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Remove attributes

The following code removes specified attributes from an ARFF file and prints the result to stdout.

The class takes the following parameters:

  • ARFF file
  • attribute index/indices
  • inversion of index/indices (false/true) 
     import weka.core.Instances;
 import weka.filters.Filter;
 import weka.filters.unsupervised.attribute.Remove;

 import java.io.BufferedReader;
 import java.io.FileReader;

 public class RemoveTest {
   /**
    * takes an ARFF file as first argument, the number of indices to remove
    * as second and thirdly whether to invert or not (true/false).
    * Dumps the generated data to stdout.
    */
   public static void main(String[] args) throws Exception {
     Instances       inst;
     Instances       instNew;
     Remove          remove;

     inst   = new Instances(new BufferedReader(new FileReader(args[0])));
     remove = new Remove();
     remove.setAttributeIndices(args[1]);
     remove.setInvertSelection(new Boolean(args[2]).booleanValue());
     remove.setInputFormat(inst);
     instNew = Filter.useFilter(inst, remove);
     System.out.println(instNew);
   }
 }
    The same can be achieved with the following filter commandline (add -V to invert the selection):
 java weka.filters.unsupervised.attribute.Remove -R <indices> -i <input> -o <output>

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