| 1. | Select the update subpanel. | 
| 2. | Indicate the vectors you want to update: | 
| • | Pick the vectors on the screen | 
or
| • | Click vectors and choose the vectors from the pop-up menu. | 
| 3. | Modify the appropriate information in the menu. | 
| 4. | Click update. | 
An update menu is displayed.
| 5. | Select the data fields on the vectors that you want to update. | 
| 6. | Click update. | 
A two-noded vector that is updated using base and magnitude loses its head node association.