I have a project based on data from a water company, but the arrow heads are all pointing in the wrong direction to indicate the direction of flow. Basically I need to turn all the SYMBOLROTA values to negatives. How can I change all the values of a set of features to become minus - it might be a search function of a script or something?
Better than that would be to be able to change the type of rotation (like you can do in AutoCAD) to be anti-clockwise rather than clockwise. I haven't been able to find out how to do that but that would be the easiest?