Exercise 1

1 Question

What does a modifier do?

1.1 Answer

2 Easy Example of Using Modifications

Modify
- the start value to 3,
- the min value to -22 and
- the fixed value to true
of the variable test in the class Test below.

class Test parameter Integer test; end Test;

Rewrite the class here.

2.1 Answer

3 Modifiers for Array Values

In this exercise you should modify different values of the following variables:
Set fixed to true in A1.
Set the start value to false in truthvalues.
Set unit to "kV" in the position: first row and second column of A2.
Set the start value on the first row in A3 to the values 3, 5 and 8. In the second row of the matrix the values should be set to 3, 10 and 22.
Set the matrix elements to "Pippi" in A4.

class ModArray Integer A1[5]; Boolean truthvalues[2]; Real A2[2,2]; Integer A3[2,3]; Real A4[2,2]; end ModArray;

3.1 Hint

Remember that each attribute has the same dimensionality as the array itself.
Read more about predefined Types/Classes in "Introduction to Modelica ..." by Peter Fritzson.

3.2 Answer

4 Modification and Access Control

The class Mod, below, contains five variables. Are you allowed to modify all of them? Why/Why not?

class Mod parameter Real x; parameter Real y; parameter Real z; protected parameter Real w; parameter Real s; end Mod;

4.1 Answer