How to use

getInputFormat

method

in

weka.filters.unsupervised.attribute.Center

/**
 * Input an instance for filtering. Filter requires all
 * training 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.
 */
public boolean input(Instance instance) {
 if (getInputFormat() == null)
  throw new IllegalStateException("No input instance format defined");
 if (m_NewBatch) {
  resetQueue();
  m_NewBatch = false;
 }
 
 if (m_Means == null) {
  bufferInput(instance);
  return false;
 } 
 else {
  convertInstance(instance);
  return true;
 }
}

/**
 * Input an instance for filtering. Filter requires all
 * training 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.
 */
public boolean input(Instance instance) {
 if (getInputFormat() == null)
  throw new IllegalStateException("No input instance format defined");
 if (m_NewBatch) {
  resetQueue();
  m_NewBatch = false;
 }
 
 if (m_Means == null) {
  bufferInput(instance);
  return false;
 } 
 else {
  convertInstance(instance);
  return true;
 }
}

/**
 * Signify that this batch of input to the filter is finished. 
 * If the filter requires all instances prior to filtering,
 * 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
 */
public boolean batchFinished() {
 if (getInputFormat() == null)
  throw new IllegalStateException("No input instance format defined");
 if (m_Means == null) {
  Instances input = getInputFormat();
  m_Means = new double[input.numAttributes()];
  for (int i = 0; i < input.numAttributes(); i++) {
   if (input.attribute(i).isNumeric() &&
       (input.classIndex() != i)) {
    m_Means[i] = input.meanOrMode(i);
   }
  }
  // Convert pending input instances
  for (int i = 0; i < input.numInstances(); i++)
   convertInstance(input.instance(i));
 }
 // Free memory
 flushInput();
 m_NewBatch = true;
 return (numPendingOutput() != 0);
}

/**
 * Signify that this batch of input to the filter is finished. 
 * If the filter requires all instances prior to filtering,
 * 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
 */
public boolean batchFinished() {
 if (getInputFormat() == null)
  throw new IllegalStateException("No input instance format defined");
 if (m_Means == null) {
  Instances input = getInputFormat();
  m_Means = new double[input.numAttributes()];
  for (int i = 0; i < input.numAttributes(); i++) {
   if (input.attribute(i).isNumeric() &&
       (input.classIndex() != i)) {
    m_Means[i] = input.meanOrMode(i);
   }
  }
  // Convert pending input instances
  for (int i = 0; i < input.numInstances(); i++)
   convertInstance(input.instance(i));
 }
 // Free memory
 flushInput();
 m_NewBatch = true;
 return (numPendingOutput() != 0);
}

  if (instance.attribute(j).isNumeric() &&
      (!Utils.isMissingValue(vals[j])) &&
      (getInputFormat().classIndex() != j)) {
} else {
 double[] vals = instance.toDoubleArray();
 for (int j = 0; j < getInputFormat().numAttributes(); j++) {
  if (instance.attribute(j).isNumeric() &&
      (!Utils.isMissingValue(vals[j])) &&
      (getInputFormat().classIndex() != j)) {
   vals[j] = (vals[j] - m_Means[j]);

  if (instance.attribute(j).isNumeric() &&
      (!Utils.isMissingValue(vals[j])) &&
      (getInputFormat().classIndex() != j)) {
} else {
 double[] vals = instance.toDoubleArray();
 for (int j = 0; j < getInputFormat().numAttributes(); j++) {
  if (instance.attribute(j).isNumeric() &&
      (!Utils.isMissingValue(vals[j])) &&
      (getInputFormat().classIndex() != j)) {
   vals[j] = (vals[j] - m_Means[j]);