On Wed, Aug 11, 2010 at 1:49 AM, Ricardo Filipe Soares Garcia da <[email protected]> wrote: > > provider = pointLayer.dataProvider() > newField = QgsField("channel", QVariant.Double) > provider.addAttributes([newField]) > newFieldIndex = provider.fieldNameIndex(newField.name()) > #more code > allAttrs = provider.attributeIndexes() > provider.select(allAttrs) > feat = QgsFeature() > while provider.nextFeature(feat): > # more code, calculating the value of the 'channelValue' variable > values = {feat.id() : {newFieldIndex: QVariant(channel)}} > provider.ChangeAttributeValues(values)
Btw. for a better performance, it is good to only fill the new values into the 'values' dictionary within the 'while' cycle. Afterwards you can run changeAttributeValues() once to modify all features. Anyway if you do not work with lots of features, it is not so imporant. Martin _______________________________________________ Qgis-developer mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-developer
