Using QGIS 2.8.1 i am trying to update an attribute table using the field calculator. its a vector layer of vegetation communities. i am trying to update the area fields in the table. The output example in the calculator shows a correct calculation, but the areas do not update and stay as 0.0000. The field is "real" 10 wide with a precision of 4.
Any ideas on why the table does not update?