Expression Editor
The Expression Editor dialog box allows you to enter expressions and tables for selected variables. You can also create derived variables for output and control the viewing window. The Expression Editor is used for any entry field that displays Edit Local/GlobalExpression to the right of the variable field.
Launching the Expression Editor
To launch the Expression Editor, in the Operations group of the Flow Analysis tab, click 
Expression Editor. Enter the expression in the box and click OK.
Expression Editor. Enter the expression in the box and click OK.This section provides information on the basics of the Expression Editor, and the functions and variables available in an expression as follows:
• Examples