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

      }


      if (leadingMissingDates) {
        if (firstNonMissingIndex > 0) {
          for (int i = firstNonMissingIndex - 1; i >= 0; i--) {
            Instance current = result.instance(i);
            double newV = decrementSuppliedTimeValue(firstNonMissing, detected);
            current.setValue(attIndex, newV);
            if (missingTimeStampList != null) {
              missingTimeStampList.add(new Integer(i + 1));
            }

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    // set all targets to missing
    List<String> fieldsToForecast = 
      AbstractForecaster.stringToList(forecaster.getFieldsToForecast());
    for (int i = 0; i < overlay.numInstances(); i++) {
      Instance current = overlay.instance(i);
      for (String target : fieldsToForecast) {
        current.setValue(overlay.attribute(target), Utils.missingValue());
      }
    }

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        int origIndex = result.attribute(m_timeStampName).index();


        // find first non-missing date and set as base
        GregorianCalendar c = new GregorianCalendar();
        for (int i = 0; i < result.numInstances(); i++) {
          if (!result.instance(i).isMissing(origIndex)) {
            if (m_dateBasedPeriodicity.getPeriodicity() == Periodicity.MONTHLY
                || m_dateBasedPeriodicity.getPeriodicity() == Periodicity.WEEKLY
                || m_dateBasedPeriodicity.getPeriodicity() == Periodicity.QUARTERLY) {
              Date d = new Date((long) result.instance(i).value(origIndex));
              c.setTime(d);

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        for (int i = 0; i < result.numInstances(); i++) {
          if (!result.instance(i).isMissing(origIndex)) {
            if (m_dateBasedPeriodicity.getPeriodicity() == Periodicity.MONTHLY
                || m_dateBasedPeriodicity.getPeriodicity() == Periodicity.WEEKLY
                || m_dateBasedPeriodicity.getPeriodicity() == Periodicity.QUARTERLY) {
              Date d = new Date((long) result.instance(i).value(origIndex));
              c.setTime(d);
              m_dateTimeStampBase = c.get(Calendar.YEAR);
            } else {
              m_dateTimeStampBase = (long) result.instance(i).value(origIndex);
            }

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                || m_dateBasedPeriodicity.getPeriodicity() == Periodicity.QUARTERLY) {
              Date d = new Date((long) result.instance(i).value(origIndex));
              c.setTime(d);
              m_dateTimeStampBase = c.get(Calendar.YEAR);
            } else {
              m_dateTimeStampBase = (long) result.instance(i).value(origIndex);
            }
            break;
          }
        }
        m_addDateMap = new Add();

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        m_addDateMap = new Add();
        m_addDateMap.setAttributeName(m_timeStampName + "-remapped");
        m_addDateMap.setInputFormat(result);
        result = Filter.useFilter(result, m_addDateMap);


        Instance previous = result.instance(0);
        // now loop through and compute remapped date
        for (int i = 0; i < result.numInstances(); i++) {
          Instance current = result.instance(i);


          current = m_dateBasedPeriodicity.remapDateTimeStamp(current,

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        result = Filter.useFilter(result, m_addDateMap);


        Instance previous = result.instance(0);
        // now loop through and compute remapped date
        for (int i = 0; i < result.numInstances(); i++) {
          Instance current = result.instance(i);


          current = m_dateBasedPeriodicity.remapDateTimeStamp(current,
              previous, m_timeStampName);
          previous = current;
          /*

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          }
        }


        // set the values for each instance in the data
        for (int i = 0; i < result.numInstances(); i++) {
          setDerivedPeriodicValues(result.instance(i));
        }
      }
    }


    return result;

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   *           auxiliary attributes.
   */
  public Instances getTransformedData(Instances insts) throws Exception {
    m_originalHeader = new Instances(insts, 0);
    Instances result = insts;
    m_lastHistoricInstance = result.instance(result.numInstances() - 1);


    setupPeriodicMaps(result);
    result = removeExtraneousAttributes(insts);


    // m_lastArtificialTimeValue = -1;

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    }


    if (m_adjustForTrends) {
      int timeStampIndex = result.attribute(m_timeStampName).index();


      m_lastTimeValue = result.instance(result.numInstances() - 1).value(
          timeStampIndex);
      Instance last = result.instance(result.numInstances() - 1);
      Instance secondToLast = result.instance(result.numInstances() - 2);
      /*
       * m_deltaTime = last.value(timeStampIndex) -

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