# Changing the Axes of the Trace (Independent and Fixed)

Set the independent axis of the far field trace to Phi and the fixed axis to Theta = 30°.

myFarFieldTrace.IndependentAxis = "Phi"
myFarFieldTrace:SetFixedAxisValue("Theta",30, "deg")
1. Search for the FarFieldTrace object in the Help1.
2. In the Help under FarFieldTrace > Property List, search for an applicable property to specify the independent axis:
• IndependentAxis

The result is then:

IndependentAxis = "Phi"
3. Determine the syntax to prepend to IndependentAxis:
1. Since IndependentAxis is a property, it is indicated by prepending a “.”:
The result is then:
.IndependentAxis = "Phi"
2. Since we already have a handle on the trace, the result is:
myFarFieldTrace.IndependentAxis = "Phi"
4. In the Help under FarFieldTrace > Method list, search for an applicable method to specify the fixed axis:
• SetFixedAxisValue (axis string, numvalue number, unit string)
• SetFixedAxisValue (axis string, strvalue string)
To specify the fixed axis, we will use the method:
SetFixedAxisValue (axis string, numvalue number, unit string)

The result is then:

SetFixedAxisValue("Theta", 30, "deg")
5. Determine the syntax to prepend to IndependentAxis:
1. Since SetFixedAxisValue is a method, it is indicated by prepending a “:” (colon):
The result is then:
:SetFixedAxisValue("Theta", 30, "deg")
2. Since we already have a handle on the trace, the result is:
myFarFieldTrace:SetFixedAxisValue("Theta", 30, "deg")
1 The API is available in the Feko Scripting and API Reference Guide (PDF) or Feko WebHelp.