| /* |
| * 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 |
| * |
| * 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. |
| */ |
| package org.apache.commons.math4.fitting.leastsquares; |
| |
| import org.apache.commons.math4.fitting.leastsquares.LeastSquaresProblem.Evaluation; |
| import org.apache.commons.math4.linear.RealMatrix; |
| import org.apache.commons.math4.linear.RealVector; |
| |
| /** |
| * Applies a dense weight matrix to an evaluation. |
| * |
| * @since 3.3 |
| */ |
| class DenseWeightedEvaluation extends AbstractEvaluation { |
| |
| /** the unweighted evaluation */ |
| private final Evaluation unweighted; |
| /** reference to the weight square root matrix */ |
| private final RealMatrix weightSqrt; |
| |
| /** |
| * Create a weighted evaluation from an unweighted one. |
| * |
| * @param unweighted the evaluation before weights are applied |
| * @param weightSqrt the matrix square root of the weight matrix |
| */ |
| DenseWeightedEvaluation(final Evaluation unweighted, |
| final RealMatrix weightSqrt) { |
| // weight square root is square, nR=nC=number of observations |
| super(weightSqrt.getColumnDimension()); |
| this.unweighted = unweighted; |
| this.weightSqrt = weightSqrt; |
| } |
| |
| /* apply weights */ |
| |
| /** {@inheritDoc} */ |
| @Override |
| public RealMatrix getJacobian() { |
| return weightSqrt.multiply(this.unweighted.getJacobian()); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public RealVector getResiduals() { |
| return this.weightSqrt.operate(this.unweighted.getResiduals()); |
| } |
| |
| /* delegate */ |
| |
| /** {@inheritDoc} */ |
| @Override |
| public RealVector getPoint() { |
| return unweighted.getPoint(); |
| } |
| |
| } |