org.ejml.dense.row.decomposition.BaseDecomposition_DDRB_to_DDRM Maven / Gradle / Ivy
/*
* Copyright (c) 2009-2017, 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.decomposition;
import org.ejml.data.DMatrixRBlock;
import org.ejml.data.DMatrixRMaj;
import org.ejml.dense.block.MatrixOps_DDRB;
import org.ejml.interfaces.decomposition.DecompositionInterface;
/**
* Generic interface for wrapping a {@link DMatrixRBlock} decomposition for
* processing of {@link DMatrixRMaj}.
*
* @author Peter Abeles
*/
public class BaseDecomposition_DDRB_to_DDRM implements DecompositionInterface {
protected DecompositionInterface alg;
protected double[]tmp;
protected DMatrixRBlock Ablock = new DMatrixRBlock();
protected int blockLength;
public BaseDecomposition_DDRB_to_DDRM(DecompositionInterface alg,
int blockLength) {
this.alg = alg;
this.blockLength = blockLength;
}
@Override
public boolean decompose(DMatrixRMaj A) {
Ablock.numRows = A.numRows;
Ablock.numCols = A.numCols;
Ablock.blockLength = blockLength;
Ablock.data = A.data;
int tmpLength = Math.min( Ablock.blockLength , A.numRows ) * A.numCols;
if( tmp == null || tmp.length < tmpLength )
tmp = new double[ tmpLength ];
// doing an in-place convert is much more memory efficient at the cost of a little
// but of CPU
MatrixOps_DDRB.convertRowToBlock(A.numRows,A.numCols,Ablock.blockLength,A.data,tmp);
boolean ret = alg.decompose(Ablock);
// convert it back to the normal format if it wouldn't have been modified
if( !alg.inputModified() ) {
MatrixOps_DDRB.convertBlockToRow(A.numRows,A.numCols,Ablock.blockLength,A.data,tmp);
}
return ret;
}
public void convertBlockToRow(int numRows , int numCols , int blockLength ,
double[] data) {
int tmpLength = Math.min( blockLength , numRows ) * numCols;
if( tmp == null || tmp.length < tmpLength )
tmp = new double[ tmpLength ];
MatrixOps_DDRB.convertBlockToRow(numRows,numCols,Ablock.blockLength,data,tmp);
}
@Override
public boolean inputModified() {
return alg.inputModified();
}
}