question: public void renameAttributeValue ( Attribute att , String val , String name ) { int v = att . indexOfValue ( val ) ; if ( v == - 1 ) { throw new IllegalArgumentException ( val + " not found" ) ; } renameAttributeValue ( att . index ( ) , v , name ) ; }
target:  Renames the value of a nominal (or string) attribute value. This change only affects this dataset.