/*
* 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.inplace;
import org.la4j.iterator.MatrixIterator;
import org.la4j.Matrix;
import org.la4j.matrix.DenseMatrix;
import org.la4j.operation.SimpleMatrixMatrixOperation;
import org.la4j.matrix.ColumnMajorSparseMatrix;
import org.la4j.matrix.RowMajorSparseMatrix;
import org.la4j.matrix.SparseMatrix;
public class InPlaceCopyMatrixToMatrix extends SimpleMatrixMatrixOperation<Matrix> {
@Override
public Matrix applySimple(DenseMatrix a, SparseMatrix b) {
MatrixIterator it = b.iterator();
while (it.hasNext()) {
it.next();
int i = it.rowIndex();
int j = it.columnIndex();
double x = a.get(i, j);
if (x != 0.0) {
it.set(x);
}
}
return b;
}
@Override
public Matrix applySimple(SparseMatrix a, DenseMatrix b) {
return fromSparseToMatrix(a, b);
}
@Override
public Matrix applySimple(SparseMatrix a, SparseMatrix b) {
return fromSparseToMatrix(a, b);
}
@Override
public Matrix apply(DenseMatrix a, DenseMatrix b) {
for (int i = 0; i < a.rows(); i++) {
for (int j = 0; j < a.columns(); j++) {
b.set(i, j, a.get(i, j));
}
}
return b;
}
@Override
public Matrix apply(RowMajorSparseMatrix a, ColumnMajorSparseMatrix b) {
return fromSparseToMatrix(a, b);
}
@Override
public Matrix apply(ColumnMajorSparseMatrix a, RowMajorSparseMatrix b) {
return fromSparseToMatrix(a, b);
}
private Matrix fromSparseToMatrix(SparseMatrix a, Matrix b) {
MatrixIterator it = a.nonZeroIterator();
while (it.hasNext()) {
double x = it.next();
int i = it.rowIndex();
int j = it.columnIndex();
b.set(i, j, x);
}
return b;
}
}