public static < V extends NumberVector > NumberVector . Factory < V > getNumberVectorFactory ( Relation < V > relation ) { final VectorFieldTypeInformation < V > type = assumeVectorField ( relation ) ; @ SuppressWarnings ( "unchecked" ) final NumberVector . Factory < V > factory = ( NumberVector . Factory < V > ) type . getFactory ( ) ; return factory ; }
Get the number vector factory of a database relation .