How to use

push

method

in

weka.filters.unsupervised.instance.RemovePercentage

/**
 * Input an instance for filtering. Ordinarily the instance is processed and
 * made available for output immediately. Some filters require all instances
 * be read before producing output.
 * 
 * @param instance the input instance
 * @return true if the filtered instance may now be collected with output().
 * @throws IllegalStateException if no input format has been set.
 */
@Override
public boolean input(Instance instance) {
 if (getInputFormat() == null) {
  throw new IllegalStateException("No input instance format defined");
 }
 if (m_NewBatch) {
  resetQueue();
  m_NewBatch = false;
 }
 if (isFirstBatchDone()) {
  push(instance);
  return true;
 } else {
  bufferInput(instance);
  return false;
 }
}

/**
 * Signify that this batch of input to the filter is finished. Output() may
 * now be called to retrieve the filtered instances.
 * 
 * @return true if there are instances pending output
 * @throws IllegalStateException if no input structure has been defined
 */
@Override
public boolean batchFinished() {
 if (getInputFormat() == null) {
  throw new IllegalStateException("No input instance format defined");
 }
 // Push instances for output into output queue
 Instances toFilter = getInputFormat();
 int cutOff = (int) Math.round(toFilter.numInstances() * m_Percentage / 100);
 if (m_Inverse) {
  for (int i = 0; i < cutOff; i++) {
   push(toFilter.instance(i), false); // No need to copy
  }
 } else {
  for (int i = cutOff; i < toFilter.numInstances(); i++) {
   push(toFilter.instance(i), false); // No need to copy
  }
 }
 flushInput();
 m_NewBatch = true;
 m_FirstBatchDone = true;
 return (numPendingOutput() != 0);
}

/**
 * Input an instance for filtering. Ordinarily the instance is processed and
 * made available for output immediately. Some filters require all instances
 * be read before producing output.
 * 
 * @param instance the input instance
 * @return true if the filtered instance may now be collected with output().
 * @throws IllegalStateException if no input format has been set.
 */
@Override
public boolean input(Instance instance) {
 if (getInputFormat() == null) {
  throw new IllegalStateException("No input instance format defined");
 }
 if (m_NewBatch) {
  resetQueue();
  m_NewBatch = false;
 }
 if (isFirstBatchDone()) {
  push(instance);
  return true;
 } else {
  bufferInput(instance);
  return false;
 }
}

/**
 * Signify that this batch of input to the filter is finished. Output() may
 * now be called to retrieve the filtered instances.
 * 
 * @return true if there are instances pending output
 * @throws IllegalStateException if no input structure has been defined
 */
@Override
public boolean batchFinished() {
 if (getInputFormat() == null) {
  throw new IllegalStateException("No input instance format defined");
 }
 // Push instances for output into output queue
 Instances toFilter = getInputFormat();
 int cutOff = (int) Math.round(toFilter.numInstances() * m_Percentage / 100);
 if (m_Inverse) {
  for (int i = 0; i < cutOff; i++) {
   push(toFilter.instance(i), false); // No need to copy
  }
 } else {
  for (int i = cutOff; i < toFilter.numInstances(); i++) {
   push(toFilter.instance(i), false); // No need to copy
  }
 }
 flushInput();
 m_NewBatch = true;
 m_FirstBatchDone = true;
 return (numPendingOutput() != 0);
}