I'm trying to make a simple field calculation with ArcGIS 9.3:
New field = Old field - Old field(first value)
which in Calculate Field with python code should be
Expression: !Old field! - first
Code Block: list= [AngOriz] first = list
The error is ERROR 000539: Runtime error : name 'AngOriz' is not defined Failed to execute (Calculate Field).
How could I tranform a column field into a list?