Creating and deleting virtual variables

Creating new virtual variables

Complete the following steps to create a new virtual variable.

Click Dataflow to display the Dataflow window.
On the Shortcut (right-click) menu, point to New then click Variable.
The New variable dialog box will appear.
Type a name in the Name text box (or accept the default).
Choose an operator.
Click OK and the Variable Properties dialog box will automatically open at the Operands page.
Choose the operand(s) for creating the virtual variable
Note: When an operator requires two or more operands for input, only pings with the same ping geometry will be used to create the virtual variable. See Using multiple operands for more information.
Set variable properties as necessary.
Notes:
- New virtual variables by default inherit their Calibration Source. See Calibration settings for virtual variables for further information.
- New virtual variables copy some general properties from their operand(s). See Inheritance of Properties for more information.

Notes:

If you often create the same virtual variables in your EV files, you can create a template EV file with the virtual variables and their properties already defined. See About templates for more information.
It is also possible to Import virtual variables from one EV file into another.
If your virtual variable appears blank when viewed in an echogram window, the operand variables may not have matching pings. See Matching Pings for more information.
You can Copy-and-Paste a virtual variable or a section of a virtual variable chain to another or same EV file.

Complete the following steps to delete a virtual variable.

Note: Delete is not be available if the selected variable is a raw variable.

Complete the following steps to delete all virtual variables.

Click Dataflow to display the Dataflow window.
On the Object menu, click Delete All Virtual Variables.
Note: This will also delete any unavailable virtual variables imported with a Template.