/*
* Copyright 2011-2014, by Vladimir Kostyukov and Contributors.
*
* This file is part of la4j project (http://la4j.org)
*
* Licensed 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
*
* Contributor(s): -
*
*/
package org.la4j.operation.ooplace;
import org.la4j.operation.SymmetricVectorVectorOperation;
import org.la4j.Vector;
import org.la4j.iterator.VectorIterator;
import org.la4j.vector.DenseVector;
import org.la4j.vector.SparseVector;
public class OoPlaceVectorsAddition extends SymmetricVectorVectorOperation<Vector> {
@Override
public Vector apply(SparseVector a, SparseVector b) {
VectorIterator these = a.nonZeroIterator();
VectorIterator those = b.nonZeroIterator();
VectorIterator both = these.orElseAdd(those);
Vector result = a.blank();
while (both.hasNext()) {
double x = both.next();
int i = both.index();
result.set(i, x);
}
return result;
}
@Override
public Vector apply(DenseVector a, DenseVector b) {
Vector result = a.blank();
for (int i = 0; i < a.length(); i++) {
result.set(i, a.get(i) + b.get(i));
}
return result;
}
@Override
public Vector applySymmetric(DenseVector a, SparseVector b) {
Vector result = a.copy();
VectorIterator it = b.nonZeroIterator();
while (it.hasNext()) {
double x = it.next();
int i = it.index();
result.set(i, result.get(i) + x);
}
return result;
}
@Override
public void ensureApplicableTo(Vector a, Vector b) {
if (a.length() != b.length()) {
throw new IllegalArgumentException(
"Given vectors should have the same length: " +
a.length() + " does not equal to " + b.length() + "."
);
}
}
}