, n);
  parameter Integer n(start=3, fixed=false);
initial algorithm
  n := n;
end M2;

But it isn't since Modelica tools will expand the number of equations and variables to get a fixed number. (According to the language specification, n is a structural parameter; it is not well defined what restrictions these have - most Modelica tools seem to require them to behave like constants which means only fixed=true parameters with a binding equation that depends only on other structural parameters or constants).