question: public String toCSV ( ) { StringBuilder builder = new StringBuilder ( ) ; builder . append ( ",,Predicted Class,\n" ) ; builder . append ( ",," ) ; for ( T predicted : classes ) { builder . append ( String . format ( "%s," , predicted ) ) ; } builder . append ( "Total\n" ) ; String firstColumnLabel = "Actual Class," ; for ( T actual : classes ) { builder . append ( firstColumnLabel ) ; firstColumnLabel = "," ; builder . append ( String . format ( "%s," , actual ) ) ; for ( T predicted : classes ) { builder . append ( getCount ( actual , predicted ) ) ; builder . append ( "," ) ; } builder . append ( getActualTotal ( actual ) ) ; builder . append ( "\n" ) ; } builder . append ( ",Total," ) ; for ( T predicted : classes ) { builder . append ( getPredictedTotal ( predicted ) ) ; builder . append ( "," ) ; } builder . append ( "\n" ) ; return builder . toString ( ) ; }
target:  Outputs the ConfusionMatrix as comma-separated values for easy import into spreadsheets