001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.examples.group.utils.math;
020
021/**
022 * Abstract base class for {@link Vector} implementations.
023 * <p>
024 * The only methods to be implemented by subclasses are get, set and size.
025 */
026public abstract class AbstractVector extends AbstractImmutableVector implements Vector {
027
028  @Override
029  public abstract void set(int i, double v);
030
031
032  @Override
033  public void add(final Vector that) {
034    for (int index = 0; index < this.size(); ++index) {
035      this.set(index, this.get(index) + that.get(index));
036    }
037  }
038
039  @Override
040  public void multAdd(final double factor, final ImmutableVector that) {
041    for (int index = 0; index < this.size(); ++index) {
042      this.set(index, this.get(index) + factor * that.get(index));
043    }
044  }
045
046  @Override
047  public void scale(final double factor) {
048    for (int index = 0; index < this.size(); ++index) {
049      this.set(index, this.get(index) * factor);
050    }
051  }
052
053
054  @Override
055  public void normalize() {
056    final double factor = 1.0 / this.norm2();
057    this.scale(factor);
058  }
059
060
061}