Update MultipleResonance.mo

[hubertus65]

Fixed to make type more clear, and make it work in Modelon Impact. Also, removed an unused line of code. This is tested in latest version of Modelon Impact, and Dymola, and works in both.

[AHaumer]

ok for me

[HansOlsson]

This does not work in Dymola 2024x, and I cannot see how it would work according to the specification.
It may have worked in earlier versions (depending on flags) where we were a bit too aggressive in optimizing multiplication by zero.

Longer explanation for why:
Modelica.Units.SI.ComplexImpedance is just a Complex with units added - and should thus be seen as a constructor call according to:

https://specification.modelica.org/master/overloaded-operators.html#overloaded-constructors

There is only one constructor-function in Complex - fromReal where the imaginary part has default-value 0; so the only match we consider would be:
Complex.'constructor'.fromReal(re=100+Complex.j*0, im=0) which fails as the first argument is Complex and not real.
Having "copy-constructor" for types may be an interesting idea, but it hasn't been added yet.

How to correct:

However, Modelica.Units.SI.ComplexImpedance(100) or Modelica.Units.SI.ComplexImpedance(100, 0) would be valid.

[Harisankar-Allimangalath]

@hubertus65 @AHaumer can you please look in to the above suggestion and decide on how to proceed with this .

Thankyou

[beutlich]

How to correct:

Addressed by #4374.