Parameters are objects that hold values and that are used in other objects of the model, for instance in Transfers and Expressions. The value of a parameter must remain constant through a simulation, and is given either as a number or a probability density function.
For time dependent data, use a Lookup table.
From the Projects window
From the Matrix window
From the Blocks window
The block editor is shown by right-clicking the block in a window and selecting Edit. In the Blocks window, you can also show the block editor by selecting the block and clicking the button, or by double-clicking the right-most “validation” column of the block.
The block editor has three tabs:
This page lets you edit basic properties such as name, sub-system and base unit. See editing properties for more information.
Here you edit index specific values such as nominal values and probability density functions. See editing values for more information.
You can assign both a value and a probability distribution to a parameter. In order for the PDF to be used during the simulation, you must select the parameter in the probabilistic settings window.
Dimension - You can specify the dimension of the parameter by using the Type drop down list. Depending on the dimension the index drop down lists are activated.
Data - The data table contains the following columns:
By clicking the button several fields will be presented for different statistics. These statistics can be used by probability density functions (PDF).
Some PDFs will allow you to use the statistics fields instead rather than supplying the value in the function. To use the field, enter “auto” (or click the “A” button) in the argument field.
Example: The exponential distribution requires the arithmetic mean as its only argument. When you have selected the exp distribution, enter “auto” in the “mean” field for the distribution. Then enter the mean value in the table field called “arithmetic mean”.
The database tab lets you quickly import values for the edited parameter from either the local or external database. Please refer to Quick parameter import.
|Note||Most block properties can be edited directly in the Blocks window.|