Hi redbottle,

The literal translation in Python would be:

# Define field number to be modified
FieldNumber = 1

# New field coordinates
Hx = 1.23
Hy = 2.34

# Retrieve corresponding field data
MyField = TheSystem.SystemData.Fields.GetField(FieldNumber)

# Update field coordinates
MyField.X = Hx
MyField.Y = Hy

I imagine this is the same in MATLAB. The variable Hx and Hy correspond to your variables x and y.

Let me know if this works for you.

Take care,

David