Examples of weka.core.Instances.instance()

weka.core.Instances.instance()
Returns the instance at the given position. @param index the instance's index (index starts with 0) @return the instance at the given position

    m_Log.statusMessage("Evaluating model for fold "
            + (fold + 1) + "...");
    for (int jj=0;jj<test.numInstances();jj++) {
      plotInstances.process(test.instance(jj), current, eval);
      if (outputPredictionsText) {
        classificationOutput.printClassification(current, test.instance(jj), jj);
      }
    }
        }
        if (outputPredictionsText)
    classificationOutput.printFooter();

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        if (outputPredictionsText) {
    printPredictionsHeader(outBuff, classificationOutput, "test split");
        }
     
        for (int jj=0;jj<test.numInstances();jj++) {
    plotInstances.process(test.instance(jj), current, eval);
    if (outputPredictionsText) { 
      classificationOutput.printClassification(current, test.instance(jj), jj);
    }
    if ((jj % 100) == 0) {
      m_Log.statusMessage("Evaluating on test split. Processed "

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        }
     
        for (int jj=0;jj<test.numInstances();jj++) {
    plotInstances.process(test.instance(jj), current, eval);
    if (outputPredictionsText) { 
      classificationOutput.printClassification(current, test.instance(jj), jj);
    }
    if ((jj % 100) == 0) {
      m_Log.statusMessage("Evaluating on test split. Processed "
              +jj+" instances...");
    }

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          // the missing values that are created by default by the lagging
          // process showed inferior performance compared to just letting
          // Weka take care of it via mean/mode replacement


          for (int i = 0; i < result.numInstances(); i++) {
            Instance current = result.instance(i);
            if (current.isMissing(attIndex)) {
              if (!weka.core.Utils.isMissingValue(lastNonMissing)) {
                // Search forward to the next non missing value (if any)
                double futureNonMissing = weka.core.Utils.missingValue();

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                double futureNonMissing = weka.core.Utils.missingValue();


                double x2 = 2; // number of x steps (lastNonMissing is at 0 on x
                               // axis)
                for (int j = i + 1; j < result.numInstances(); j++) {
                  if (!result.instance(j).isMissing(attIndex)) {
                    futureNonMissing = result.instance(j).value(attIndex);
                    break;
                  }
                  x2++;
                }

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                double x2 = 2; // number of x steps (lastNonMissing is at 0 on x
                               // axis)
                for (int j = i + 1; j < result.numInstances(); j++) {
                  if (!result.instance(j).isMissing(attIndex)) {
                    futureNonMissing = result.instance(j).value(attIndex);
                    break;
                  }
                  x2++;
                }

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                  double offset = lastNonMissing;
                  double slope = (futureNonMissing - lastNonMissing) / x2;


                  // fill in the missing values
                  for (int j = i; j < i + x2; j++) {
                    if (result.instance(j).isMissing(attIndex)) {
                      double interpolated = (((j - i) + 1) * slope) + offset;


                      result.instance(j).setValue(attIndex, interpolated);
                      if (missingTargetList != null) {
                        missingTargetList.add(new Integer(j + 1));

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                  // fill in the missing values
                  for (int j = i; j < i + x2; j++) {
                    if (result.instance(j).isMissing(attIndex)) {
                      double interpolated = (((j - i) + 1) * slope) + offset;


                      result.instance(j).setValue(attIndex, interpolated);
                      if (missingTargetList != null) {
                        missingTargetList.add(new Integer(j + 1));
                      }
                    }
                  }

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    // now check for missing date values (if necessary)
    if (timeStampAtt != null) {


      int attIndex = timeStampAtt.index(); // result.attribute(timeStampName).index();


      double firstNonMissing = result.instance(0).value(attIndex);
      double previousNonMissing = firstNonMissing;
      int firstNonMissingIndex = -1;
      boolean leadingMissingDates = weka.core.Utils
          .isMissingValue(firstNonMissing);

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      int firstNonMissingIndex = -1;
      boolean leadingMissingDates = weka.core.Utils
          .isMissingValue(firstNonMissing);


      for (int i = 0; i < result.numInstances(); i++) {
        Instance current = result.instance(i);


        if (current.isMissing(attIndex)) {
          if (!weka.core.Utils.isMissingValue(previousNonMissing)) {
            double newV = advanceSuppliedTimeValue(previousNonMissing, detected);
            current.setValue(attIndex, newV);

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