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/*
* Copyright (c) 2009-2018, Peter Abeles. All Rights Reserved.
*
* This file is part of Efficient Java Matrix Library (EJML).
*
* 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.
*/
package org.ejml.dense.row.linsol.svd;
import org.ejml.data.DMatrixRMaj;
import org.ejml.dense.row.CommonOps_DDRM;
import org.ejml.dense.row.SingularOps_DDRM;
import org.ejml.dense.row.factory.DecompositionFactory_DDRM;
import org.ejml.interfaces.SolveNullSpace;
import org.ejml.interfaces.decomposition.SingularValueDecomposition_F64;
/**
* @author Peter Abeles
*/
public class SolveNullSpaceSvd_DDRM implements SolveNullSpace {
boolean compact = true;
SingularValueDecomposition_F64 svd = DecompositionFactory_DDRM.svd(1,1,false,true,compact);
DMatrixRMaj V;
@Override
public boolean process(DMatrixRMaj input, int numberOfSingular, DMatrixRMaj nullspace) {
if( input.numCols > input.numRows ) {
if( compact ) {
svd = DecompositionFactory_DDRM.svd(1, 1, false, true, false);
compact = false;
}
} else {
if( !compact ) {
svd = DecompositionFactory_DDRM.svd(1, 1, false, true, true);
compact = true;
}
}
if( !svd.decompose(input))
return false;
double []singularValues = svd.getSingularValues();
V = svd.getV(V,false);
SingularOps_DDRM.descendingOrder(null,false,singularValues,svd.numberOfSingularValues(),V,false);
nullspace.reshape(V.numRows,numberOfSingular);
CommonOps_DDRM.extract(V,0,V.numRows,V.numCols-numberOfSingular,V.numCols,nullspace,0,0);
return true;
}
@Override
public boolean inputModified() {
return svd.inputModified();
}
public SingularValueDecomposition_F64 getSvd() {
return svd;
}
public double[] getSingularValues() {
return svd.getSingularValues();
}
}