Model Browser User's Guide

Variable and Filter Editors

Variable Editor

You can define new variables in terms of existing variables:

1. Click the 
   
    toolbar button in the User-Defined Variables and Filtering window.
2. Choose the menu item Variable -> New Variable.

1. Alternatively, select the Variable Expression pane by clicking in it, then press Insert.

• The Variable Editor dialog appears.

• Define the new variable by writing an equation in the edit box at the top of the Variable Editor dialog.

You can type directly in the edit box or add variable names and operators by double-clicking them. In the case of variable names especially, this latter method avoids typing mistakes. Variable names are case sensitive.

The preceding example shows a definition for a new variable called POWER that is defined as the product of two existing variables, tq and n, by entering POWER = tq x n.

• Click OK to add the new variable to the current data set.

New variables you create in the Variable Editor then appear in the Variable Expression pane of the User-Defined Variables and Filtering window.

New variables, along with the original variables, appear in the list view (in the Data Information pane) and the new variable definition is included in the description field (to the right of the units column; you might have to scroll or resize to see it).

Filter Editor

A filter is the name for a constraint on the data set used to exclude some records. To reach the Filter Editor:

1. Click the toolbar button   in the User-Defined Variables and Filtering window.
2. Select the menu item Filters -> New Filter.

1. Alternatively, select the Filter Expression pane by clicking in it, then press Insert.

• The Filter Editor dialog appears.

You define the filter using logical operators on the existing variables.

In the preceding example, n>1000, the effect of this filter is to keep all records with speed (n) greater than 1000.

3. Click OK to impose new filters on the current data set.

1. This new filter appears in the Filter Expression pane of the User-Defined Variables and Filtering window.

   The Filtration results pie chart shows how many records have been removed by the imposition of this filter, and the number of records changes accordingly (for example, Records 200/264 indicates that 64 records have been filtered out).

User-Defined Variables and Filtering

Storage