question: private static String printClusterings ( Clusterer clusterer , String trainFileName , String testFileName , Range attributesToOutput ) throws Exception { StringBuffer text = new StringBuffer ( ) ; int i = 0 ; int cnum ; DataSource source = null ; Instance inst ; Instances structure ; if ( testFileName . length ( ) != 0 ) { source = new DataSource ( testFileName ) ; } else { source = new DataSource ( trainFileName ) ; } structure = source . getStructure ( ) ; while ( source . hasMoreElements ( structure ) ) { inst = source . nextElement ( structure ) ; try { cnum = clusterer . clusterInstance ( inst ) ; text . append ( i + " " + cnum + " " + attributeValuesString ( inst , attributesToOutput ) + "\n" ) ; } catch ( Exception e ) { text . append ( i + " Unclustered " + attributeValuesString ( inst , attributesToOutput ) + "\n" ) ; } i ++ ; } return text . toString ( ) ; }
target:  Print the cluster assignments for either the training or the testing data.