Deleting a Parameter

You can delete parameters, constants, or variables. If modifiers are defined, for example, start values, impact analysis is performed to best handle the hanging modifiers that is the result of deleting the parameter.

This task shows you how to:

Delete a Parameter without Modifiers
Delete a Parameter with Modifiers

Delete a Parameter without Modifiers

You can delete a parameter, constant or variable that has no modifiers defined, for example, a start value.

Before you begin: From the Package Browser, activate a class containing parameters, constant or variables.

The parameters, constants and variables of the selected component appear from the Parameter and Variable Editor.

From the Parameter and Variable Editor, select a parameter.
Tip: You can multiselect parameters, constants and variables using the Ctrl key.
Select Delete the selected parameter, constant or variable from the Parameter and Variable Editor.
The parameter, constant or variable is deleted.

Delete a Parameter with Modifiers

You can delete a parameter, constant or variable that has modifiers defined, for example, a start value. In such case a impact analysis is performed.

In this scenario, you create a model with a parameter and define a start value for that parameter. Then you try to delete the parameter and observe the impact analysis.

Before you begin: Do the following to create a model with a parameter that has a start value defined in the model it is used in:

In a library, create a model MyTest and a model MyApplication.
In MyTest model, define a real parameter Dummy1.
Instantiate MyTest in MyApplication.
In MyApplication, select MyTest, and define a start value of the parameter Dummy1.
Tip: You can define a start value for Dummy1 by typing (start=0.5) in the parameter dialog of MyTest.

The parameter Dummy1 now has a modifier, a start value, defined externally, where the model MyTest is used. This modifier is a part of the Modelica code in MyApplication.

To delete the parameter Dummy1:
1. Activate MyTest.
2. From the Parameter and Variable Editor, select Dummy1.
3. Select Delete the selected parameter, constant or variable .
Because of the start value of the parameter, the impact analysis dialog box appears, displaying the following information:
- Deleting Dummy1 in MyTest affects MyApplication.
- It is possible to update MyApplication after deleting Dummy1.
  In our scenario, the start value modifier in MyApplication may be removed.
Note: Connections and other equations cannot be updated.

In this dialog box, select what action you want performed:

Update to update MyApplication by removing the start value modifier.
Tip: Activate Always update without confirmation if you always want this action without displaying any dialog box.
Just Delete; Skip Update to not update MyApplication.
The start value modifier is not removed, you get errors when trying to execute MyApplication.

Notes:

There is a flag Advanced.ActivateSmartDelete that corresponding to the selection. The flag can have the following values:


Value of flag	Action
0	Do not display the message, and always delete without any update.
1 (default)	Do display the message, and act according to selection in menu.
2	Do not display the message, and always update (if possible).

Tip: If you have selected to not display the menu but want it back, you can set Advanced.ActivateSmartDelete=1 to get the menu again. See Displaying or Changing Flags by Scripting.

There are some limitations of the functionality:
- Connections to the deleted variable are not deleted.
- Equations in the Modelica Text layer using the deleted variable are not updated.
- Undo cannot be applied to deletion of variables.