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Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
Represents one data instance.
public class Instance {

instance unique id
  public final int id;

attributes, except LABEL and IGNORED
  private final Vector attrs;

instance label code.
use Dataset.labels to get the real label value
  public final int label;
  public Instance(int idVector attrsint label) {
    this. = id;
    this. = attrs;
    this. = label;

Return the attribute at the specified position

index position of the attribute to retrieve
value of the attribute
  public double get(int index) {
    return .getQuick(index);

Set the value at the given index

value a double value to set
  public void set(int indexdouble value) {
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null || !(obj instanceof Instance))
      return false;
    Instance instance = (Instance)obj;
    return  == &&  == instance.label && .equals(instance.attrs);
  public int hashCode() {
    return  +  + .hashCode();
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